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of those, preferentially uses the clocks that currently conform reliably to the time reports of the majority. It is the combined ‘vote’ of the ensemble that constitutes the otherwise-fictitious “Master Clock”. The time-scale computations on 7 June 2007 weighted 70 of the clocks into the standard.
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The clocks used for the USNO timescale are kept in 19 environmental chambers, whose temperatures are kept constant to within 0.1°C. The relative humidities are kept constant in all maser, and most cesiums enclosures, to within 1%. Time-scale management only uses the clocks in
Washington, DC, and
725:, after adjustments, of 8.809″, with a probable error of 0.0059″, yielding a U.S.-determined Earth-Sun distance of 92,797,000 mi (149,342,000 km), with a probable error of 59,700 mi (96,100 km). The calculated distance was a significant improvement over several previous estimates.
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The USNO has conducted significant scientific studies throughout its history, including measuring the speed of light, observing solar eclipses, and discovering the moons of Mars. Its achievements including providing data for the first radio time signals, constructing some of the earliest and most
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These different names for the observatory, and the term 'Hydrographic Office', were used interchangeably until
December 1854, when the Secretary of the Navy officially ruled that the proper designation was "The United States Naval Observatory and Hydrographical
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The site houses the largest astronomy library in the United States (and the largest astrophysical periodicals collection in the world). The library includes a large collection of rare physics and astronomy books from the past millennium.
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The voice announcements always begin with the local time (daylight or standard), and include a background of 1 second ticks. Local time announcements are made on the minute, and 15, 30, and 45 seconds after the minute.
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was put in charge of "obtaining the instruments needed and books." Lt. Gilliss visited the principal observatories of Europe with the mission to purchase telescopes and other scientific devices, and books.
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in 1874, and 1,380 measurable plates in 1882. The results of the surveys conducted simultaneously from several locations around the world (for each of the two transits) produced a final value of the
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Transcription: Lieut. Matthew
Fontaine Maury’s 1847 Letter to President John Quincy Adams on the many details of the United States National Observatory that was later called the "Navy" Observatory
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Adams had made protracted efforts to bring astronomy to a national level. He spent many nights at the observatory, watching and charting the stars, which had always been one of his interests.
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was officially made autonomous as an
Echelon 5 command, separate from, but still reporting to the USNO in Washington. In the alpine woodlands above 7,000 feet altitude outside
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for the U.S. Observatory. Placed into service in 1845, it was the first time ball in the United States and the 12th in the world. Maury kept accurate time by the stars and planets.
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1142:(UTC) is announced 5 seconds after the local time. Upon connecting, only the second-marking ticks are heard for the few seconds before the next scheduled local time announcement
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In 1934, the largest optical telescope installed at USNO saw "first light". This 40 inch aperture instrument was also the second (and final) telescope made by famed optician,
871:, and celestial observation. In collaboration with many national and international scientific establishments, it determines the timing and astronomical data required for accurate
852:, exchanged sustained wireless (radio) signals with the U.S. Naval Observatory to determine the exact difference of longitude between the two institutions, via an antenna in
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between the Sun and the Earth. This was conducted under the auspices of the congressionally-funded U.S. Transit of Venus
Commission. The astronomical measurements taken of the
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In 1893, the observatory moved to its current location in
Northwest Washington, D.C. located on a 2000 foot circle of land atop "Observatory Hill", overlooking
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to schedule
American rail transport. Early in the 20th century, the service was broadcast by radio, with Arlington time signal available to those with
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The names "National
Observatory" and "Naval Observatory" were both used for 10 years, until the Secretary of the Navy officially adopted the latter.
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on 6 December 1830 as the Depot of Charts and
Instruments, the Observatory rose from humble beginnings: Placed under the command of Lieutenant
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The United States Naval
Observatory Instrument shop has been designing and manufacturing precise instrumentation since the early 1900s.
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until 1994, when the department was abolished and its functions transferred to a group within the Astronomical Applications Department.
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795:(NOFS), was established there. Those operations began in 1955. Within a decade, the Navy's largest telescope, the 61 inch "
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A house situated on the grounds of the observatory, at Number One Observatory Circle, has been the official residence of the
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It was established as a national observatory in 1842 by federal law and a Congressional appropriation of $ 25,000. Lt.
