4162:(c) Convention and abbreviations. – The age of a stratigraphic unit or the time of a geologic event, as commonly determined by numerical dating or by reference to a calibrated time-scale, may be expressed in years before the present. The unit of time is the modern year as presently recognized worldwide. Recommended (but not mandatory) abbreviations for such ages are SI (International System of Units) multipliers coupled with "a" for annus: ka, Ma, and Ga for kilo-annus (10 years), Mega-annus (10 years), and Giga-annus (10 years), respectively. Use of these terms after the age value follows the convention established in the field of C-14 dating. The "present" refers to AD 1950, and such qualifiers as "ago" or "before the present" are omitted after the value because measurement of the duration from the present to the past is implicit in the designation. In contrast, the duration of a remote interval of geologic time, as a number of years, should not be expressed by the same symbols. Abbreviations for numbers of years, without reference to the present, are informal (e.g., y or yr for years; my, m.y., or m.yr. for millions of years; and so forth, as preference dictates). For example, boundaries of the Late Cretaceous Epoch currently are calibrated at 63 Ma and 96 Ma, but the interval of time represented by this epoch is 33 m.y.
1637:, and the apsides move in the other direction because of the long-term effects of gravitational pull by the other planets. Since the speed of the Earth varies according to its position in its orbit as measured from its perihelion, Earth's speed when in a solstice or equinox point changes over time: if such a point moves toward perihelion, the interval between two passages decreases a little from year to year; if the point moves towards aphelion, that period increases a little from year to year. So a "tropical year" measured from one passage of the northward ("vernal") equinox to the next, differs from the one measured between passages of the southward ("autumnal") equinox. The average over the full orbit does not change because of this, so the length of the average tropical year does not change because of this second-order effect.
5493:
6085:
42:
5487:
6133:
6073:
5268:
1571:
2388:. The joint document says that definitions such as the Julian year "bear an inherent, pre-programmed obsolescence because of the variability of Earth's orbital movement", but then proposes using the length of the tropical year as of 2000 AD (specified down to the millisecond), which suffers from the same problem. (The tropical year oscillates with time by more than a minute.)
5278:
6097:
6121:
6109:
2070:). Note however that in absolute time the average Gregorian year is not adequately defined unless the period of the averaging (start and end dates) is stated, because each period of 400 years is longer (by more than 1000 seconds) than the preceding one as the rotation of the Earth slows. In this calendar, a common year is 365 days (
1226:, this year is about 20 minutes shorter than the sidereal year. The mean tropical year is approximately 365 days, 5 hours, 48 minutes, 45 seconds, using the modern definition ( = 365.24219 d × 86 400 s). The length of the tropical year varies a bit over thousands of years because the rate of axial precession is not constant.
1647:
between the Earth and the Moon and Sun increases the length of the day and of the month (by transferring angular momentum from the rotation of the Earth to the revolution of the Moon); since the apparent mean solar day is the unit with which we measure the length of the year in civil life, the length
2183:
A seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, the flowering of a species of plant, the first frost, or the first scheduled game of a certain sport. All of these events can have wide variations of
912:
or financial year is a 12-month period used for calculating annual financial statements in businesses and other organizations. In many jurisdictions, regulations regarding accounting require such reports once per twelve months, but do not require that the twelve months constitute a calendar year.
1068:
ephemeris days are used in astronomical calculations. Fundamentally, expressing a time interval in Julian years is a way to precisely specify an amount of time (not how many "real" years), for long time intervals where stating the number of ephemeris days would be unwieldy and unintuitive. By
2391:
The notation has proved controversial as it conflicts with an earlier convention among geoscientists to use "a" specifically for "years ago" (e.g. 1 Ma for 1 million years ago), and "y" or "yr" for a one-year time period. However, this historical practice does not comply with the NIST
1375:
is also essentially lunar, except that an intercalary lunar month is added once every two or three years, in order to keep the calendar synchronized with the solar cycle as well. Thus, a lunar year on the Jewish (Hebrew) calendar consists of either twelve or thirteen lunar months.
1640:
Each planet's movement is perturbed by the gravity of every other planet. This leads to short-term fluctuations in its speed, and therefore its period from year to year. Moreover, it causes long-term changes in its orbit, and therefore also long-term changes in these
977:
in the United States), roughly coinciding with autumn, winter, and spring. At some, a shortened summer session, sometimes considered part of the regular academic year, is attended by students on a voluntary or elective basis. Other schools break the year into
3156:
1020:
Schools and universities in
Australia typically have academic years that roughly align with the calendar year (i.e., starting in February or March and ending in October to December), as the southern hemisphere experiences summer from December to February.
962:, such as semesters or quarters. The school year in many countries starts in August or September and ends in May, June or July. In Israel the academic year begins around October or November, aligned with the second month of the Hebrew calendar.
1013:
There are typically 180 days of teaching each year in schools in the US, excluding weekends and breaks, while there are 190 days for pupils in state schools in Canada, New
Zealand and the United Kingdom, and 200 for pupils in Australia.
982:
main semesters, a first (typically August through
December) and a second semester (January through May). Each of these main semesters may be split in half by mid-term exams, and each of the halves is referred to as a
1509:
is a tropical year that starts when the (fictitious) mean Sun reaches an ecliptic longitude of 280°. This is currently on or close to
January 1. It is named after the 19th-century German astronomer and mathematician
1241:, where the Earth is farthest from the Sun. The anomalistic year is usually defined as the time between perihelion passages. Its average duration is 365.259636 days (365 d 6 h 13 min 52.6 s) (at the epoch J2011.0).
1222:. The modern definition of mean tropical year differs from the actual time between passages of, e.g., the northward equinox, by a minute or two, for several reasons explained below. Because of the Earth's
2507:
analysis is used as the primary method for age determination. If age is determined primarily by radiocarbon dating, then the age should be expressed in either radiocarbon or calendar (calibrated) years
2672:, combined with prefixes for thousand, million, or billion. In archaeology, dealing with more recent periods, normally expressed dates, e.g. "10,000 BC", may be used as a more traditional form than
1017:
In India the academic year normally starts from June 1 and ends on May 31. Though schools start closing from mid-March, the actual academic closure is on May 31 and in Nepal it starts from July 15.
3414:
Simon, J.L.; Bretagnon, P.; Chapront, J.; Chapront-Touzé, M.; Francou, G.; Laskar, J. (February 1994). "Numerical expressions for precession formulae and mean elements for the Moon and planets".
1214:
of the Sun to increase by 360 degrees. Since the Sun's ecliptic longitude is measured with respect to the equinox, the tropical year comprises a complete cycle of the seasons and is the basis of
1662:
Mean year lengths in this section are calculated for 2000, and differences in year lengths, compared to 2000, are given for past and future years. In the tables a day is 86,400 SI seconds long.
601:, the average (mean) length of a year is 365.25 days. In a non-leap year, there are 365 days, in a leap year there are 366 days. A leap year occurs every fourth year during which a leap day is
3487:
Tabulates length of tropical year from −500 to 2000 at 500 year intervals using a formula by Laskar (1986); agrees closely with values in this section near 2000, departs by 6 seconds in −500.
5391:
5314:
196:. For the Gregorian calendar, the average length of the calendar year (the mean year) across the complete leap cycle of 400 years is 365.2425 days (97 out of 400 years are leap years).
2310:(IAU) recognizes the symbol "a" rather than "yr" for a year, notes the different kinds of year, and recommends adopting the Julian year of 365.25 days, unless otherwise specified (IAU
2535:. In astronomical applications, the year used is the Julian year of precisely 365.25 days. In geology and paleontology, the year is not so precise and varies depending on the author.
3457:
Values in tables agree closely for 2000, and depart by as much as 44 seconds for the years furthest in the past or future; the expressions are simpler than those recommended in the
1633:
The positions of the equinox and solstice points with respect to the apsides of Earth's orbit change: the equinoxes and solstices move westward relative to the stars because of
928:
it runs from April 1 for purposes of corporation tax and government financial statements, but from April 6 for purposes of personal taxation and payment of state benefits; in
1255:
The draconic year, draconitic year, eclipse year, or ecliptic year is the time taken for the Sun (as seen from the Earth) to complete one revolution with respect to the same
2400:
being measured (in this case, time intervals or points in time) with the units and also the unnaceptability of using abbreviations for units. Furthermore, according to the
1390:
or wandering year, is an integral approximation to the year equaling 365 days, which wanders in relation to more exact years. Typically the vague year is divided into 12
2329:
3656:
2318:
1081:
77:. Generally, a year is taken to mean a calendar year, but the word is also used for periods loosely associated with the calendar or astronomical year, such as the
2430:, etc. The exponents and exponential notations are typically used for calculating and in displaying calculations, and for conserving space, as in tables of data.
2207:
1263:: these occur only when both the Sun and the Moon are near these nodes; so eclipses occur within about a month of every half eclipse year. Hence there are two
3814:
E.R. Cohen, T. Cvitas, J.G. Frey, B. Holmström, K. Kuchitsu, R. Marquardt, I. Mills, F. Pavese, M. Quack, J. Stohner, H.L. Strauss, M. Takami, and A.J. Thor,
5307:
3825:
2584:
An extremely long unit of time, about 70 times as long as the age of the universe. It is the same order of magnitude as the expected life span of a small
2349:
1085:
2241:" (thousands, millions, and billions of years, respectively) and similar abbreviations are used to denote intervals of time remote from the present. In
2338:
also uses the same symbol "a", notes the difference between
Gregorian year and Julian year, and adopts the former (a=365.2425 days), also noted in the
5845:
553:
In some languages, it is common to count years by referencing to one season, as in "summers", or "winters", or "harvests". Examples include
Chinese
299:
5300:
4877:
4713:
937:
4342:
4303:
4276:
4042:
3480:
3450:
3188:
5814:
3284:
3175:
3754:
3295:
650:
days (relative error of 9·10). In the year 2800 CE, the
Gregorian and Revised Julian calendars will begin to differ by one calendar day.
2957:
distinction between "absolute" time and time intervals is somewhat controversial amongst members of the
Geological Society of America.
3563:
35:
2143:, or equinoctial cycle, corresponds to a complete revolution of the equinoxes around the ecliptic. Its length is about 25,700 years.
5565:
2249:
1610:
1482:
is the sidereal year for a planet of negligible mass (relative to the Sun) and unperturbed by other planets that is governed by the
1077:
3799:
3251:
3054:
2307:
569:
563:
229:
4827:
4482:
1483:
5638:
4706:
3660:
2178:
1592:
2865:
2622:
without a multiplier prefix, but context will normally be sufficient to distinguish long time periods from pressure values.
1359:
comprises twelve full cycles of the phases of the Moon, as seen from Earth. It has a duration of approximately 354.37 days.
3866:"IUPAC-IUGS common definition and convention on the use of the year as a derived unit of time (IUPAC Recommendations 2011)"
5819:
3621:
3368:
3348:
773:
6063:
4789:
3922:
1898:, which are slowly getting longer (at a rate that cannot be exactly predicted in advance) and are now around 86,400.002
1223:
1160:
403:
4174:
Clement, Bradford M. (April 8, 2004). "Dependence of the duration of geomagnetic polarity reversals on site latitude".
3322:
5774:
5754:
5700:
5585:
5421:
5080:
2967:
1447:
1395:
816:
602:
586:
748:
with an irregular pattern of leap days based on observation (or astronomical computation), aiming to place new year (
4992:
5441:
5426:
5364:
5343:
4432:
4412:
4225:
3873:
3007:
2417:
1581:
1046:
The Julian year, as used in astronomy and other sciences, is a time unit defined as exactly 365.25 days of 86,400
5595:
5406:
5143:
4872:
4422:
4335:
3970:"Letters About the IUPAC-IUGS Common Definition and Convention on the Use of the Year as a Derived Unit of Time"
2352:
jointly recommended defining the "annus", with symbol "a", as the length of the tropical year in the year 2000:
4842:
2949:
Use of "mya" and "bya" is deprecated in modern geophysics, the recommended usage being "Ma" and "Ga" for dates
3823:
3388:. Washington and Taunton: U.S. Government Printing Office and the U.K. Hydrographic Office. 2008. p. B3.
