1382:
1960:
1376:
1157:
1167:
157:
169:
1280:
1203:
46:
this usage has generally fallen out of favor, in order to avoid confusion with more conventional timekeeping. An astronomical day can also refer to one rotation of
1196:
2001:
1734:
1189:
766:
602:
231:
1703:
1454:
716:
371:
1527:
595:
1708:
1994:
678:
1663:
1643:
1589:
1474:
1310:
969:
881:
1330:
1315:
1253:
1232:
321:
301:
1484:
1295:
1032:
761:
311:
224:
42:
Astronomical days were historically used by astronomers (in contrast most commonly to solar days), but since the
2030:
731:
1987:
1744:
1522:
1424:
1340:
1335:
987:
638:
341:
1897:
802:
747:
701:
686:
331:
43:
2020:
1724:
1638:
1464:
1325:
1053:
1022:
471:
366:
217:
165:
108:
1934:
1729:
1584:
1449:
1401:
1270:
927:
386:
346:
71:
1909:
1683:
1607:
1537:
876:
854:
721:
545:
516:
451:
444:
191:
137:
1757:
1622:
1439:
957:
836:
736:
589:
492:
396:
1971:
1170:
1902:
1648:
1627:
1579:
1542:
1355:
1075:
1063:
891:
859:
691:
560:
476:
466:
381:
116:
1959:
1633:
1612:
1444:
1416:
1137:
1002:
979:
947:
899:
886:
849:
831:
461:
456:
112:
1929:
1688:
1678:
1617:
1574:
1406:
1396:
1365:
1265:
1237:
1080:
1070:
869:
741:
711:
696:
481:
439:
434:
306:
2014:
1816:
1767:
1752:
1698:
1469:
1305:
1300:
1216:
1160:
1110:
1058:
992:
964:
952:
942:
932:
814:
658:
584:
533:
486:
401:
361:
356:
351:
284:
67:
2025:
1914:
1801:
1796:
1791:
1778:
1517:
1132:
1126:
792:
726:
648:
579:
528:
376:
316:
36:
1181:
1924:
1919:
1564:
1547:
1479:
1459:
1345:
1227:
1142:
1120:
1027:
1012:
807:
787:
777:
706:
663:
643:
572:
391:
293:
194:. Institute for History and Foundations of Mathematics and the Natural Sciences
1939:
1892:
1876:
1762:
1668:
1489:
1350:
1320:
1258:
1037:
937:
844:
819:
622:
406:
1967:
1836:
1673:
1557:
1532:
1512:
1429:
1381:
1375:
1360:
1100:
1017:
653:
565:
540:
521:
411:
32:
1871:
1851:
1693:
1599:
1499:
1290:
1285:
668:
429:
421:
279:
269:
28:
136:
Finkleman, David (2011). "The Future of Time: UTC and the Leap Second".
1866:
1856:
1786:
1658:
1569:
1434:
1007:
997:
919:
910:
895:
797:
782:
627:
550:
259:
1861:
1811:
1806:
1105:
264:
23:
refers to a length of day of exactly or nearly 24 hours beginning at
158:"Logbooks of the Bologna astronomical Observatory for the year 1761"
121:
96:
1841:
1653:
1552:
1507:
1115:
864:
555:
511:
503:
142:
47:
31:. The exact length has been variously defined as either that of a
1846:
1831:
1821:
1275:
1212:
254:
240:
90:
88:
24:
1185:
213:
1826:
1281:
International Earth
Rotation and Reference Systems Service
1975:
209:
101:
1885:
1776:
1743:
1717:
1598:
1498:
1415:
1389:
1246:
1093:
1046:
978:
918:
908:
830:
757:
677:
618:
502:
420:
330:
292:
278:
247:
50:or any other planet depending on its spin speed.