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Before serving as the vice president's residence, it was that of the observatory's superintendent, and later the
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On 20 September 1894, the NAO became a "branch" of USNO; however, it remained autonomous for several years.
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The U.S. Naval Observatory operates two “Master Clock” facilities, one in Washington, DC, and the other at
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An early scientific duty assigned to the Observatory was the U.S. contribution to the definition of the
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Alden, Henry Mills; Wells, Thomas Bucklin; Hartman, Lee Foster; Allen, Frederick Lewis (March 1874).
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By the early 1870s the USNO daily noon-time signal was distributed electrically, nationwide, via the
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The time ball was dropped every day except Sunday, precisely at the astronomically defined moment of
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The USNO also operates a modem time service, and provides time to the Global Positioning System.
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performs its national, Celestial Reference Frame (CRF) mission under dark skies in that region.
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by a number of countries since 1639 resulted in a progressively more accurate definition of the
2711:"Observatories in the United States: [Section] II.—The United States Naval Observatory"
2015:
1392:. State Historic Preservation Office, D.C. Office of Planning. 30 September 2009. p. 107.
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The voice of actor Fred Covington (1928–1993) has been announcing the USNO time since 1978.
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10. The observatory plans to build several more of this type for use at its two facilities.
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The U.S. Naval Observatory in Washington continues to be a major authority in the areas of
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2422:"U.S. Naval Observatory declares full operational capability for rubidium fountain clocks"
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Telegraph Company. Time was also "sold" to the railroads and was used in conjunction with
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Matsakis, Demetrios; et al. (Civil GPS Service Interface Committee) (2010-09-20).
2203:. Naval Oceanography Portal. Naval Meteorology and Oceanography Command. Archived from
1909:. Naval Oceanography Portal. Naval Meteorology and Oceanography Command. Archived from
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1454:. Naval Oceanography Portal. Naval Meteorology and Oceanography Command. Archived from
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Aside from its scientific mission, since the 1970s the Naval Observatory campus hosts
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to ring the alarm bells in all of the Washington, D.C. firehouses three times a day.
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1419:"National Executive Committee for Space-Based Positioning, Navigation, and Timing"
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Relying strongly on photographic methods, the naval observers returned 350
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Astronomical and Meteorological Observations made at the U.S. Naval Observatory
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The USNO held a one-off time-ball re-enactment for the year-2000 celebration.
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Williams, Frances Leigh (1963). "VIII. Scientific opportunity at last".
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2682:"U.S. Naval Observatory Special Publications — Naval Oceanography Portal"
2232:. Naval Oceanography Portal. Naval Meteorology and Oceanography Command.
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Radio stations WWV, WWVH, and WWVB – NIST time & frequency broadcast
254:
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1693:
Guide to Federal Records in the National Archives of the United States
1589:
Dick, S.J. (1991). "The origins of the Dominion Observatory, Ottawa".
1509:"A Brief History of the Naval Observatory — Naval Oceanography Portal"
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since 1974. It is protected by tight security control enforced by the
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President, Columbian Institute for the Promotion of Arts and Sciences
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Astrometric Reflector" was built; it saw light at Flagstaff in 1964.
745:, Washington, DC. In 1893 it was moved to its Northwest DC location.
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Adde gubernandi studium: Pervenit in astra, et pontum caelo conjunxit
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The U.S. Naval Observatory provides public time service via 26
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optical design for nearly all major telescopes, including the famed
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in 1877; the telescope is shown at its modern Northwest DC location.
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near the city's center, to its Northwest Washington, D.C. location.
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House Armed Services Subcommittee on Seapower and Projection Forces
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926:. The alternate Master Clock time service continues to operate at
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1696:. Washington, DC: National Archives and Records Administration.
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2101:. U.S. Naval Observatory Flagstaff. 2001-05-24. Archived from
2043:. U.S. Naval Observatory Flagstaff. 1998-01-25. Archived from
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In 1849, the Nautical Almanac Office (NAO) was established in
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Buildings of the United States government in Washington, D.C.
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Official residence of the vice president of the United States
513:
The 26 inch (66 cm) aperture telescope, with which
75:
An aerial view of the United States Naval Observatory in 2004
1933:"The American Transit of Venus Expeditions of 1874 and 1882"
1574:. New Brunswick, NJ: Rutgers University Press. p. 164.