1054:"). This is the normal meaning of the unit "year" used in various scientific contexts. The Julian century of
5855:
5633:
5535:
5451:
5446:
5098:
4749:
3845:. Research Triangle Park, NC: International Union of Pure and Applied Chemistry (IUPAC). February 24, 2014.
3161:
Gregorian Reform of the
Calendar: Proceedings of the Vatican Conference to Commemorate its 400th Anniversary
2811:
1041:
955:
725:
on an observational basis. Lunisolar calendars have mostly fallen out of use except for liturgical reasons (
633:
629:
609:
256:
4025:, in Gargaud, Muriel; Amils, Ricardo; Quintanilla, José Cernicharo; Cleaves, Henderson James (Jim) (eds.),
6153:
4452:
3352:
2578:
2500:
1415:
236:
305:"year, season". Cognates also descended from the same Proto-Indo-European noun (with variation in suffix
6008:
4913:
4858:
4812:
4797:
4442:
2778:
2401:
1588:
812:
6084:
2217:
In
English, the abbreviations "y" or "yr" are more commonly used in non-scientific literature. In some
287:
41:
5835:
5749:
5575:
5436:
5164:
5133:
4582:
4477:
4328:
4264:
4183:
4122:
4075:
3936:
3698:
3510:
3423:
3137:
2821:
2816:
1649:
1007:
741:
585:
number of days or lunar months. Any calendar that follows an astronomical year must have a system of
1229:
The anomalistic year is the time taken for the Earth to complete one revolution with respect to its
561:, an ideographic compound of a person carrying a bundle of wheat denoting "harvest". Slavic besides
6045:
5840:
5695:
5560:
5512:
5381:
5038:
4497:
4457:
3864:
Holden, Norman E.; Bonardi, Mauro L.; De Bièvre, Paul; Renne, Paul R. & Villa, Igor M. (2011).
3080:
2875:
2562:
2548:
2532:
1648:
of the year appears to decrease. The rotation rate of the Earth is also changed by factors such as
1624:
999:
336:
292:
216:, year) is sometimes used in scientific literature, though its exact duration may be inconsistent.
62:
3969:
6125:
6089:
6020:
5794:
5718:
5648:
4987:
4965:
4832:
4656:
4627:
4562:
4555:
4207:
4138:
4112:
3900:
3399:
U.S. Naval Observatory Nautical Almanac Office and Her Majesty's Nautical Almanac Office (2010).
2554:
2488:
1399:
1219:
1211:
1030:
804:
716:
659:
181:
46:
1321:
is the time for the Sun (as seen from the Earth) to complete one revolution with respect to the
1288:, that is the period of a complete revolution of the Moon's ascending node around the ecliptic:
674:. Because 97 out of 400 years are leap years, the mean length of the Gregorian calendar year is
4157:
3686:
3538:
3280:
3194:
3044:
Applied to a very long period or cycle (in chronology or mythology, or vaguely in poetic use)."
1486:. Such a planet would be slightly closer to the Sun than Earth's mean distance. Its length is:
176:
is an approximation of the number of days of the Earth's orbital period, as counted in a given
49:
planets' orbit around the Sun. The duration of the year is the time taken to go around the Sun.
5868:
5733:
5550:
5068:
4947:
4847:
4700:
4603:
4507:
4309:
4299:
4282:
4272:
4199:
4038:
3865:
3752:
3476:
3446:
3291:
3184:
2992:
2397:
2385:
1411:
1403:
855:
795:. Two notations are used to indicate year numbering in the Gregorian calendar: the Christian "
792:
788:
682:
663:
5281:
3103:
2245:
the abbreviations kyr, Myr and Gyr are in common use for kiloyears, megayears and gigayears.
991:
in some countries). There may also be a voluntary summer session or a short January session.
6101:
6013:
5759:
5738:
5690:
5653:
5466:
5186:
5174:
5002:
4970:
4802:
4671:
4587:
4577:
4492:
4191:
4130:
4083:
4030:
3944:
3890:
3882:
3846:
3771:
3725:"General Instructions - Monthly Notices of the Royal Astronomical Society - Oxford Academic"
3724:
3706:
3518:
3514:
3427:
2558:
2496:
2484:
2333:
2252:(UCUM) disambiguates the varying symbologies of ISO 1000, ISO 2955 and ANSI X3.50 by using:
1550:
1511:
1407:
1285:
1204:
891:
240:
125:
3574:
3497:
Laskar, J.; Robutel, P.; Joutel, F.; Gastineau, M.; Correia, A. C. M.; Levrard, B. (2004).
2664:
In geology and paleontology, a distinction sometimes is made between abbreviation "yr" for
5744:
5723:
5555:
5527:
5248:
5113:
5090:
5058:
5010:
4997:
4960:
4942:
4572:
4567:
3829:
3803:
3758:
3372:
3255:
2422:
For the following, there are alternative forms that elide the consecutive vowels, such as
2339:
2160:
1506:
1435:
1372:
1364:
1318:
1250:
851:
833:
803:", abbreviated CE, preferred by many of other faiths and none. Year numbers are based on
737:
726:
598:
371:
283:
269:
262:
193:
129:
4268:
4187:
4126:
4079:
3940:
3702:
3141:
1514:. The following equation can be used to compute the current Besselian epoch (in years):
6158:
6137:
6077:
6040:
5799:
5789:
5728:
5685:
5517:
5507:
5476:
5376:
5348:
5191:
5181:
4980:
4852:
4822:
4807:
4592:
4550:
4545:
4417:
4257:
3604:"Special Publication 811 – Guide for the Use of the International System of Units (SI)"
2950:
2673:
2659:
2509:
2322:
2286:
2218:
2019:
1940:
1653:
1554:
1419:
1264:
1215:
925:
875:
784:
745:
730:
454:
361:
247:
209:
117:
89:, etc. The term can also be used in reference to any long period or cycle, such as the
3948:
3796:
3248:
1259:(a point where the Moon's orbit intersects the ecliptic). The year is associated with
6147:
5927:
5878:
5863:
5809:
5580:
5416:
5411:
5327:
5271:
5221:
5169:
5103:
5075:
5063:
5053:
5043:
4925:
4769:
4695:
4644:
4597:
4512:
4472:
4467:
4462:
4395:
3927:
2997:
2759:
2619:
2377:
2172:
2152:
1707:
1688:
1479:
1439:
1154:
1150:
1051:
959:
949:
933:
808:
753:
686:
671:
667:
317:
173:
86:
78:
3904:
1233:. The orbit of the Earth is elliptical; the extreme points, called apsides, are the
1173:
The sidereal year is the time taken for the Earth to complete one revolution of its
1069:
convention, the Julian year is used in the computation of the distance covered by a
6132:
6113:
6072:
6025:
5912:
5907:
5902:
5889:
5628:
5243:
5237:
4903:
4837:
4759:
4690:
4639:
4487:
4427:
4211:
4142:
4103:
4066:
3795:
IUPAP Red Book: Symbols, Units, Nomenclature and Fundamental Constants in Physics.
3012:
2871:
2805:
2642:
2466:
2226:
2197:
2156:
1459:
965:
Some schools in the UK, Canada and the United States divide the academic year into
869:
827:
769:
617:
205:
4034:
1764:(seconds; positive when length for tabulated year is greater than length in 2000)
807:, so that there is no "year zero". Years before the epoch are abbreviated BC for
479:
5292:
3523:
3498:
1549:
The TT subscript indicates that for this formula, the Julian date should use the
1177:, as measured against a fixed frame of reference (such as the fixed stars, Latin
152:
regions, several geographical sectors do not present defined seasons; but in the
6035:
6030:
5675:
5658:
5590:
5570:
5456:
5338:
5253:
5231:
5138:
5123:
4918:
4898:
4888:
4817:
4774:
4754:
4683:
4502:
4404:
4022:
2635:
2615:
2481:
2473:
1936:
1570:
909:
903:
879:
796:
491:
185:
82:
4134:
4087:
3822:, Third Edition, Second Printing, IUPAC & RSC Publishing, Cambridge (2008)
3629:
3365:
6050:
6003:
5987:
5873:
5779:
5600:
5461:
5431:
5369:
5148:
5048:
4955:
4930:
4733:
4517:
4101:
F.A. Danevich; et al. (2003). "α activity of natural tungsten isotopes".
3266:
Richards, E.G. (2013). Calendars. In S.E. Urban & P.K. Seidelmann (Eds.),
3183:(3rd ed.). Mill Valley, CA: University Science Books. pp. 585, 590.
3002:
2462:
2140:
1644:
1634:
1391:
1356:
1256:
1234:
1070:
859:
845:
800:
722:
484:
385:
161:
157:
149:
113:
97:
90:
4313:
3886:
3603:
3174:
Richards, E.G. (2013). "Calendars". In Urban, S.E.; Seidelmann, P.K. (eds.).
1325:
of the Moon's orbit. This period is associated with the apparent size of the
605:
into the month of February. The name "Leap Day" is applied to the added day.
5947:
5784:
5668:
5643:
5623:
5540:
5492:
5486:
5471:
5211:
5128:
4764:
4676:
4651:
4632:
4522:
4286:
3850:
3738:
3314:
2921:
2608:
2585:
2242:
2015:
1895:
1326:
1284:
This term is sometimes erroneously used for the draconic or nodal period of
929:
636:, has 218 leap years every 900 years, for the average (mean) year length of
276:
189:
121:
4203:
3499:"A long-term numerical solution for the insolation quantities of the Earth"
2404:(UKMA), language-independent symbols are more universally understood (UKMA
1210:
Today the mean tropical year is defined as the period of time for the mean
464:"thou goest, wanderest"). A number of English words are derived from Latin
3128:
Shields, Miriam Nancy (1924). "The new calendar of the eastern churches".
534:
526:
518:
475:
5982:
5962:
5804:
5710:
5610:
5401:
5396:
4779:
4540:
4532:
4390:
4380:
3685:
North American Commission on Stratigraphic Nomenclature (November 2005).
2987:
2932:
2882:
2860:
2492:
2477:
2458:
1462:
is the heliacal year, the interval between heliacal risings, of the star
1443:
1423:
1238:
820:
776:
to each sequential year, using a reference event in the past (called the
514:
399:
381:
177:
109:
17:
4229:
4195:
4117:
3751:
G.A. Wilkins, Comm. 5, "IAU Style Manual", IAU Transactions XXB (1989),
3710:
954:
An academic year is the annual period during which a student attends an
620:), totaling exactly 31,557,600 seconds in the Julian astronomical year.
471:
5977:
5967:
5897:
5769:
5680:
5545:
5118:
5108:
5030:
5021:
5006:
4908:
4893:
4738:
4661:
4370:
3895:
2972:
2612:
2525:
2396:, considering the unacceptability of mixing information concerning the
2299:
2222:
1992:
1956:
1595: in this section. Unsourced material may be challenged and removed.
1368:
1360:
1322:
1260:
1200:
1006:
marking periods. Some state in defense of this that there is perhaps a
582:
310:
153:
145:
105:
1346:
days (411 days 18 hours 49 minutes 35 seconds) (at the epoch J2000.0).
558:
554:
5972:
5922:
5917:
5216:
4375:
3475:. Sean E. Urban (ed.) (3 ed.). Univ Science Books. p. 587.
3222:
2977:
2601:
2067:
2054:
1899:
1463:
1131:
1109:
1047:
917:
863:
757:
749:
613:
395:
306:
208:
for year is commonly abbreviated as "y" or "yr". The symbol "a" (for
141:
137:
133:
101:
4263:(illustrated ed.). Amherst: University of Massachusetts Press.
6108:
3995:
5952:
5764:
5663:
5618:
5226:
4975:
4666:
4622:
4614:
3609:. National Institute of Standards and Technology (NIST). para 8.1.
3247:
International Earth Rotation and Reference System Service. (2010).