1995:
1197:
225:
8:
2002:
1988:
1204:
1190:
1182:
915:
289:
232:
218:
210:
141:
120:
1735:International Commission on Stratigraphy
97:"The Beginning of the Astronomical Day"
59:
16:Length of day from Noon, not midnight
7:
1956:
1954:
1166:
1974:. You can help Knowledge (XXG) by
14:
1455:Discrete time and continuous time
1958:
1380:
1374:
1165:
1156:
1155:
192:"Transit of Venus Bibliography"
1528:History of timekeeping devices
1:
1475:Gravitational time dilation
1311:Barycentric Coordinate Time
970:Geological history of Earth
2047:
1953:
1331:Geocentric Coordinate Time
1316:Barycentric Dynamical Time
1254:Coordinated Universal Time
322:Orders of magnitude (time)
1485:Time-translation symmetry
1372:
1296:International Atomic Time
1223:
1151:
1033:Time translation symmetry
1745:Astronomical chronology
1718:Archaeology and geology
1425:Absolute space and time
1341:IERS Reference Meridian
1336:International Date Line
1247:International standards
988:Absolute space and time
639:Astronomical chronology
95:Campbell, W.W. (1918).
1970:-related article is a
1038:Time reversal symmetry
342:Italian six-hour clock
1704:Weekday determination
1590:Sundial markup schema
803:Time and fate deities
748:The Unreality of Time
687:A series and B series
44:Industrial Revolution
1725:Chronological dating
1465:Theory of relativity
1326:Daylight saving time
1054:Chronological dating
1023:Theory of relativity
367:Daylight saving time
166:University of Oxford
1935:Time value of money
1730:Geologic time scale
1585:History of sundials
1450:Cosmological decade
1402:Greenwich Mean Time
1233:Orders of magnitude
347:Thai six-hour clock
113:1918PASP...30..358C
72:The Free Dictionary
1910:Mental chronometry
1538:Marine chronometer
1390:Obsolete standards
877:Rosy retrospection
855:Mental chronometry
679:Philosophy of time
68:"Astronomical day"
1983:
1982:
1948:
1947:
1758:Nuclear timescale
1440:Continuous signal
1179:
1178:
1089:
1088:
1064:Circadian rhythms
882:Tense–aspect–mood
737:Temporal finitism
614:
613:
590:Grandfather clock
162:Transits of Venus
2038:
2004:
1997:
1990:
1962:
1955:
1649:Dominical letter
1580:Equation of time
1543:Marine sandglass
1384:
1378:
1356:Terrestrial Time
1213:Time measurement
1206:
1199:
1192:
1183:
1169:
1168:
1159:
1158:
1076:Glottochronology
916:
832:Human experience
692:B-theory of time
290:
234:
227:
220:
211:
204:
203:
201:
199:
188:
182:
181:
179:
177:
168:. Archived from
154:
148:
147:
145:
133:
127:
126:
124:
92:
83:
82:
80:
78:
64:
21:astronomical day
2046:
2045:
2041:
2040:
2039:
2037:
2036:
2035:
2031:Astronomy stubs
2011:
2010:
2009:
2008:
1951:
1949:
1944:
1881:
1772:
1739:
1713:
1594:
1494:
1445:Coordinate time
1417:Time in physics
1411:
1385:
1379:
1370:
1242:
1219:
1210:
1180:
1175:
1147:
1138:Time immemorial
1085:
1042:
1003:Coordinate time
974:
928:Geological time
904:
887:Time management
850:Generation time
834:
826:
771:
753:
673:
632:
610:
498:
416:
333:
326:
282:
274:
243:
238:
208:
207:
197:
195:
190:
189:
185:
175:
173:
172:on 4 March 2016
156:
155:
151:
135:
134:
130:
94:
93:
86:
76:
74:
66:
65:
61:
56:
17:
12:
11:
5:
2044:
2042:
2034:
2033:
2028:
2023:
2013:
2012:
2007:
2006:
1999:
1992:
1984:
1981:
1980:
1963:
1946:
1945:
1943:
1942:
1937:
1932:
1930:Time metrology