1177:
Astronomical Observations made at the U.S. Naval Observatory
1051:
The primary facility, in Washington, D.C. maintains 57
2158:. Stanford, Calif: Stanford University Press. p. 199.
1879:
Sky and Ocean Joined: The U.S. Naval Observatory, 1830–2000
914:" service that the USNO still operates, and which provides
291:
Naval Observatory Historic District (New Naval Observatory)
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Sky and Ocean Joined: The U.S. Naval Observatory 1830–2000
2726:
Sky and Ocean Joined: The U.S. Naval Observatory 1830–2000
1540:
Sky and Ocean Joined: The U.S. Naval Observatory 1830-2000
442:
located in an urban area. In 1893, in an effort to escape
5169:
National Register of Historic Places in Washington, D.C.
1480:"USNO — Our Command History — Naval Oceanography Portal"
961:
In 2010, USNO's astronomical 'department' known as the
454:
accurate telescopes of their kind, and helping develop
1815:"Weekly list of actions, 12/20/2016 through 1/13/2017"
571:
The observatory's primary mission was to care for the
5024:
1975:"Telescope: Naval Observatory 26 inch refractor"
1881:. Cambridge University Press. pp. 547–548, 574.
1634:"John Quincy Adams' rhetorical crusade for astronomy"
1418:
1010:. The house is separated from the Naval Observatory.
670:
as a separate organization. In 1866, it was moved to
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Uniformed Services University of the Health Sciences
1078:, maintains 12 cesium clocks and 3 masers.
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Office a division in Astronomical Applications. The
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2719:. Vol. XLVIII, no. 286. pp. 531–539.
2568:"Keeping time by rubidium at the Naval Observatory"
1938:
Proceedings of the International Astronomical Union
1035:
Atomic clock ensemble at the U.S. Naval Observatory
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1383:"District of Columbia Inventory of Historic Sites"
1778:Monthly Notices of the Royal Astronomical Society
1316:time service radio stations WWV, WWVH, & WWVB
40:United States Naval Observatory Flagstaff Station
4554:President, American Academy of Arts and Sciences
2447:Initial Evaluation of the USNO Rubidium Fountain
1872:
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133:
103:
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2307:American Astronomical Society Meeting Abstracts
2284:"USNO Master Clock — Naval Oceanography Portal"
1425:. U.S. Government Printing Office. 2011-06-17.
1296:Naval Observatory Vector Astrometry Subroutines
1197:Observations made at the U.S. Naval Observatory
787:, USNO relocated the 40 inch telescope to
579:, charts, and other navigational equipment. It
5149:Astronomical observatories in Washington, D.C.
2536:"The timekeeper behind America's master clock"
2124:"Navy Precision Optical Interferometer (NPOI)"
1839:Nemiroff, R.; Bonnell, J., eds. (1999-10-29).
4299:
4043:
3169:Naval Aviation Warfighting Development Center
2809:
8:
3129:Naval Facilities Engineering Systems Command
2680:Naval Meteorology and Oceanography Command.
1773:"The new U.S. Naval Observatory, Washington"
1572:Matthew Fontaine Maury: Scientist of the Sea
1104:US Naval Observatory outside display of the
887:— and distributes this information (such as
733:The telescope used for the discovery of the
729:The 26 inch and 40 inch refractors
629:The first superintendent was Navy Commander
2344:"The Vice-President's residence and office"
2261:. Naval Oceanography Portal. Archived from
617:In 2017, the facilities were listed on the
364:The Seal of the USNO with a quote from the
201:official residence of the US Vice President
49:Naval Support Facility US Naval Observatory
31:"USNO" redirects here. For other uses, see
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4292:
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4256:
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4017:United States battleship retirement debate
3767:United States Armed Forces School of Music
3484:
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3159:Naval Meteorology and Oceanography Command
3031:
2816:
2802:
2794:
2004:"The 26-inch "Great Equatorial" Refractor"
1207:Publications of the U.S. Naval Observatory
963:Naval Observatory Flagstaff Station (NOFS)
942:In 1990 two departments were established:
270:
45:
4580:Massachusetts Historical Society holdings
3139:Naval Information Warfare Systems Command
3068:Naval Forces Europe – Naval Forces Africa
1958:
1798:
1120:, and via telephone voice announcements:
1089:clocks, which have a stability reaching 7
891:) on-line and in the annual publications
54:Part of Naval Support Activity Washington
4642:United First Parish Church and gravesite
2782:Old photographs at the Paris Observatory
2728:. New York: Cambridge University Press.