2982:
2927:
2504:
2384:
This differs from the above definition of 365.25 days by about 20
2185:
1470:
and its duration is very close to the Julian year of 365.25 days.
1330:
1230:
1174:
921:
777:
355:
343:
128:
regions around the planet, four seasons are generally recognized:
70:
66:
40:
3539:"Precession of the Earth's Axis - Wolfram Demonstrations Project"
3321:. United States Naval Observatory. c. 2022. s.v. year, tropical.
2112:
seconds). The 400-year civil cycle of the Gregorian calendar has
1955:
Tropical, also called solar, averaged and then rounded for epoch
612:
is a unit of time defined as 365.25 days, each of exactly 86,400
445:, would then be derived from verbal roots meaning "to go, move",
5942:
5932:
5386:
5323:
4365:
4351:
4064:
P. Belli; et al. (2007). "Investigation of β decay of Cd".
2561:
occurred approximately 4.54 Ga (4.54 billion years) ago and the
2321:(IUPAP) notes "a" as the general symbol for the time unit year (
2043:
2032:
1267:
every eclipse year. The average duration of the eclipse year is
839:
332:
184:, or modern calendar, presents its calendar year to be either a
58:
5296:
4324:
3659:. American Geophysical Union. September 1, 2017. Archived from
3443:
Celestial Mechanics: A Computational Guide for the Practitioner
3403:. Washington: U.S. Government Printing Office. pp. C2, L8.
5937:
3270:(3rd ed.). Mill Valley, CA: University Science Books. p. 586.
3157:"The Papal Bull of 1582 Promulgating a Reform of the Calendar"
3037:
2735:
2715:
2293:
In the UCUM, the symbol "a", without any qualifier, equals 1 a
2238:
2234:
2230:
2028:
1564:
1467:
994:
Some other schools, including some in the United States, have
74:
666:
falls on or shortly before March 21 and hence it follows the
500:
326:
320:
3163:. Vatican City: Pontifical Academy of Sciences. p. 223.
2618:
is about 8 Pa. This symbol coincides with that for the
1629:
The exact length of an astronomical year changes over time.
998:
marking periods. Some schools in the United States, notably
799:" (meaning "in the year of the Lord"), abbreviated AD; and "
760:), as opposed to using an algorithmic system of leap years.
2212:
Guide for the Use of the International System of Units (SI)
2035:, and if an hour is defined as one twenty-fourth of a day,
783:
The Gregorian calendar era is the world's most widely used
5392:
International Earth Rotation and Reference Systems Service
1371:. A Muslim calendar year is based on the lunar cycle. The
4156:
North American Commission on Stratigraphic Nomenclature.
3691:
The American Association of Petroleum Geologists Bulletin
3573:. Oak Ridge Associated Universities. 2009. Archived from
2007:
Anomalistic, averaged and then rounded for epoch J2011.0
2214:
supports the symbol "a" as the unit of time for a year.
823:
designates 1 BC/BCE, −1 designates 2 BC/BCE, and so on.
4320:
1968:
Gregorian, solar days averaged over the 400-year cycle
1159:
The relations among these are considered more fully in
429:, there is evidence for an original derivation with an
3741:. The American Astronomical Society. November 3, 2022.
1894:
Some of the year lengths in this table are in average
1092:(without subscript) always refers to the Julian year,
721:
Historically, lunisolar calendars intercalated entire
532:"yearling (calf)", the latter also reflected in Latin
6061:
2027:
An average Gregorian year may be said to be 365.2425
1978:
Julian, solar days averaged over the four-year cycle
1280:
days (346 d 14 h 52 min 54 s) (at the epoch J2000.0).
643:
days, close to the length of the mean tropical year,
4158:"North American Stratigraphic Code (Article 13 (c))"
3159:. In G. V. Coyne; M. A. Hoskin; O. Pedersen (eds.).
1426:. It is still used by many Zoroastrian communities.
819:, positive numbers indicate years AD/CE, the number
408:
297:
5996:
5887:
5854:
5828:
5709:
5609:
5526:
5500:
5357:
5204:
5157:
5089:
5029:
5019:
4941:
4868:
4788:
4729:
4613:
4531:
4441:
4403:
4389:
4358:
3816:
Quantities, Units and Symbols in Physical Chemistry
3797:
https://iupap.org/wp-content/uploads/2021/03/A4.pdf
1760:
1664:
1166:Each of these three years can be loosely called an
1010:between report frequency and academic achievement.
425:Although most languages treat the word as thematic
4256:
3473:Explanatory Supplement to the Astronomical Almanac
3268:Explanatory Supplement to the Astronomical Almanac
3177:Explanatory Supplement to the Astronomical Almanac
2303:, a unit of area, by using the abbreviation "ar".
1398:days. The vague year was used in the calendars of
1367:and for marking the start of the fasting month of
890:Financial and scientific calculations often use a
685:(8·10) relative to the current length of the mean
73:is the time taken for Earth to revolve around the
3974:Chemistry International -- Newsmagazine for IUPAC
2330:International Union of Pure and Applied Chemistry
1237:, where the Earth is closest to the Sun, and the
3445:. New York: John Wiley & Sons. p. 103.
2163:. It comprises roughly 230 million Earth years.
34:"12 months" redirects here. For other uses, see
4228:. Geological Society of America. Archived from
2953:, but "m.y." for the durations of epochs. This
2319:International Union of Pure and Applied Physics
1561:Variation in the length of the year and the day
1082:International Union of Pure and Applied Physics
100:, the course of a year sees the passing of the
3628:. University of North Carolina. Archived from
3626:How Many? A Dictionary of Units of Measurement
2208:National Institute of Standards and Technology
1141:may be applied to it to form "ka", "Ma", etc.
5308:
4336:
4029:, Berlin, Heidelberg: Springer, p. 621,
3916:
3914:
8:
3843:The IUPAC Compendium of Chemical Terminology
3727:. Oxford University Press. November 3, 2022.
1434:A heliacal year is the interval between the
1329:, and also with the varying duration of the
1199:days (365 d 6 h 9 min 9.76 s) (at the epoch
1061:ephemeris days and the Julian millennium of
3697:(11) (Article 13 (c) ed.): 1547–1591.
3657:"AGU publications: Grammar and Style Guide"
3651:
3649:
3647:
3602:Thompson, Ambler; Taylor, Barry N. (2008).
3061:. National Aeronautics Space Administration
2201:
1385:
1184:
1178:
867:
843:
831:
489:
465:
389:
375:
365:
353:
5315:
5301:
5293:
5026:
4400:
4343:
4329:
4321:
3564:"Science Bowl Questions, Astronomy, Set 2"
2350:International Union of Geological Sciences
1904:
1333:. The duration of one full moon cycle is:
1138:
1086:International Union of Geological Sciences
924:the fiscal year runs from April 1; in the
513:"year", also preserved in this meaning in
331:) "year, season, period of time" (whence "
4116:
3894:
3522:
2297:. The UCUM also minimizes confusion with
1611:Learn how and when to remove this message
1145:Sidereal, tropical, and anomalistic years
5846:International Commission on Stratigraphy
3680:
3678:
2681:
2432:
958:. The academic year may be divided into
29:Time of one planet's orbit around a star
6068:
3597:
3595:
3298:from the original on September 8, 2023,
3287:from the original on September 8, 2023,
3223:"The Unified Code for Units of Measure"
3030:
2274:= 365.25 days for the mean Julian year;
2091:seconds), and a leap year is 366 days (
882:and thus is shorter than a solar year.
3459:Astronomical Almanac for the Year 2011
3401:Astronomical Almanac for the year 2011
3386:Astronomical Almanac for the Year 2010
3345:Astronomical Almanac for the Year 2011
3325:from the original on September 8, 2023
3217:
3215:
3083:. International Astronomical Union IAU
736:A modern adaptation of the historical
681:days; with a relative error below one
3923:"Push to define year sparks time war"
3366:Calendar Description and Coordination
696:days) and even closer to the current
437:. Both Indo-European words for year,
7:
5277:
3319:Astronomical Applications Department
1593:adding citations to reliable sources
850:("year of the world"), used for the
632:, proposed in 1923 and used in some
4298:. Oxford: Oxford University Press.
3687:"North American Stratigraphic Code"
3059:Glenn Learning Technologies Project
969:roughly equal-length terms (called
3921:Biever, Celeste (April 27, 2011).
3304:. United States Naval Observatory.
2200:is "a", taken from the Latin word
2196:A common symbol for the year as a
932:it runs from July 1; while in the
581:Astronomical years do not have an
36:The Twelve Months (disambiguation)
25:
5566:Discrete time and continuous time
2445:Common scientific uses and notes
2250:Unified Code for Units of Measure
1762:Year length difference from 2000
1660:Numerical value of year variation
1218:such as the internationally used
1078:Unified Code for Units of Measure
496:means "in the year of the Lord".
6131:
6119:
6107:
6095:
6083:
6071:
5491:
5485:
5276:
5267:
5266:
3776:International Astronomical Union
3739:"AAS Style Guide - AAS Journals"
2308:International Astronomical Union
2267:days for the mean tropical year;
1569:
1466:. It is currently less than the
3571:Science Bowl Practice Questions
3471:Seidelmann, P. Kenneth (2013).
3302:The Astronomical Almanac Online
2434:Units of time with SI prefixes
1580:needs additional citations for
1484:Gaussian gravitational constant
1438:of a star. It differs from the
1363:use this for celebrating their
780:) as the beginning of the era.
418:"year" (only the dative plural
5639:History of timekeeping devices
4294:Whitrow, Gerald James (2003).
4255:Fraser, Julius Thomas (1987).
2179:Effect of Sun angle on climate
1919:Draconic, also called eclipse
1394:months of 30 days each plus 5
1:
4035:10.1007/978-3-642-11274-4_611
3949:10.1016/S0262-4079(11)60955-X
3349:US Government Printing Office
3249:IERS EOP PC Useful constants.
2679:These abbreviations include:
2652:Abbreviations for "years ago"
2461:or 10 years, also known as a
2155:is the time it takes Earth's
1309:days; at the epoch J2000.0).
707:days that it aims to match.
4027:Encyclopedia of Astrobiology
3503:Astronomy & Astrophysics
3040:, s.v. "year", entry 2.b.: "
1496:days (365 d 6 h 9 min 56 s).
1203:= January 1, 2000, 12:00:00
1161:Axial precession (astronomy)
854:and abbreviated AM; and the
414:, which also yielded Gothic
327:
164:are recognized and tracked.
5586:Gravitational time dilation
5422:Barycentric Coordinate Time
5081:Geological history of Earth
4259:Time, the Familiar Stranger
3102:Wilkins, George A. (1989).
2968:Astronomical year numbering
2531:Geology, paleontology, and
2472:Geology, paleontology, and
2438:
2348:In 2011, the IUPAC and the
2159:to revolve once around the
1666:Mean year lengths for 2000
1553:scale, or its predecessor,
1448:precession of the equinoxes
1189:). Its average duration is
1002:, may divide the year into
826:Other eras include that of
817:Astronomical year numbering
527:
519:
499:The Greek word for "year",
6175:
5442:Geocentric Coordinate Time
5427:Barycentric Dynamical Time
5365:Coordinated Universal Time
4433:Orders of magnitude (time)
4135:10.1103/PhysRevC.67.014310
4088:10.1103/PhysRevC.76.064603
3874:Pure and Applied Chemistry
3543:demonstrations.wolfram.com
3524:10.1051/0004-6361:20041335
3441:Taff, Lawrence G. (1985).
3416:Astronomy and Astrophysics
3347:. Washington and Taunton:
3300:(c. 2022). In "Glossary",
3008:Orders of magnitude (time)
2657:
2565:is approximately 13.8 Ga.