1927:
1922:
1917:
1912:
1907:
1906:
1905:
1895:
1889:
1887:
1886:Related topics
1883:
1882:
1880:
1879:
1874:
1869:
1864:
1859:
1854:
1849:
1844:
1839:
1834:
1829:
1824:
1819:
1814:
1809:
1804:
1799:
1794:
1789:
1783:
1781:
1774:
1773:
1771:
1770:
1765:
1760:
1755:
1749:
1747:
1741:
1740:
1738:
1737:
1732:
1727:
1721:
1719:
1715:
1714:
1712:
1711:
1706:
1701:
1696:
1691:
1686:
1681:
1676:
1671:
1666:
1661:
1656:
1651:
1646:
1641:
1636:
1631:
1625:
1620:
1615:
1610:
1604:
1602:
1596:
1595:
1593:
1592:
1587:
1582:
1577:
1575:Dialing scales
1572:
1567:
1562:
1561:
1560:
1550:
1545:
1540:
1535:
1530:
1525:
1520:
1515:
1510:
1504:
1502:
1496:
1495:
1493:
1492:
1487:
1482:
1477:
1472:
1467:
1462:
1457:
1452:
1447:
1442:
1437:
1432:
1427:
1421:
1419:
1413:
1412:
1410:
1409:
1407:Prime meridian
1404:
1399:
1397:Ephemeris time
1393:
1391:
1387:
1386:
1373:
1371:
1369:
1368:
1366:180th meridian
1363:
1358:
1353:
1348:
1343:
1338:
1333:
1328:
1323:
1318:
1313:
1308:
1303:
1298:
1293:
1288:
1283:
1278:
1273:
1268:
1263:
1262:
1261:
1250:
1248:
1244:
1243:
1241:
1240:
1235:
1230:
1224:
1221:
1220:
1211:
1209:
1208:
1201:
1194:
1186:
1177:
1176:
1174:
1173:
1163:
1152:
1149:
1148:
1146:
1145:
1140:
1135:
1130:
1123:
1118:
1113:
1108:
1103:
1097:
1095:
1091:
1090:
1087:
1086:
1084:
1083:
1081:Time geography
1078:
1073:
1071:Clock reaction
1068:
1067:
1066:
1056:
1050:
1048:
1044:
1043:
1041:
1040:
1035:
1030:
1025:
1020:
1015:
1010:
1005:
1000:
995:
990:
984:
982:
976:
975:
973:
972:
967:
962:
961:
960:
955:
950:
945:
940:
935:
924:
922:
913:
906:
905:
903:
902:
889:
884:
879:
874:
873:
872:
870:time signature
867:
857:
852:
847:
841:
839:
828:
827:
825:
824:
823:
822:
812:
811:
810:
800:
795:
790:
785:
780:
774:
772:
770:
769:
764:
758:
755:
754:
752:
751:
744:
742:Temporal parts
739:
734:
729:
724:
719:
714:
712:Eternal return
709:
704:
699:
697:Chronocentrism
694:
689:
683:
681:
675:
674:
672:
671:
666:
661:
656:
651:
646:
641:
635:
633:
631:
630:
625:
619:
616:
615:
612:
611:
609:
608:
607:
606:
592:
587:
582:
577:
576:
575:
570:
569:
568:
563:
553:
548:
543:
538:
537:
536:
526:
525:
524:
508:
506:
500:
499:
497:
496:
489:
484:
482:Hindu Panchang
479:
474:
469:
464:
459:
454:
449:
448:
447:
442:
437:
426:
424:
418:
417:
415:
414:
409:
404:
399:
394:
389:
384:
379:
374:
369:
364:
359:
354:
349:
344:
338:
336:
328:
327:
325:
324:
319:
314:
309:
304:
298:
296:
287:
276:
275:
273:
272:
267:
262:
257:
251:
249:
245:
244:
239:
237:
236:
229:
222:
214:
206:
205:
183:
149:
128:
122:10.1086/122784
84:
58:
57:
55:
52:
27:instead of at
15:
13:
10:
9:
6:
4:
3:
2:
2043:
2032:
2029:
2027:
2024:
2022:
2019:
2018:
2016:
2005:
2000:
1998:
1993:
1991:
1986:
1985:
1979:
1977:
1973:
1969:
1964:
1961:
1957:
1952:
1941:
1938:
1936:
1933:
1931:
1928:
1926:
1923:
1921:
1918:
1916:
1913:
1911:
1908:
1904:
1901:
1900:
1899:
1896:
1894:
1891:
1890:
1888:
1884:
1878:
1875:
1873:
1870:
1868:
1865:
1863:
1860:
1858:
1855:
1853:
1850:
1848:
1845:
1843:
1840:
1838:
1835:
1833:
1830:
1828:
1825:
1823:
1820:
1818:
1815:
1813:
1810:
1808:
1805:
1803:
1800:
1798:
1795:
1793:
1790:
1788:
1785:
1784:
1782:
1780:
1779:units of time
1775:
1769:
1768:Sidereal time
1766:
1764:
1761:
1759:
1756:
1754:
1753:Galactic year
1751:
1750:
1748:
1746:
1742:
1736:
1733:
1731:
1728:
1726:
1723:
1722:
1720:
1716:
1710:
1709:Weekday names
1707:
1705:
1702:
1700:
1699:Tropical year
1697:
1695:
1692:
1690:
1687:
1685:
1682:
1680:
1677:
1675:
1672:
1670:
1667:
1665:
1664:Intercalation
1662:
1660:
1657:
1655:
1652:
1650:
1647:
1645:
1642:
1640:
1637:
1635:
1632:
1630:(lunar Hijri)
1629:
1626:
1624:
1621:
1619:
1616:
1614:
1611:
1609:
1606:
1605:
1603:
1601:
1597:
1591:
1588:
1586:
1583:
1581:
1578:
1576:
1573:
1571:
1568:
1566:
1563:
1559:
1556:
1555:
1554:
1551:
1549:
1546:
1544:
1541:
1539:
1536:
1534:
1531:
1529:
1526:
1524:
1521:
1519:
1516:
1514:
1511:
1509:
1506:
1505:
1503:
1501:
1497:
1491:
1488:
1486:
1483:
1481:
1478:
1476:
1473:
1471:
1470:Time dilation
1468:
1466:
1463:
1461:
1458:
1456:
1453:
1451:
1448:
1446:
1443:
1441:
1438:
1436:
1433:
1431:
1428:
1426:
1423:
1422:
1420:
1418:
1414:
1408:
1405:
1403:
1400:
1398:
1395:
1394:
1392:
1388:
1383:
1377:
1367:
1364:
1362:
1359:
1357:
1354:
1352:
1349:
1347:
1344:
1342:
1339:
1337:
1334:
1332:
1329:
1327:
1324:
1322:
1319:
1317:
1314:
1312:
1309:
1307:
1306:24-hour clock
1304:
1302:
1301:12-hour clock
1299:
1297:
1294:
1292:
1289:
1287:
1284:
1282:
1279:
1277:
1274:
1272:
1269:
1267:
1264:
1260:
1257:
1256:
1255:
1252:
1251:
1249:
1245:
1239:
1236:
1234:
1231:
1229:
1226:
1225:
1222:
1218:
1214:
1207:
1202:
1200:
1195:
1193:
1188:
1187:
1184:
1172:
1164:
1162:
1154:
1153:
1150:
1144:
1141:
1139:
1136:
1134:
1131:
1129:
1128:
1124:
1122:
1119:
1117:
1114:
1112:
1109:
1107:
1104:
1102:
1099:
1098:
1096:
1092:
1082:
1079:
1077:
1074:
1072:
1069:
1065:
1062:
1061:
1060:
1059:Chronobiology
1057:
1055:
1052:
1051:
1049:
1045:
1039:
1036:
1034:
1031:
1029:
1026:
1024:
1021:
1019:
1016:
1014:
1011:
1009:
1006:
1004:
1001:
999:
996:
994:
993:Arrow of time
991:
989:
986:
985:
983:
981:
977:
971:
968:
966:
965:Geochronology
963:
959:
956:
954:
951:
949:
946:
944:
941:
939:
936:
934:
931:
930:
929:
926:
925:
923:
921:
917:
914:
912:
907:
901:
897:
893:
890:
888:
885:
883:
880:
878:
875:
871:
868:
866:
863:
862:
861:
858:
856:
853:
851:
848:
846:
843:
842:
840:
838:
833:
829:
821:
818:
817:
816:
815:Wheel of time
813:
809:
806:
805:
804:
801:
799:
796:
794:
791:
789:
786:
784:
781:
779:
776:
775:
773:
768:
765:
763:
760:
759:
756:
750:
749:
745:
743:
740:
738:
735:
733:
730:
728:
725:
723:
720:
718:
715:
713:
710:
708:
705:
703:
700:
698:
695:
693:
690:
688:
685:
684:
682:
680:
676:
670:
667:
665:
662:
660:
659:Periodization
657:
655:
652:
650:
647:
645:
642:
640:
637:
636:
634:
629:
626:
624:
621:
620:
617:
605:
604:
600:
599:
598:
597:
593:
591:
588:
586:
585:Digital clock
583:
581:
578:
574:
571:
567:
564:
562:
559:
558:
557:
554:
552:
549:
547:
544:
542:
539:
535:
532:
531:
530:
527:
523:
520:
519:
518:
515:
514:
513:
510:
509:
507:
505:
501:
495:
494:
490:
488:
485:
483:
480:
478:
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1644:Astronomical
1523:Complication
1518:Atomic clock
1133:Time capsule
1127:Tempus fugit
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1047:Other fields
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727:Perdurantism
649:Calendar era
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580:Cuckoo clock
517:astronomical