2072:. USNO Flagstaff Station. Archived from
946:and Astronomical Applications, with the
5164:1830 establishments in Washington, D.C.
5031:
2037:"1.0 m Ritchey-Chretien Reflector"
1374:
458:. The Naval Observatory performs radio
438:. It is among the few pre-20th century
4728:Monroe Doctrine Centennial half dollar
2887:Master Chief Petty Officer of the Navy
2387:Report from the U.S. Naval Observatory
2226:"Interactive catalog and image search"
1725:. The James Melville Gilliss Library.
1130:+1 719 567-6742 (Colorado Springs, CO)
27:Scientific agency in the United States
3093:Operational Test and Evaluation Force
1690:Matchette, R.B.; et al. (1995).
1166:Navy Precision Optical Interferometer
816:Navy Precision Optical Interferometer
791:. A new Navy command, now called the
286:
277:
7:
5139:Vice presidency of the United States
4269:Coast Guard Station Washington, D.C.
3154:Naval Education and Training Command
1903:"The James Melville Gilliss Library"
1591:Journal for the History of Astronomy
1474:
1472:
619:National Register of Historic Places
474:with numerous global collaborators (
320:(as Depot of Charts and Instruments)
4385:U.S. Minister to the United Kingdom
2452:. U.S. Naval Observatory (Report).
2303:"Nautical Almanac Office 1975–1996"
2095:"1.55 m Astrometric Reflector"
1399:from the original on 1 October 2020
1082:The observatory also operates four
1004:vice president of the United States
752:Naval Observatory Flagstaff Station
640:, created to his specifications by
540:United States Secretary of the Navy
499:vice president of the United States
410:United States Department of Defense
4615:John Quincy Adams and abolitionism
3450:Unclassified miscellaneous vessels
2548:from the original on 16 April 2021
1284:Technology and technical resources
1267:List of astronomical observatories
737:was the 26 inch (66 cm)
583:ships' chronometers by timing the
25:
4718:Adams House at Harvard University
4125:Marine Barracks, Washington, D.C.
1979:Space Telescope Science Institute
814:. This facility now oversees the
5106:
5094:
5082:
5070:
5058:
5046:
5034:
5008:
5007:
4477:State of the Union Address, 1825
4457:First Treaty of Prairie du Chien
4417:U.S. Minister to the Netherlands
4377:United States Secretary of State
4154:Naval Support Facility Anacostia
4099:
2940:
2845:
2844:
2825:
1931:Dick, Steven J. (23 May 2005) .
1217:U.S. Naval Observatory Circulars
1127:+1 202 762-1069 (Washington, DC)
1124:+1 202 762-1401 (Washington, DC)
390:scientific and military facility
281:D.C. Inventory of Historic Sites
132:
125:
102:
95:
81:
69:
5129:United States Naval Observatory
4472:United States Naval Observatory
4401:U.S. Senator from Massachusetts
2932:Senate Subcommittee on Seapower
2688:from the original on 2011-07-26
2662:from the original on 2018-11-08
2632:from the original on 2017-12-27
2607:from the original on 2021-01-22
2578:from the original on 2015-03-29
2517:from the original on 2023-07-01
2428:from the original on 2015-09-22
2403:from the original on 2011-06-14
2358:from the original on 2023-10-28
2325:from the original on 2013-03-09
2236:from the original on 2011-07-26
2136:from the original on 2009-12-15
1985:from the original on 2013-10-18
1841:"The USNO millennium time ball"
1821:from the original on 2017-01-25
1753:. 14 December 1842. p. 1.
1729:from the original on 2021-01-24
1700:from the original on 2017-12-03
1672:from the original on 2020-09-27
1519:from the original on 2022-03-28
1490:from the original on 2021-12-09
1429:from the original on 2011-07-30
802:USNO continues to maintain its
685:Measuring the astronomical unit
414:Depot of Charts and Instruments
382:United States Naval Observatory
354:United States Naval Observatory
4620:Adams National Historical Park
4585:Adams Papers Editorial Project
4492:Federal judiciary appointments
4366:President of the United States
3199:Bureau of Medicine and Surgery
2882:Vice Chief of Naval Operations
2185:. 22 November 1913. p. 1.