2559:the formation of the Earth
2418:Orders of magnitude (time)
2415:
2176:
2170:
2130:Greater astronomical years
1622:
1248:
1158:
1148:
1080:(but not according to the
1039:
1028:
947:
901:
714:
501:
409:
321:
298:
33:
5596:Time-translation symmetry
5483:
5407:International Atomic Time
5334:
5262:
5144:Time translation symmetry
3375:Maya World Studies Center
3254:October 29, 2012, at the
2866:Last geomagnetic reversal
2783:
2753:
2729:
2700:
2697:
2692:
2689:
2684:
2557:and geology For example,
2192:Symbols and abbreviations
1935:Solar days: vague, and a
1910:
1907:
1518:B = 1900.0 + (Julian date
1088:, see below), the symbol
894:to simplify daily rates.
838:("from the foundation of
634:Eastern Orthodox Churches
567:"time period; year" uses
509:"old", from the PIE word
69:. For example, a year on
4021:Arndt, Nicholas (2011),
3887:10.1351/PAC-REC-09-01-22
3802:January 1, 2023, at the
3355:. 2009. pp. A1, C2.
2206:. For example, the U.S.
1442:for stars away from the
791:of the date of birth of
662:aims to ensure that the
505:, is cognate with Latin
453:, respectively (compare
5856:Astronomical chronology
5829:Archaeology and geology
5536:Absolute space and time
5452:IERS Reference Meridian
5447:International Date Line
5358:International standards
5099:Absolute space and time
4750:Astronomical chronology
3851:10.1351/goldbook.y06723
3828:April 17, 2019, at the
3757:April 11, 2019, at the
3515:2004A&A...428..261L
3428:1994A&A...282..663S
3371:April 26, 2012, at the
3055:"Calendar Calculations"
2812:Out-of-Africa migration
2367:seconds (approximately
2119:days and hence exactly
1042:Julian year (astronomy)
956:educational institution
936:the fiscal year of the
630:Revised Julian calendar
624:Revised Julian calendar
192:of 366 days, as do the
104:, marked by changes in
5149:Time reversal symmetry
4453:Italian six-hour clock
3353:UK Hydrographic Office
3155:Ziggelaar, A. (1983).
3104:"The IAU Style Manual"
2501:uranium-thorium dating
2202:
1386:
1185:
1179:
1139:SI multiplier prefixes
874:abbreviated AH), is a
868:
856:Japanese imperial eras
844:
832:
756:(for the time zone of
668:northward equinox year
490:
466:
390:
376:
366:
354:
213:
50:
5815:Weekday determination
5701:Sundial markup schema
4914:Time and fate deities
4859:The Unreality of Time
4798:A series and B series
4000:UK Metric Association
3663:on September 18, 2019
3281:"longitude, ecliptic"
2658:Further information:
2412:SI prefix multipliers
2402:UK Metric Association
2177:Further information:
1623:Further information:
1384:The vague year, from
1249:Further information:
940:runs from October 1.
813:Before the Common Era
715:Further information:
538:"bull calf", English
112:, and, consequently,
44:
5836:Chronological dating
5576:Theory of relativity
5437:Daylight saving time
5165:Chronological dating
5134:Theory of relativity
4478:Daylight saving time
3632:on December 20, 2008
2822:Neolithic Revolution
2817:Last Glacial Maximum
1991:Sidereal, for epoch
1650:post-glacial rebound
1589:improve this article
1008:positive correlation
842:), abbreviated AUC;
789:6th century estimate
744:(1925), is a purely
742:Solar Hijri calendar
589:such as leap years.
402:singular) is from a
63:astronomical objects
45:An animation of the
6046:Time value of money
5841:Geologic time scale
5696:History of sundials
5561:Cosmological decade
5513:Greenwich Mean Time
5344:Orders of magnitude
4458:Thai six-hour clock
4269:1988tfs..book.....F
4196:10.1038/nature02459
4188:2004Natur.428..637C
4127:2003PhRvC..67a4310D
4080:2007PhRvC..76f4603B
3976:. November 19, 2011
3941:2011NewSc.210R..10B
3711:10.1306/07050504129
3703:2005BAAPG..89.1547.
3292:"dynamical equinox"
3229:. November 21, 2017
3142:1924PA.....32..407S
2876:Last Glacial Period
2563:age of the universe
2533:celestial mechanics
2435:
2328:). Since 1993, the
2188:from year to year.
1765:
1667:
1000:Boston Latin School
886:Pragmatic divisions
557:"year", originally
542:"ram" (Old English
488:means "each year",
372:accusative singular
337:Old Church Slavonic
293:Proto-Indo-European
96:Due to the Earth's
6021:Mental chronometry
5649:Marine chronometer
5501:Obsolete standards
4988:Rosy retrospection
4966:Mental chronometry
4790:Philosophy of time
2491:technique such as
2489:radiocarbon dating
2469:and calendar uses.
2433:
2285:days for the mean
1761:
1665:
1446:due mainly to the
1220:Gregorian calendar
1212:ecliptic longitude
1031:Astronomical month
1025:Astronomical years
938:federal government
805:inclusive counting
717:Lunisolar calendar
698:March equinox year
660:Gregorian calendar
654:Gregorian calendar
608:In astronomy, the
182:Gregorian calendar
51:
47:inner Solar System
6059:
6058:
5869:Nuclear timescale
5551:Continuous signal
5290:
5289:
5200:
5199:
5175:Circadian rhythms
4993:Tense–aspect–mood
4848:Temporal finitism
4725:
4724:
4701:Grandfather clock
4305:978-0-19-860781-6
4278:978-0-87023-576-4
4182:(6983): 637–640.
4044:978-3-642-11274-4
3482:978-1-891389-85-6
3452:978-0-471-89316-5
3200:on April 30, 2019
3190:978-1-891389-85-6
3130:Popular Astronomy
2993:List of calendars
2947:
2946:
2926:Formation of the
2908:billion years ago
2848:million years ago
2649:
2648:
2641:The half-life of
2398:physical quantity
2386:parts per million
2135:Equinoctial cycle
2025:
2024:
1887:
1886:
1759:
1758:
1621:
1620:
1613:
1168:astronomical year
793:Jesus of Nazareth
787:. Its epoch is a
664:northward equinox
188:of 365 days or a
16:(Redirected from
6166:
6136:
6135:
6124:
6123:
6122:
6112:
6111:
6100:
6099:
6098:
6088:
6087:
6076:
6075:
6067:
5760:Dominical letter
5691:Equation of time
5654:Marine sandglass
5495:
5489:
5467:Terrestrial Time
5324:Time measurement
5317:
5310:
5303:
5294:
5280:
5279:
5270:
5269:
5187:Glottochronology
5027:
4943:Human experience
4803:B-theory of time
4401:
4345:
4338:
4331:
4322:
4317:
4290:
4262:
4242:
4241:
4239:
4237:
4232:on June 16, 2016
4222:
4216:
4215:
4171:
4165:
4164:
4153:
4147:
4146:
4120:
4098:
4092:
4091:
4061:
4055:
4054:
4053:
4051:
4018:
4012:
4011:
4009:
4007:
3992:
3986:
3985:
3983:
3981:
3966:
3960:
3959:
3957:
3955:
3918:
3909:
3908:
3898:
3881:(5): 1159–1162.
3870:
3861:
3855:
3854:
3838:
3832:
3812:
3806:
3793:
3787:
3786:
3784:
3782:
3768:
3762:
3749:
3743:
3742:
3735:
3729:
3728:
3721:
3715:
3714:
3682:
3673:
3672:
3670:
3668:
3653:
3642:
3641:
3639:
3637:
3617:
3611:
3610:
3608:
3599:
3590:
3589:
3587:
3585:
3580:on March 7, 2010
3579:
3568:
3560:
3554:
3553:
3551:
3549:
3535:
3529:
3528:
3526:
3494:
3488:
3486:
3468:
3462:
3456:
3438:
3432:
3431:
3411:
3405:
3404:
3396:
3390:
3389:
3382:
3376:
3363:
3357:
3356:
3341:
3335:
3334:
3332:
3330:
3311:
3305:
3299:
3288:
3277:
3271:
3264:
3258:
3245:
3239:
3238:
3236:
3234:
3219:
3210:
3209:
3207:
3205:
3199:
3193:. Archived from
3182:
3171:
3165:
3164:
3152:
3146:
3145:
3125:
3119:
3118:
3111:IAU Transactions
3108:
3099:
3093:
3092:
3090:
3088:
3077:
3071:
3070:
3068:
3066:
3051:
3045:
3035:
2779:thousand million
2682:
2497:dendrochronology
2436:
2376:
2375:
2372:
2366:
2364:
2361:
2317:Since 1987, the
2306:Since 1989, the
2284:
2266:
2265:
2205:
2125:
2124:
2118:
2117:
2111:
2110:
2107:
2101:
2100:
2094:
2090:
2089:
2086:
2080:
2079:
2073:
2066:
2065:
2062:
2053:
2051:
2042:
2040:
2004:
2003:
1988:
1987:
1975:
1965:
1952:
1951:
1905:
1766:
1668:
1625:ΔT (timekeeping)
1616:
1609:
1605:
1602:
1596:
1573:
1565:
1551:Terrestrial Time
1545:
1544:
1541:
1535:
1534:
1530:
1527:
1512:Friedrich Bessel
1495:
1494:
1436:heliacal risings
1389:
1345:
1344:
1341:
1308:
1307:
1303:
1297:
1296:
1293:
1286:lunar precession
1279:
1278:
1275:
1224:axial precession
1198:
1197:
1194:
1188:
1182:
1130:
1122:
1121:
1108:
1107:
1104:
1067:
1066:
1060:
1059:
916:For example, in
892:365-day calendar
873:
849:
837:
752:) on the day of
706:
705:
695:
694:
680:
679:
649:
648:
642:
641:
573:"summer; year".
530:
522:
504:
503:
495:
469:
412:
411:
393:
379:
369:
364:masculine noun;
359:
349:"of this year".
330:
324:
323:
303:
302:
261:). Cognates are
238:
204:In English, the
194:Julian calendars
154:seasonal tropics
65:to complete one
21:
6174:
6173:
6169:
6168:
6167:
6165:
6164:
6163:
6144:
6143:
6142:
6130:
6120:
6118:
6106:
6096:
6094:
6082:
6070:
6062:
6060:
6055:
5992:
5883:
5850:
5824:
5705:
5605:
5556:Coordinate time
5528:Time in physics
5522:
5496:
5490:
5481:
5353:
5330:
5321:
5291:
5286:
5258:
5249:Time immemorial
5196:
5153:
5114:Coordinate time
5085:
5039:Geological time
5015:
4998:Time management
4961:Generation time
4945:
4937:
4882:
4864:
4784:
4743:
4721:
4609:
4527:
4444:
4437:
4393:
4385:
4354:
4349:
4306:
4293:
4279:
4254:
4251:
4249:Further reading
4246:
4245:
4235:
4233:
4224:
4223:
4219:
4173:
4172:
4168:
4155:
4154:
4150:
4118:nucl-ex/0211013
4100:
4099:
4095:
4063:
4062:
4058:
4049:
4047:
4045:
4020:
4019:
4015:
4005:
4003:
4002:. July 12, 2017
3994:
3993:
3989:
3979:
3977:
3968:
3967:
3963:
3953:
3951:
3920:
3919:
3912:
3868:
3863:
3862:
3858:
3840:
3839:
3835:
3830:Wayback Machine
3813:
3809:
3804:Wayback Machine
3794:
3790:
3780:
3778:
3770:
3769:
3765:
3759:Wayback Machine
3750:
3746:
3737:
3736:
3732:
3723:
3722:
3718:
3684:
3683:
3676:
3666:
3664:
3655:
3654:
3645:
3635:
3633:
3620:Rowlett, Russ.