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317:Unit of time
248:Key concepts
196:. Retrieved
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2021:Time scales
1925:System time
1920:Metric time
1639:Solar Hijri
1565:Water clock
1548:Radio clock
1480:Time domain
1460:Proper time
1346:Leap second
1228:Chronometry
1143:Time travel
1121:System time
1028:Time domain
1013:Proper time
837:use of time
808:Father Time
788:Immortality
778:Ages of Man
707:Endurantism
664:Regnal year
644:Big History
573:water-based
472:Solar Hijri
382:Hexadecimal
332:Measurement
294:Chronometry
280:Measurement
2015:Categories
1940:Timekeeper
1893:Chronology
1877:Millennium
1763:Precession
1669:Julian day
1490:T-symmetry
1351:Solar time
1321:Civil time
845:Chronemics
820:Kalachakra
732:Presentism
717:Eternalism
623:Chronology
561:mechanical
512:Main types
430:Main types
54:References
1968:astronomy
1837:Fortnight
1684:Lunisolar
1674:Leap year
1608:Gregorian
1558:stopwatch
1533:Hourglass
1513:Astrarium
1430:Spacetime
1361:Time zone
1238:Metrology
1217:standards
1101:Leap year
1018:Spacetime
892:Yesterday
793:Dreamtime
767:Mythology
654:Deep time
566:stopwatch
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522:astrarium
452:Gregorian
445:Lunisolar
422:Calendars
412:Time zone
285:standards
198:29 August
176:29 August
143:1106.3141
33:solar day
1898:Duration
1872:Saeculum
1852:Olympiad
1694:Solstice
1623:Holocene
1600:Calendar
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1291:ISO 8601
1286:ISO 31-1
1161:Category
909:Time in
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762:Religion
702:Duration
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603:Timeline
402:Sidereal
270:Eternity
77:1 August
35:or of a
29:midnight
1867:Century
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1787:Instant
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1628:Islamic
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1008:Instant
998:Chronon
980:Physics
920:Geology
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783:Destiny
628:History
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551:sundial
534:quantum
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467:Islamic
377:Decimal
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334:systems
260:Present
109:Bibcode
1862:Decade
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1259:offset
1111:Moment
1106:Memory
958:period
546:marine
529:atomic
504:Clocks
462:Hebrew
457:Julian
392:Metric
265:Future
1966:This
1903:music
1842:Month
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1797:Shake
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1689:Solar
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1654:Epact
1618:Hindu
1553:Watch
1508:Clock
1116:Space
948:epoch
938:chron
896:Today
865:tempo
860:Music
722:Event
556:watch
440:Lunar
435:Solar
407:Solar
397:Roman
387:Hindu
138:arXiv
48:Earth
1972:stub
1847:Year
1832:Week
1822:Hour
1276:DUT1
1215:and
835:and
798:Kāla
493:List
487:Maya
283:and
255:Past
241:Time
200:2013
178:2013
79:2013
25:noon
2026:Day
1827:Day
953:era
943:eon
933:age
312:TAI
302:UTC
117:doi
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1266:UT
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