1543:. Cambridge University Press.
861:Precise Time and Time Interval
633:. Maury had the world's first
427:The observatory is located in
1:
5144:Landmarks in Washington, D.C.
3098:Naval Network Warfare Command
3083:Naval Special Warfare Command
3078:Naval Forces Southern Command
2716:Harper's New Monthly Magazine
2626:"USNO Master Clock via Modem"
2603:. Naval Oceanography Portal.
998:Number One Observatory Circle
986:Number One Observatory Circle
412:. Established in 1830 as the
146:Show map of the United States
4541:United States v. The Amistad
4471:
4202:Joint Base Anacostia–Bolling
3772:Navy Senior Enlisted Academy
3164:Office of Naval Intelligence
3134:Naval Supply Systems Command
3073:Naval Forces Central Command
2974:Expeditionary Combat Command
2456:. 2006-01-27. Archived from
1846:Astronomy Picture of the Day
1632:Portolano, M. (2013-03-25).
785:Washington metropolitan area
764:design has since become the
538:Established by order of the
480:Earth orientation parameters
116:Show map of Washington, D.C.
3757:Naval Hospital Corps School
3563:Explosive ordnance disposal
3405:Registered civilian vessels
3174:Naval Legal Service Command
2872:Under Secretary of the Navy
2482:"USNO Network Time Servers"
1719:"Naval Oceanography Portal"
1390:DC.GOV – Office of Planning
1256:Astronomy and observatories
1074:The alternate facility, at
1063:5071A-001 high performance
822:History of the time service
741:telescope, then located at
699:, which defines a standard
599:, north of the site of the
434:at the northwestern end of
5195:
4625:Birthplace and family home
3204:Navy Installations Command
2652:"The USNO Instrument Shop"
2179:"Paris time by wireless".
2006:. U.S. Naval Observatory.
1611:10.1177/002182869102200106
1290:Coordinated Universal Time
1140:Coordinated Universal Time
1076:Schriever Space Force Base
1067:atomic clocks and 24
1024:
995:
954:Department operated under
928:Schriever Space Force Base
841:In November 1913 the
762:Ritchey–Chrétien telescope
556:
484:celestial reference system
440:astronomical observatories
416:, it is one of the oldest
61:Northwest Washington, D.C.
29:
4986:
4966:National Republican Party
4321:
4207:Naval Research Laboratory
4097:
3704:Naval Postgraduate School
3209:Navy Working Capital Fund
3189:Bureau of Naval Personnel
3124:Naval Air Systems Command
3119:Naval Sea Systems Command
2938:
2877:Chief of Naval Operations
2839:
2394:United States Coast Guard
2301:Seidelmann, P.K. (1997).
1960:10.1017/S1743921305001304
1817:. National Park Service.
1747:"The Naval Observatory".
1559:– via Google Books.
1015:chief of naval operations
924:United States Space Force
922:constellation run by the
299:
295:
236:Naval District Washington
89:
80:
68:
63:in the United States
58:
53:
4409:U.S. Minister to Prussia
3777:Navy Supply Corps School
3681:Officer Candidate School
3350:Amphibious warfare ships
3194:Chief of Naval Personnel
3103:Military Sealift Command
2724:Dick, Steven J. (2003).
1877:Dick, Steven J. (2003).
1537:Dick, Steven J. (2003).
1223:The Astronomical Almanac
894:The Astronomical Almanac
668:Cambridge, Massachusetts
595:. It opened in 1844 in
446:, it was relocated from
140:NSF US Naval Observatory
110:NSF US Naval Observatory
38:Not to be confused with
4777:1965 television series)
4535:Smithsonian Institution
4510:Monroe Doctrine, author
4393:U.S. Minister to Russia
3989:Ship naming conventions
3752:Naval Chaplaincy School
3716:Marine Corps University
3712:Naval Community College
3696:Naval University System
3455:Yard and district craft
2628:. Tycho.usno.navy.mil.
2154:Bartky, Ian R. (2000).