3619:
3618:
3614:
3606:
3601:
3600:
3593:
3583:
3581:
3577:
3566:
3562:
3561:
3557:
3547:
3545:
3537:
3536:
3532:
3496:
3495:
3491:
3483:
3470:
3469:
3465:
3453:
3440:
3439:
3435:
3413:
3412:
3408:
3398:
3397:
3393:
3384:
3383:
3379:
3373:Wayback Machine
3364:
3360:
3343:
3342:
3338:
3328:
3326:
3313:
3312:
3308:
3290:
3279:
3278:
3274:
3265:
3261:
3256:Wayback Machine
3246:
3242:
3232:
3230:
3221:
3220:
3213:
3203:
3201:
3197:
3191:
3180:
3173:
3172:
3168:
3154:
3153:
3149:
3127:
3126:
3122:
3106:
3101:
3100:
3096:
3086:
3084:
3079:
3078:
3074:
3064:
3062:
3053:
3052:
3048:
3036:
3032:
3027:
3022:
3017:
2963:
2942:
2940:
2909:
2905:
2903:
2895:
2893:
2891:
2849:
2845:
2843:
2834:
2832:
2830:
2790:
2776:
2768:
2764:
2762:
2744:
2740:
2738:
2718:
2694:
2686:
2662:
2654:
2420:
2414:
2373:
2370:
2368:
2362:
2359:
2357:
2296:
2282:
2280:
2273:
2263:
2261:
2259:
2194:
2181:
2175:
2169:
2161:Galactic Center
2149:
2137:
2132:
2122:
2120:
2115:
2113:
2108:
2105:
2103:
2098:
2096:
2092:
2087:
2084:
2082:
2077:
2075:
2071:
2063:
2060:
2058:
2049:
2047:
2038:
2036:
2020:solar calendars
2001:
1999:
1985:
1983:
1973:
1963:
1949:
1947:
1941:solar calendars
1892:
1763:
1661:
1627:
1617:
1606:
1600:
1597:
1586:
1574:
1563:
1542:
1539:
1537:
1532:
1528:
1525:
1523:
1521:
1503:
1492:
1490:
1476:
1456:
1432:
1382:
1373:Jewish calendar
1353:
1342:
1339:
1337:
1319:full moon cycle
1315:
1313:Full moon cycle
1305:
1301:
1299:
1294:
1291:
1289:
1276:
1273:
1271:
1265:eclipse seasons
1253:
1251:Draconic period
1247:
1216:solar calendars
1195:
1192:
1190:
1164:
1157:
1149:Main articles:
1147:
1128:
1126:
1119:
1117:
1105:
1102:
1100:
1097:
1064:
1062:
1057:
1055:
1044:
1038:
1033:
1027:
952:
946:
906:
900:
888:
862:, (year of the
852:Hebrew calendar
834:Ab Urbe Condita
774:cardinal number
766:
740:, known as the
738:Jalali calendar
731:Hindu calendars
727:Hebrew calendar
719:
713:
711:Other calendars
703:
701:
692:
690:
677:
675:
656:
646:
644:
639:
637:
626:
599:Julian calendar
595:
593:Julian calendar
579:
270:Old High German
222:
202:
170:
108:, the hours of
39:
30:
23:
22:
15:
12:
11:
5:
6172:
6170:
6162:
6161:
6156:
6146:
6145:
6141:
6140:
6128:
6116:
6104:
6092:
6080:
6057:
6056:
6054:
6053:
6048:
6043:
6041:Time metrology
6038:
6033:
6028:
6023:
6018:
6017:
6016:
6006:
6000:
5998:
5997:Related topics
5994:
5993:
5991:
5990:
5985:
5980:
5975:
5970:
5965:
5960:
5955:
5950:
5945:
5940:
5935:
5930:
5925:
5920:
5915:
5910:
5905:
5900:
5894:
5892:
5885:
5884:
5882:
5881:
5876:
5871:
5866:
5860:
5858:
5852:
5851:
5849:
5848:
5843:
5838:
5832:
5830:
5826:
5825:
5823:
5822:
5817:
5812:
5807:
5802:
5797:
5792:
5787:
5782:
5777:
5772:
5767:
5762:
5757:
5752:
5747:
5742:
5736:
5731:
5726:
5721:
5715:
5713:
5707:
5706:
5704:
5703:
5698:
5693:
5688:
5686:Dialing scales
5683:
5678:
5673:
5672:
5671:
5661:
5656:
5651:
5646:
5641:
5636:
5631:
5626:
5621:
5615:
5613:
5607:
5606:
5604:
5603:
5598:
5593:
5588:
5583:
5578:
5573:
5568:
5563:
5558:
5553:
5548:
5543:
5538:
5532:
5530:
5524:
5523:
5521:
5520:
5518:Prime meridian
5515:
5510:
5508:Ephemeris time
5504:
5502:
5498:
5497:
5484:
5482:
5480:
5479:
5477:180th meridian
5474:
5469:
5464:
5459:
5454:
5449:
5444:
5439:
5434:
5429:
5424:
5419:
5414:
5409:
5404:
5399:
5394:
5389:
5384:
5379:
5374:
5373:
5372:
5361:
5359:
5355:
5354:
5352:
5351:
5346:
5341:
5335:
5332:
5331:
5322:
5320:
5319:
5312:
5305:
5297:
5288:
5287:
5285:
5284:
5274:
5263:
5260:
5259:
5257:
5256:
5251:
5246:
5241:
5234:
5229:
5224:
5219:
5214:
5208:
5206:
5202:
5201:
5198:
5197:
5195:
5194:
5192:Time geography
5189:
5184:
5182:Clock reaction
5179:
5178:
5177:
5167:
5161:
5159:
5155:
5154:
5152:
5151:
5146:
5141:
5136:
5131:
5126:
5121:
5116:
5111:
5106:
5101:
5095:
5093:
5087:
5086:
5084:
5083:
5078:
5073:
5072:
5071:
5066:
5061:
5056:
5051:
5046:
5035:
5033:
5024:
5017:
5016:
5014:
5013:
5000:
4995:
4990:
4985:
4984:
4983:
4981:time signature
4978:
4968:
4963:
4958:
4952:
4950:
4939:
4938:
4936:
4935:
4934:
4933:
4923:
4922:
4921:
4911:
4906:
4901:
4896:
4891:
4885:
4883:
4881:
4880:
4875:
4869:
4866:
4865:
4863:
4862:
4855:
4853:Temporal parts
4850:
4845:
4840:
4835:
4830:
4825:
4823:Eternal return
4820:
4815:
4810:
4808:Chronocentrism
4805:
4800:
4794:
4792:
4786:
4785:
4783:
4782:
4777:
4772:
4767:
4762:
4757:
4752:
4746:
4744:
4742:
4741:
4736:
4730:
4727:
4726:
4723:
4722:
4720:
4719:
4718:
4717:
4703:
4698:
4693:
4688:
4687:
4686:
4681:
4680:
4679:
4674:
4664:
4659:
4654:
4649:
4648:
4647:
4637:
4636:
4635:
4619:
4617:
4611:
4610:
4608:
4607:
4600:
4595:
4593:Hindu Panchang
4590:
4585:
4580:
4575:
4570:
4565:
4560:
4559:
4558:
4553:
4548:
4537:
4535:
4529:
4528:
4526:
4525:
4520:
4515:
4510:
4505:
4500:
4495:
4490:
4485:
4480:
4475:
4470:
4465:
4460:
4455:
4449:
4447:
4439:
4438:
4436:
4435:
4430:
4425:
4420:
4415:
4409:
4407:
4398:
4387:
4386:
4384:
4383:
4378:
4373:
4368:
4362:
4360:
4356:
4355:
4350:
4348:
4347:
4340:
4333:
4325:
4319:
4318:
4304:
4291:
4277:
4250:
4247:
4244:
4243:
4217:
4166:
4148:
4093:
4056:
4043:
4013:
3987:
3961:
3910:
3856:
3833:
3807:
3788:
3763:
3744:
3730:
3716:
3674:
3643:
3612:
3591:
3555:
3530:
3489:
3481:
3463:
3451:
3433:
3422:(2): 663–683.
3406:
3391:
3377:
3358:
3336:
3306:
3272:
3259:
3240:
3211:
3189:
3166:
3147:
3120:
3094:
3072:
3046:
3029:
3028:
3026:
3023:
3021:
3018:
3016:
3015:
3010:
3005:
3000:
2995:
2990:
2985:
2980:
2975:
2970:
2964:
2962:
2959:
2951:Before Present
2945:
2944:
2937:
2936:
2935:
2930:
2924:
2916:
2915:Time ago in Ga
2913:
2911:
2910:giga years ago
2906:
2901:
2898:
2897:
2890:5.3 to 2.6 mya
2888:
2887:
2886:
2879:
2868:
2863:
2856:
2855:Time ago in Ma
2853:
2851:
2850:Mega years ago
2846:
2841:
2838:
2837:
2835:Around 10 kya
2829:Around 200 kya
2826:
2825:
2824:
2819:
2814:
2809:
2803:Appearance of
2799:
2798:Time ago in ka
2796:
2794:
2793:kilo years ago
2791:
2788:
2785:
2784:
2782:
2773:
2770:
2765:
2758:
2755:
2754:
2752:
2749:
2746:
2741:
2734:
2731:
2730:
2728:
2727:Thousand years
2725:
2722:
2719:
2714:
2711:
2710:
2707:
2703:
2702:
2699:
2696:
2691:
2688:
2687:abbreviations
2674:Before Present
2660:Before Present
2653:
2650:
2647:
2646:
2639:
2632:
2624:
2623:
2605:
2598:
2590:
2589:
2582:
2575:
2567:
2566:
2552:
2545:
2537:
2536:
2529:
2522:
2514:
2513:
2510:Before Present
2487:, where a non−
2470:
2455:
2447:
2446:
2443:
2440:
2413:
2410:
2382:
2381:
2378:ephemeris days
2294:
2291:
2290:
2287:Gregorian year
2278:
2275:
2271:
2268:
2257:
2219:Earth sciences
2193:
2190:
2171:Main article:
2168:
2165:
2148:
2145:
2136:
2133:
2131:
2128:
2023:
2022:
2013:
2009:
2008:
2005:
1996:
1995:
1989:
1980:
1979:
1976:
1970:
1969:
1966:
1960:
1959:
1953:
1944:
1943:
1933:
1929:
1928:
1925:
1921:
1920:
1917:
1913:
1912:
1909:
1891:
1888:
1885:
1884:
1881:
1878:
1875:
1872:
1868:
1867:
1864:
1861:
1858:
1855:
1851:
1850:
1847:
1844:
1841:
1838:
1834:
1833:
1830:
1827:
1824:
1821:
1817:
1816:
1813:
1810:
1807:
1804:
1800:
1799:
1796:
1793:
1790:
1787:
1783:
1782:
1779:
1776:
1773:
1770:
1757:
1756:
1753:
1750:
1747:
1744:
1740:
1739:
1736:
1733:
1730:
1727:
1723:
1722:
1719:
1716:
1713:
1710:
1704:
1703:
1700:
1697:
1694:
1691:
1685:
1684:
1681:
1678:
1675:
1672:
1658:
1657:
1654:sea level rise
1642:
1638:
1619:
1618:
1577:
1575:
1568:
1562:
1559:
1555:ephemeris time
1547:
1546:
1519:
1507:Besselian year
1502:
1501:Besselian year
1499:
1498:
1497:
1475:
1472:
1455:
1452:
1431:
1428:
1381:
1378:
1352:
1349:
1348:
1347:
1314:
1311:
1298:Julian years (
1282:
1281:
1246:
1245:Draconic year
1243:
1146:
1143:
1135:
1134:
1124:
1095:
1052:ephemeris days
1040:Main article:
1037:
1034:
1026:
1023:
960:academic terms
948:Main article:
945:
942:
926:United Kingdom
902:Main article:
899:
896:
887:
884:
876:lunar calendar
858:. The Islamic
785:civil calendar
765:
764:Year numbering
762:
754:vernal equinox
746:solar calendar
712:
709:
655:
652:
625:
622:
594:
591:
578:
575:
455:Vedic Sanskrit
422:is attested).
362:2nd declension
248:Proto-Germanic
221:
218:
201:
198:
169:
166:
118:soil fertility
28:
24:
14:
13:
10:
9:
6:
4:
3:
2:
6171:
6160:
6157:
6155:
6154:Types of year
6152:
6151:
6149:
6139:
6134:
6129:
6127:
6117:
6115:
6110:
6105:
6103:
6093:
6091:
6086:
6081:
6079:
6074:
6069:
6065:
6052:
6049:
6047:
6044:
6042:
6039:
6037:
6034:
6032:
6029:
6027:
6024:
6022:
6019:
6015:
6012:
6011:
6010:
6007:
6005:
6002:
6001:
5999:
5995:
5989:
5986:
5984:
5981:
5979:
5976:
5974:
5971:
5969:
5966:
5964:
5961:
5959:
5956:
5954:
5951:
5949:
5946:
5944:
5941:
5939:
5936:
5934:
5931:
5929:
5926:
5924:
5921:
5919:
5916:
5914:
5911:
5909:
5906:
5904:
5901:
5899:
5896:
5895:
5893:
5891:
5890:units of time
5886:
5880:
5879:Sidereal time
5877:
5875:
5872:
5870:
5867:
5865:
5864:Galactic year
5862:
5861:
5859:
5857:
5853:
5847:
5844:
5842:
5839:
5837:
5834:
5833:
5831:
5827:
5821:
5820:Weekday names
5818:
5816:
5813:
5811:
5810:Tropical year
5808:
5806:
5803:
5801:
5798:
5796:
5793:
5791:
5788:
5786:
5783:
5781:
5778:
5776:
5775:Intercalation
5773:
5771:
5768:
5766:
5763:
5761:
5758:
5756:
5753:
5751:
5748:
5746:
5743:
5741:(lunar Hijri)
5740:
5737:
5735:
5732:
5730:
5727:
5725:
5722:
5720:
5717:
5716:
5714:
5712:
5708:
5702:
5699:
5697:
5694:
5692:
5689:
5687:
5684:
5682:
5679:
5677:
5674:
5670:
5667:
5666:
5665:
5662:
5660:
5657:
5655:
5652:
5650:
5647:
5645:
5642:
5640:
5637:
5635:
5632:
5630:
5627:
5625:
5622:
5620:
5617:
5616:
5614:
5612:
5608:
5602:
5599:
5597:
5594:
5592:
5589:
5587:
5584:
5582:
5581:Time dilation
5579:
5577:
5574:
5572:
5569:
5567:
5564:
5562:
5559:
5557:
5554:
5552:
5549:
5547:
5544:
5542:
5539:
5537:
5534:
5533:
5531:
5529:
5525:
5519:
5516:
5514:
5511:
5509:
5506:
5505:
5503:
5499:
5494:
5488:
5478:
5475:
5473:
5470:
5468:
5465:
5463:
5460:
5458:
5455:
5453:
5450:
5448:
5445:
5443:
5440:
5438:
5435:
5433:
5430:
5428:
5425:
5423:
5420:
5418:
5417:24-hour clock
5415:
5413:
5412:12-hour clock
5410:
5408:
5405:
5403:
5400:
5398:
5395:
5393:
5390:
5388:
5385:
5383:
5380:
5378:
5375:
5371:
5368:
5367:
5366:
5363:
5362:
5360:
5356:
5350:
5347:
5345:
5342:
5340:
5337:
5336:
5333:
5329:
5325:
5318:
5313:
5311:
5306:
5304:
5299:
5298:
5295:
5283:
5275:
5273:
5265:
5264:
5261:
5255:
5252:
5250:
5247:
5245:
5242:
5240:
5239:
5235:
5233:
5230:
5228:
5225:
5223:
5220:
5218:
5215:
5213:
5210:
5209:
5207:
5203:
5193:
5190:
5188:
5185:
5183:
5180:
5176:
5173:
5172:
5171:
5170:Chronobiology
5168:
5166:
5163:
5162:
5160:
5156:
5150:
5147:
5145:
5142:
5140:
5137:
5135:
5132:
5130:
5127:
5125:
5122:
5120:
5117:
5115:
5112:
5110:
5107:
5105:
5104:Arrow of time
5102:
5100:
5097:
5096:
5094:
5092:
5088:
5082:
5079:
5077:
5076:Geochronology
5074:
5070:
5067:
5065:
5062:
5060:
5057:
5055:
5052:
5050:
5047:
5045:
5042:
5041:
5040:
5037:
5036:
5034:
5032:
5028:
5025:
5023:
5018:
5012:
5008:
5004:
5001:
4999:
4996:
4994:
4991:
4989:
4986:
4982:
4979:
4977:
4974:
4973:
4972:
4969:
4967:
4964:
4962:
4959:
4957:
4954:
4953:
4951:
4949:
4944:
4940:
4932:
4929:
4928:
4927:
4926:Wheel of time
4924:
4920:
4917:
4916:
4915:
4912:
4910:
4907:
4905:
4902:
4900:
4897:
4895:
4892:
4890:
4887:
4886:
4884:
4879:
4876:
4874:
4871:
4870:
4867:
4861:
4860:
4856:
4854:
4851:
4849:
4846:
4844:
4841:
4839:
4836:
4834:
4831:
4829:
4826:
4824:
4821:
4819:
4816:
4814:
4811:
4809:
4806:
4804:
4801:
4799:
4796:
4795:
4793:
4791:
4787:
4781:
4778:
4776:
4773:
4771:
4770:Periodization
4768:
4766:
4763:
4761:
4758:
4756:
4753:
4751:
4748:
4747:
4745:
4740:
4737:
4735:
4732:
4731:
4728:
4716:
4715:
4711:
4710:
4709:
4708:
4704:
4702:
4699:
4697:
4696:Digital clock
4694:
4692:
4689:
4685:
4682:
4678:
4675:
4673:
4670:
4669:
4668:
4665:
4663:
4660:
4658:
4655:
4653:
4650:
4646:
4643:
4642:
4641:
4638:
4634:
4631:
4630:
4629:
4626:
4625:
4624:
4621:
4620:
4618:
4616:
4612:
4606:
4605:
4601:
4599:
4596:
4594:
4591:
4589:
4586:
4584:
4581:
4579:
4576:
4574:
4571:
4569:
4566:
4564:
4561:
4557:
4554:
4552:
4549:
4547:
4544:
4543:
4542:
4539:
4538:
4536:
4534:
4530:
4524:
4521:
4519:
4516:
4514:
4511:
4509:
4506:
4504:
4501:
4499:
4496:
4494:
4491:
4489:
4486:
4484:
4481:
4479:
4476:
4474:
4473:Relative hour
4471:
4469:
4468:24-hour clock
4466:
4464:
4463:12-hour clock
4461:
4459:
4456:
4454:
4451:
4450:
4448:
4446:
4440:
4434:
4431:
4429:
4426:
4424:
4421:
4419:
4416:
4414:
4411:
4410:
4408:
4406:
4402:
4399:
4397:
4392:
4388:
4382:
4379:
4377:
4374:
4372:
4369:
4367:
4364:
4363:
4361:
4357:
4353:
4346:
4341:
4339:
4334:
4332:
4327:
4326:
4323:
4315:
4311:
4307:
4301:
4297:
4296:What is Time?
4292:
4288:
4284:
4280:
4274:
4270:
4266:
4261:
4260:
4253:
4252:
4248:
4231:
4227:
4221:
4218:
4213:
4209:
4205:
4201:
4197:
4193:
4189:
4185:
4181:
4177:
4170:
4167:
4163:
4159:
4152:
4149:
4144:
4140:
4136:
4132:
4128:
4124:
4119:
4114:
4111:(1): 014310.
4110:
4106:
4105:
4097:
4094:
4089:
4085:
4081:
4077:
4074:(6): 064603.
4073:
4069:
4068:
4060:
4057:
4046:
4040:
4036:
4032:
4028:
4024:
4017:
4014:
4001:
3997:
3996:"Style guide"
3991:
3988:
3975:
3971:
3965:
3962:
3950:
3946:
3942:
3938:
3934:
3930:
3929:
3928:New Scientist
3924:
3917:
3915:
3911:
3906:
3902:
3897:
3892:
3888:
3884:
3880:
3876:
3875:
3867:
3860:
3857:
3852:
3848:
3844:
3837:
3834:
3831:
3827:
3824:
3821:
3817:
3811:
3808:
3805:
3801:
3798:
3792:
3789:
3777:
3773:
3767:
3764:
3760:
3756:
3753:
3748:
3745:
3740:
3734:
3731:
3726:
3720:
3717:
3712:
3708:
3704:
3700:
3696:
3692:
3688:
3681:
3679:
3675:
3662:
3658:
3652:
3650:
3648:
3644:
3631:
3627:
3623:
3616:
3613:
3605:
3598:
3596:
3592:
3576:
3572:
3565:
3559:
3556:
3544:
3540:
3534:
3531:
3525:
3520:
3516:
3512:
3508:
3504:
3500:
3493:
3490:
3484:
3478:
3474:
3467:
3464:
3460:
3454:
3448:
3444:
3437:
3434:
3429:
3425:
3421:
3417:
3410:
3407:
3402:
3395:
3392:
3387:
3381:
3378:
3374:
3370:
3367:
3362:
3359:
3354:
3350:
3346:
3340:
3337:
3324:
3320:
3316:
3310:
3307:
3303:
3297:
3293:
3286:
3282:
3276:
3273:
3269:
3263:
3260:
3257:
3253:
3250:
3244:
3241:
3228:
3224:
3218:
3216:
3212:
3196:
3192:
3186:
3179:
3178:
3170:
3167:
3162:
3158:
3151:
3148:
3143:
3139:
3135:
3131:
3124:
3121:
3116:
3112:
3105:
3098:
3095:
3082:
3076:
3073:
3060:
3056:
3050:
3047:
3043:
3039:
3034:
3031:
3024:
3019:
3014:
3011:
3009:
3006:
3004:
3001:
2999:
2998:List of years
2996:
2994:
2991:
2989:
2986:
2984:
2981:
2979:
2976:
2974:
2971:
2969:
2966:
2965:
2960:
2958:
2956:
2952:
2938:
2934:
2931:
2929:
2925:
2923:
2919:
2918:
2917:
2914:
2912:
2907:
2900:
2899:
2889:
2884:
2880:
2877:
2873:
2869:
2867:
2864:
2862:
2859:
2858:
2857:
2854:
2852:
2847:
2840:
2839:
2836:
2833:Around 20 kya
2831:Around 60 kya
2827:
2823:
2820:
2818:
2815:
2813:
2810:
2808:
2807:
2802:
2801:
2800:
2797:
2795:
2792:
2787:
2786:
2780:
2775:Billion years
2774:
2771:
2767:billion years
2766:
2761:
2757:
2756:
2751:Million years
2750:
2747:
2743:million years
2742:
2737:
2733:
2732:
2726:
2723:
2720:
2717:
2713:
2712:
2708:
2705:
2704:
2683:
2680:
2677:
2675:
2671:
2668:and "ya" for
2667:
2661:
2656:
2651:
2644:
2640:
2637:
2633:
2630:
2626:
2625:
2621:
2617:
2614:
2610:
2606:
2603:
2599:
2596:
2592:
2591:
2587:
2583:
2580:
2576:
2573:
2569:
2568:
2564:
2560:
2556:
2553:
2550:
2546:
2543:
2539:
2538:
2534:
2530:
2527:
2523:
2520:
2516:
2515:
2511:
2506:
2502:
2498:
2494:
2490:
2486:
2483:
2479:
2475:
2471:
2468:
2464:
2460:
2456:
2453:
2449:
2448:
2444:
2441:
2437:
2431:
2429:
2425:
2419:
2411:
2409:
2407:
2403:
2399:
2395:
2389:
2387:
2379:
2355:
2354:
2353:
2351:
2346:
2344:
2343:
2337:
2336:
2331:
2327:
2326:
2320:
2315:
2313:
2309:
2304:
2302:
2301:
2288:
2276:
2269:
2255:
2254:
2253:
2251:
2246:
2244:
2240:
2236:
2232:
2228:
2224:
2220:
2215:
2213:
2209:
2204:
2199:
2191:
2189:
2187:
2180:
2174:
2173:Seasonal year
2167:Seasonal year
2166:
2164:
2162:
2158:
2154:
2153:Galactic year
2147:Galactic year
2146:
2144:
2142:
2134:
2129:
2127:
2069:
2056:
2045:
2034:
2030:
2021:
2017:
2014:
2011:
2010:
2006:
1998:
1997:
1994:
1990:
1982:
1981:
1977:
1972:
1971:
1967:
1962:
1961:
1958:
1954:
1946:
1945:
1942:
1938:
1934:
1931:
1930:
1926:
1923:
1922:
1918:
1915:
1914:
1906:
1903:
1901:
1897:
1889:
1882:
1879:
1876:
1873:
1870:
1869:
1865:
1862:
1859:
1856:
1853:
1852:
1848:
1845:
1842:
1839:
1836:
1835:
1831:
1828:
1825:
1822:
1819:
1818:
1814:
1811:
1808:
1805:
1802:
1801:
1797:
1794:
1791:
1788:
1785:
1784:
1780:
1777:
1774:
1771:
1768:
1767:
1754:
1751:
1748:
1745:
1742:
1741:
1737:
1734:
1731:
1728:
1725:
1724:
1720:
1717:
1714:
1711:
1709:
1706:
1705:
1701:
1698:
1695:
1692:
1690:
1687:
1686:
1682:
1679:
1676:
1673:
1670:
1669:
1663:
1655:
1651:
1646:
1643:
1639:
1636:
1632:
1631:
1630:
1626:
1615:
1612:
1604:
1594:
1590:
1584:
1583:
1578:This section
1576:
1572:
1567:
1566:
1560:
1558:
1556:
1552:
1517:
1516:
1515:
1513:
1508:
1500:
1489:
1488:
1487:
1485:
1481:
1480:Gaussian year
1474:Gaussian year
1473:
1471:
1469:
1468:sidereal year
1465:
1461:
1453:
1451:
1449:
1445:
1441:
1440:sidereal year
1437:
1430:Heliacal year
1429:
1427:
1425:
1421:
1417:
1413:
1409:
1405:
1404:Ancient Egypt
1401:
1397:
1393:
1388:
1379:
1377:
1374:
1370:
1366:
1362:
1358:
1350:
1336:
1335:
1334:
1332:
1331:synodic month
1328:
1324:
1320:
1312:
1310:
1287:
1270:
1269:
1268:
1266:
1262:
1258:
1252:
1244:
1242:
1240:
1236:
1232:
1227:
1225:
1221:
1217:
1213:
1208:
1206:
1202:
1187:
1181:
1176:
1171:
1169:
1162:
1156:
1155:Tropical year
1152:
1151:Sidereal year
1144:
1142:
1140:
1133:
1123:s = 1 a = 1 a
1115:
1114:
1113:
1111:
1099:, of exactly
1098:
1091:
1087:
1083:
1079:
1074:
1072:
1053:
1049:
1043:
1035:
1032:
1024:
1022:
1018:
1015:
1011:
1009:
1005:
1001:
997:
992:
990:
986:
981:
976:
972:
968:
963:
961:
957:
951:
950:Academic year
944:Academic year
943:
941:
939:
935:
934:United States
931:
927:
923:
919:
914:
911:
905:
897:
895:
893:
885:
883:
881:
877:
872:
871:
865:
861:
857:
853:
848:
847:
841:
836:
835:
829:
824:
822:
818:
814:
810:
809:Before Christ
806:
802:
798:
794:
790:
786:
781:
779:
775:
771:
763:
761:
759:
755:
751:
747:
743:
739:
734:
732:
728:
724:
718:
710:
708:
699:
688:
687:tropical year
684:
673:
672:tropical year
669:
665:
661:
653:
651:
635:
631:
623:
621:
619:
615:
611:
606:
604:
600:
592:
590:
588:
587:intercalation
584:
577:Intercalation
576:
574:
572:
571:
566:
565:
560:
556:
551:
549:
545:
541:
537:
536:
531:
529:
523:
521:
516:
512:
508:
497:
494:
493:
487:
486:
481:
477:
473:
468:
463:
459:
456:
452:
448:
444:
440:
436:
432:
428:
423:
421:
417:
413:
405:
401:
397:
392:
387:
384:singular and
383:
378:
373:
368:
363:
358:
357:
350:
348:
345:
341:
338:
334:
329:
319:
315:
312:
308:
304:
301:
294:
290:
289:
285:
281:
278:
274:
271:
267:
264:
260:
258:
252:
249:
245:
242:
234:
231:
227:
219:
217:
215:
211:
207:
199:
197:
195:
191:
187:
183:
179:
175:
174:calendar year
168:Calendar year
167:
165:
163:
159:
156:, the annual
155:
151:
147:
143:
139:
135:
131:
127:
123:
119:
115:
111:
107:
103:
99:
94:
92:
88:
87:academic year
84:
80:
79:seasonal year
76:
72:
68:
64:
60:
56:
48:
43:
37:
32:
27:
19:
6026:Decimal time
5957:
5755:Astronomical
5634:Complication
5629:Atomic clock
5244:Time capsule
5238:Tempus fugit
5236:
5158:Other fields
4857:
4838:Perdurantism
4760:Calendar era
4712:
4705:
4691:Cuckoo clock
4628:astronomical
4602:
4428:Unit of time
4359:Key concepts
4295:
4258:
4236:February 17,
4234:. Retrieved
4230:the original
4226:"Time Units"
4220:
4179:
4175:
4169:
4161:
4151:
4108:
4104:Phys. Rev. C
4102:
4096:
4071:
4067:Phys. Rev. C
4065:
4059:
4050:December 22,
4048:, retrieved
4026:
4016:
4004:. Retrieved
3999:
3990:
3978:. Retrieved
3973:
3964:
3952:. Retrieved
3935:(2810): 10.
3932:
3926:
3878:
3872:
3859:
3842:
3836:
3819:
3815:
3810:
3791:
3779:. Retrieved
3775:
3766:
3747:
3733:
3719:
3694:
3690:
3665:. Retrieved
3661:the original
3634:. Retrieved
3630:the original
3625:
3615:
3582:. Retrieved
3575:the original
3570:
3558:
3548:February 10,
3546:. Retrieved
3542:
3533:
3506:
3502:
3492:
3472:
3466:
3458:
3442:
3436:
3419:
3415:
3409:
3400:
3394:
3385:
3380:
3361:
3344:
3339:
3327:. Retrieved
3318:
3309:
3301:
3275:
3267:
3262:
3243:
3231:. Retrieved
3226:
3202:. Retrieved
3195:the original
3176:
3169:
3160:
3150:
3133:
3129:
3123:
3114:
3110:
3097:
3087:February 18,
3085:. Retrieved
3075:
3065:November 11,
3063:. Retrieved
3058:
3049:
3041:
3033:
3013:Unit of time
2954:
2948:
2872:Eemian Stage
2828:
2806:Homo sapiens
2804:
2678:
2669:
2665:
2663:
2655:
2643:tungsten-180
2638:or 10 years.
2628:
2604:or 10 years.
2594:
2571:
2551:or 10 years.
2541:
2528:or 10 years.
2518:
2467:anthropology
2451:
2427:
2423:
2421:
2405:
2393:
2390:
2383:
2347:
2341:
2334:
2324:
2316:
2312:Style Manual
2311:
2305:
2298:
2292:
2247:
2227:paleontology
2216:
2211:
2198:unit of time
2195:
2184:more than a
2182:
2157:Solar System
2150:
2138:
2026:
1893:
1671:Type of year
1659:
1628:
1607:
1601:October 2012
1598:
1587:Please help
1582:verification
1579:
1548:
1504:
1477:
1457:
1433:
1383:
1354:
1316:
1283:
1254:
1228:
1209:
1172:
1167:
1165:
1136:
1093:
1089:
1075:
1045:
1019:
1016:
1012:
1004:five or more
1003:
995:
993:
988:
984:
979:
974:
970:
966:
964:
953:
915:
907:
889:
880:lunar months
870:Anno Hegirae
828:Ancient Rome
825:
782:
770:calendar era
767:
735:
720:
697:
657:
627:
618:SI base unit
607:
603:intercalated
596:
580:
568:
562:
552:
547:
543:
539:
533:
525:
517:
510:
506:
498:
483:
461:
457:
450:
446:
442:
438:
434:
430:
426:
424:
419:
415:
407:
351:
346:
339:
313:
296:
286:
279:
272:
265:
254:
250:
246:) continues
243:
232:
225:
223:
206:unit of time
203:
200:Abbreviation
171:
95:
54:
52:
31:
26:
6126:Outer space
6090:Mathematics
6036:System time
6031:Metric time
5750:Solar Hijri
5676:Water clock
5659:Radio clock
5591:Time domain
5571:Proper time
5457:Leap second
5339:Chronometry
5254:Time travel
5232:System time
5139:Time domain
5124:Proper time
4948:use of time
4919:Father Time
4899:Immortality
4889:Ages of Man
4818:Endurantism
4775:Regnal year
4755:Big History
4684:water-based
4583:Solar Hijri
4493:Hexadecimal
4443:Measurement
4405:Chronometry
4391:Measurement
3896:10281/21054
3584:December 9,
3509:: 261–285.
3329:November 6,
2698:Definition
2695:equivalent
2693:SI-prefixed
2645:is 1.8 Ea.
2636:quintillion
2616:cadmium-113
2602:quadrillion
2581:or 10 years
2482:Pleistocene
2474:archaeology
2406:Style guide
2102:minutes or
2081:minutes or
1937:common year
1778:Anomalistic
1726:Anomalistic
1460:Sothic year
1454:Sothic year
1416:Mesoamerica
1387:annus vagus
1183:, singular
1116:365.25 d ×
1036:Julian year
910:fiscal year
904:Fiscal year
898:Fiscal year
811:or BCE for
797:Anno Domini
723:leap months
610:Julian year
524:"year" and
492:annō Dominī
480:anniversary
291:, from the
186:common year
162:dry seasons
150:subtropical
83:fiscal year
6148:Categories
6051:Timekeeper
6004:Chronology
5988:Millennium
5874:Precession
5780:Julian day
5601:T-symmetry
5462:Solar time
5432:Civil time
4956:Chronemics
4931:Kalachakra
4843:Presentism
4828:Eternalism
4734:Chronology
4672:mechanical
4623:Main types
4541:Main types
3820:Green Book
3772:"SI Units"
3667:January 9,
3636:January 9,
3622:"Units: A"
3315:"Glossary"
3081:"SI units"
3020:References
3003:Millennium
2922:Eukaryotes
2769:Giga years
2745:Mega years
2721:kilo years
2690:Short for
2463:millennium
2442:Definition
2416:See also:
2335:Green Book
2221:branches (
2141:Great Year
1911:Year type
1900:SI seconds
1896:solar days
1645:Tidal drag
1635:precession
1418:among the
1396:epagomenal
1380:Vague year
1357:lunar year
1351:Lunar year
1257:lunar node
1235:perihelion
1071:light-year
1048:SI seconds
1029:See also:
971:trimesters
878:of twelve
860:Hijri year
846:Anno Mundi
801:Common Era
772:assigns a
729:, various
520:vat-sa-ras
470:, such as
386:nominative
230:West Saxon
114:vegetation
98:axial tilt
91:Great Year
61:taken for
6102:Astronomy
5948:Fortnight
5795:Lunisolar
5785:Leap year
5719:Gregorian
5669:stopwatch
5644:Hourglass
5624:Astrarium
5541:Spacetime
5472:Time zone
5349:Metrology
5328:standards
5212:Leap year
5129:Spacetime
5003:Yesterday
4904:Dreamtime
4878:Mythology
4765:Deep time
4677:stopwatch
4652:hourglass
4633:astrarium
4563:Gregorian
4556:Lunisolar
4533:Calendars
4523:Time zone
4396:standards
4314:265440481
4006:April 23,
3980:April 23,
3954:April 28,
3781:April 23,
2943:13.8 bya
2896:0.01 mya
2701:Examples
2670:years ago
2609:half-life
2595:petaannus
2586:red dwarf
2572:teraannus
2555:Cosmology
2542:gigaannus
2519:megaannus
2452:kiloannus
2342:Gold Book
2243:astronomy
2031:(52.1775
2016:Leap year
1392:schematic
1327:full moon
930:Australia
550:"lamb").
546:, Gothic
485:per annum
443:*h₂et-no-
439:*yeh₁-ro-
435:*yeh₁-ro-
427:*yeh₁r-o-
410:*h₂et-no-
300:*yeh₁r-om
277:Old Norse
220:Etymology
190:leap year
122:temperate
18:Years ago
6009:Duration
5983:Saeculum
5963:Olympiad
5805:Solstice
5734:Holocene
5711:Calendar
5611:Horology
5402:ISO 8601
5397:ISO 31-1
5272:Category
5020:Time in
5011:Tomorrow
4873:Religion
4813:Duration
4780:Timeline
4714:Timeline
4513:Sidereal
4381:Eternity
4287:15790499
4204:15071591
3905:96753161
3841:"year".
3826:Archived
3818:, IUPAC
3800:Archived
3755:Archived
3369:Archived
3351:and the
3323:Archived
3296:Archived
3285:Archived
3252:Archived
3233:July 27,
2988:ISO 8601
2961:See also
2933:Big Bang
2894:0.13 mya
2892:0.78 mya
2883:Holocene
2861:Pliocene
2676:("BP").
2629:exaannus
2627:Ea (for
2593:Pa (for
2579:trillion
2570:Ta (for
2540:Ga (for
2517:Ma (for
2495:dating,
2493:ice core
2478:Holocene
2476:for the
2459:thousand
2450:ka (for
2428:megannus
2424:kilannus
2332:(IUPAC)
2325:Red Book
2283:365.2425
2018:in many
1964:365.2425
1939:in many
1781:Eclipse
1775:Sidereal
1772:Tropical
1708:Sidereal
1689:Tropical
1683:Seconds
1641:periods.
1444:ecliptic
1400:Ethiopia
1261:eclipses
1239:aphelion
975:quarters
840:the city
515:Sanskrit
482:, etc.;
460:"goes",
433:suffix,
400:ablative
388:plural;
382:genitive
316:"year",
224:English
178:calendar
146:tropical
126:subpolar
110:daylight
6138:Science
6078:Geology
6064:Portals
5978:Century
5968:Lustrum
5898:Instant
5770:Equinox
5739:Islamic
5681:Sundial
5546:Chronon
5282:Commons
5205:Related
5119:Instant
5109:Chronon
5091:Physics
5031:Geology
5022:science
4894:Destiny
4739:History
4707:History
4662:sundial
4645:quantum
4588:Chinese
4578:Islamic
4488:Decimal
4483:Chinese
4445:systems
4371:Present
4265:Bibcode
4212:4356044
4184:Bibcode
4143:6733875
4123:Bibcode
4076:Bibcode
3937:Bibcode
3699:Bibcode
3511:Bibcode
3424:Bibcode
3138:Bibcode
3136:: 407.
3042:transf.
2973:Century
2941:4.5 bya
2920:Oldest
2885:started
2878:started
2613:nuclide
2611:of the
2549:billion
2526:million
2485:periods
2369:365.242
2262:365.242
2223:geology
2210:(NIST)
2126:weeks.
2095:hours,
2074:hours,
2068:seconds
2055:minutes
2000:365.259
1993:J2000.0
1984:365.256
1957:J2000.0
1948:365.242
1890:Summary
1743:Eclipse
1680:Minutes
1538:365.242
1491:365.256
1414:and in
1412:Armenia
1369:Ramadan
1361:Muslims
1338:411.784
1323:perigee
1272:346.620
1231:apsides
1201:J2000.0
1191:365.256
1129:31.5576
1110:seconds
1084:or the
1076:In the
1050:each ("
985:quarter
702:365.242
691:365.242
676:365.242
645:365.242
638:365.242
614:seconds
597:In the
583:integer
535:vitulus
528:vat-sa-
511:*wetos-
476:annuity
370:is the
311:Avestan
241:Anglian
106:weather
102:seasons
57:is the
5973:Decade
5928:Moment
5923:Minute
5918:Second
5888:Other
5745:Julian
5724:Hebrew
5370:offset
5222:Moment
5217:Memory
5069:period
4657:marine
4640:atomic
4615:Clocks
4573:Hebrew
4568:Julian
4503:Metric
4376:Future
4312:
4302:
4285:
4275:
4210:
4202:
4176:Nature
4141:
4041:
3903:
3479:
3449:
3204:May 9,
3187:
2978:Decade
2955:ad hoc
2781:years)
2706:Event
2685:Non-SI
2620:pascal
2439:Symbol
2340:IUPAC
2323:IUPAP
1974:365.25
1927:Lunar
1924:354.37
1916:346.62
1464:Sirius
1420:Aztecs
1290:18.612
1180:sidera
918:Canada
864:Hijrah
758:Tehran
750:Nowruz
548:wiþrus
540:wether
472:annual
451:*h₂et-
447:*h₁ey-
396:dative
352:Latin
347:hornus
342:, and
309:) are
307:ablaut
284:Gothic
263:German
251:*jǣran
237:/jɛar/
180:. The
142:winter
140:, and
138:autumn
134:summer
130:spring
85:, the
81:, the
6159:Years
6114:Stars
6014:music
5953:Month
5913:Jiffy
5908:Shake
5903:Flick
5800:Solar
5790:Lunar
5765:Epact
5729:Hindu
5664:Watch
5619:Clock
5227:Space
5059:epoch
5049:chron
5007:Today
4976:tempo
4971:Music
4833:Event
4667:watch
4551:Lunar
4546:Solar
4518:Solar
4508:Roman
4498:Hindu
4208:S2CID
4139:S2CID
4113:arXiv
3901:S2CID
3869:(PDF)
3607:(PDF)
3578:(PDF)
3567:(PDF)
3198:(PDF)
3181:(PDF)
3107:(PDF)
3025:Notes
2983:Epoch
2939:2 bya
2928:Earth
2870:The (
2709:Time
2666:years
2505:varve
2394:Guide
2203:annus
2186:month
2044:hours
2033:weeks
1908:Days
1815:−116
1803:−2000
1798:−174
1786:−4000
1677:Hours
1186:sidus
1175:orbit
967:three
922:India
815:. In
778:epoch
670:, or
544:weðer
507:vetus
467:annus
462:atasi
431:*-r/n
420:aþnam
406:noun
367:annum
356:annus
344:Latin
318:Greek
295:noun
228:(via
214:annus
210:Latin
144:. In
120:. In
71:Earth
67:orbit
5958:Year
5943:Week
5933:Hour
5387:DUT1
5326:and
4946:and
4909:Kāla
4604:List
4598:Maya
4394:and
4366:Past
4352:Time
4310:OCLC
4300:ISBN
4283:OCLC
4273:ISBN
4238:2010
4200:PMID
4052:2020
4039:ISBN
4023:"Ga"
4008:2022
3982:2022
3956:2011
3783:2022
3669:2009
3638:2009
3586:2009
3550:2019
3477:ISBN
3447:ISBN
3331:2023
3289:and
3235:2022
3227:UCUM
3206:2018
3185:ISBN
3089:2010
3067:2023
2881:The
2634:One
2607:The
2600:One
2577:One
2547:One
2524:One
2480:and
2457:One
2365:.445
2356:a =
2248:The
2229:), "
2225:and
2151:The
2139:The
2093:8784
2072:8760
2029:days
1883:104
1871:6000
1854:4000
1837:2000
1832:−57
1769:Year
1674:Days
1652:and
1536:) /
1531:.313
1505:The
1493:8983
1478:The
1458:The
1424:Maya
1422:and
1408:Iran
1365:Eids
1355:The
1317:The
1304:.331
1153:and
1137:The
996:four
989:term
987:(or
920:and
658:The
640:2222
628:The
570:lěto
564:godŭ
502:ἔτος
449:and
441:and
398:and
394:the
391:annō
377:annī
340:jarŭ
335:"),
333:hour
328:hṓra
314:yārǝ
282:and
266:Jahr
233:ġēar
226:year
160:and
148:and
124:and
116:and
59:time
55:year
5938:Day
5064:era
5054:eon
5044:age
4423:TAI
4413:UTC
4192:doi
4180:428
4131:doi
4084:doi
4031:doi
3945:doi
3933:210
3891:hdl
3883:doi
3847:doi
3707:doi
3519:doi
3507:428
3420:282
3115:XXB
3038:OED
2904:Gya
2902:bya
2844:Mya
2842:mya
2789:kya
2763:Gyr
2760:byr
2739:Myr
2736:myr
2716:kyr
2503:or
2465:in
2408:).
2371:192
2363:925
2360:556
2314:).
2300:are
2239:byr
2235:myr
2231:kyr
2123:871
2116:097
2114:146
2109:400
2106:622
2099:040
2097:527
2088:000
2085:536
2078:600
2076:525
2064:952
2061:556
2057:or
2050:949
2048:525
2041:.82
2039:765
2012:366
2002:636
1932:365
1877:−12
1874:−35
1866:54
1857:−14
1812:−11
1809:−19
1795:−15
1792:−45
1755:55
1746:346
1738:53
1729:365
1721:10
1712:365
1702:45
1693:365
1591:by
1543:781
1540:198
1529:020
1526:415
1340:430
1306:019
1302:798
1295:932
1292:815
1277:883
1274:075
1207:).
1196:004
1193:363
1120:400
1106:600
1103:557
1065:250
1063:365
1058:525
980:two
973:or
733:).
704:374
700:of
693:189
683:ppm
458:éti
416:aþn
404:PIE
380:is
360:(a
322:ὥρα
288:jer
273:jār
259:ran
244:ġēr
239:),
158:wet
75:Sun
6150::
5382:ΔT
5377:UT
5009:–
5005:–
4418:UT
4308:.
4281:.
4271:.
4206:.
4198:.
4190:.
4178:.
4160:.
4137:.
4129:.
4121:.
4109:67
4107:.
4082:.
4072:76
4070:.
4037:,
3998:.
3972:.
3943:.
3931:.
3925:.
3913:^
3899:.
3889:.
3879:83
3877:.
3871:.
3774:.
3705:.
3695:89
3693:.
3689:.
3677:^
3646:^
3624:.
3594:^
3569:.
3541:.
3517:.
3505:.
3501:.
3418:.
3317:.
3294:.
3283:.
3225:.
3214:^
3134:32
3132:.
3113:.
3109:.
3057:.
2874:)
2772:Ga
2748:Ma
2724:ka
2588:.
2512:.
2499:,
2426:,
2374:65
2358:31
2345:.
2281:=
2264:19
2260:=
2237:,
2233:,
2121:20
2104:31
2083:31
2059:31
2052:.2
2046:,
1986:36
1950:19
1902:.
1880:10
1860:−3
1849:0
1829:−5
1826:−4
1789:−8
1752:52
1749:14
1735:13
1699:48
1557:.
1533:52
1522:−
1520:TT
1450:.
1410:,
1406:,
1402:,
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1205:TT
1170:.
1132:Ms
1127:=
1118:86
1112:.
1101:31
1073:.
1056:36
908:A
866:,
830:,
768:A
647:19
478:,
474:,
374:;
280:ár
275:,
268:,
257:ē₁
255:*j
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172:A
136:,
132:,
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4289:.
4267::
4240:.
4214:.
4194::
4186::
4145:.
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4125::
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4090:.
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4078::
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4010:.
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3939::
3907:.
3893::
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3761:.
3713:.
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3671:.
3640:.
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3513::
3485:.
3461:.
3455:.
3430:.
3426::
3333:.
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3208:.
3144:.
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2777:(
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2454:)
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2295:j
2289:;
2279:g
2277:a
2272:j
2270:a
2258:t
2256:a
2037:8
1863:5
1846:0
1843:0
1840:0
1823:7
1820:0
1806:4
1732:6
1718:9
1715:6
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1599:(
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1524:2
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1125:j
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559:秂
555:年
325:(
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