988:, official home of the
662:Nautical Almanac Office
478:), in order to produce
4939:(paternal grandmother)
4933:(paternal grandfather)
4060:military installations
3969:Revolt of the Admirals
3924:Line-crossing ceremony
3829:Awards and decorations
1800:10.1093/mnras/54.4.240
1347:Matthew Fontaine Maury
1335:James Melville Gilliss
1278:USNO Flagstaff Station
1244:Astronomical Phenomena
1213:) (v. 1–16: 1900–1949)
1193:) (v. 1–22: 1862–1880)
1172:
1116:servers on the public
1109:
1036:
993:
793:USNO Flagstaff Station
774:Hubble Space Telescope
753:
522:
495:the official residence
377:
5179:Geodesy organizations
4925:Thomas Boylston Adams
4791:Mutiny on the Amistad
4462:Treaty of Fond du Lac
4447:Internal improvements
3650:Operations specialist
3583:Medical Service Corps
2867:Secretary of the Navy
2197:"Catalog information"
2156:Selling the True Time
1761:– via ProQuest.
1353:P. Kenneth Seidelmann
1341:Louis M. Goldsborough
1273:Old Naval Observatory
1203:) (v. 1–7: 1887–1893)
1183:) (v. 1–6: 1846–1867)
1164:
1103:
1034:
984:
956:P. Kenneth Seidelmann
906:Former USNO director
832:railroad chronometers
758:George Willis Ritchey
751:
559:Old Naval Observatory
553:Old Naval Observatory
547:Louis M. Goldsborough
512:
363:
216:Department of Defense
177:38.92139°N 77.06694°W
33:USNO (disambiguation)
4872:John Quincy Adams II
4783:The Adams Chronicles
4186:Washington Navy Yard
3984:Ship decommissioning
3959:Navy service numbers
3782:Nuclear Power School
3762:Naval Justice School
3593:Civil Engineer Corps
3390:Mine warfare vessels
3088:Naval Reserve Forces
3044:Fleet Forces Command
3011:Carrier strike group
1448:"The USNO's Mission"
1359:Gernot M. R. Winkler
1301:railroad chronometer
1230:The Nautical Almanac
1045:Colorado Springs, CO
908:Gernot M. R. Winkler
900:The Nautical Almanac
772:and the space-borne
612:Massachusetts Avenue
462:-based positions of
333:Garrison information
197:Military observatory
4951:(great-grandfather)
4913:Abigail Adams Smith
4770:Profiles in Courage
4723:U.S. Postage stamps
4610:Abigail Adams Cairn
4351:U.S. Representative
4339:U.S. Representative
4327:U.S. Representative
3184:Naval Safety Center
3144:Fleet Cyber Command
2544:. 5 December 2012.
2486:tycho.usno.navy.mil
2319:1997AAS...191.0105S
2255:"USNO Master Clock"
1951:2005tvnv.conf..100D
1791:1894MNRAS..54..261.
1603:1991JHA....22...31D
990:U.S. vice president
885:calculation methods
854:Arlington, Virginia
718:photographic plates
577:marine chronometers
482:and to realize the
182:38.92139; -77.06694
173: /
4733:Mount Quincy Adams
4674:Presidential runs
3979:Ship commissioning
3445:Torpedo retrievers
3006:Aircraft squadrons
2969:Fleet Marine Force
2833:United States Navy
2787:2018-04-26 at the
2757:(British edition).
2454:United States Navy
2182:The New York Times
2129:Lowell Observatory
2012:United States Navy
1173:
1170:Flagstaff, Arizona
1110:
1037:
994:
967:Flagstaff, Arizona
879:, and fundamental
789:Flagstaff, Arizona
754:
573:United States Navy
523:
406:United States Navy
378:
232:Controlled by
5022:
5021:
4848:Charles Adams Sr.
4785:(1976 miniseries)
4652:Electoral history
4520:Adams–Onís Treaty
4315:John Quincy Adams
4281:
4280:
4277:
4276:
4246:
4245:
4215:
4214:
4170:Naval Observatory
4133:
4132:
4095:
4094:
4025:
4024:
3810:
3809:
3700:Naval War College
3625:Hospital corpsman
3620:Boatswain's mates
3534:
3533:
3463:
3462:
3425:Ships of the line
3375:Destroyer escorts
3340:Aircraft carriers
3179:Naval Observatory
3021:Naval Observatory
2684:. Usno.navy.mil.
2601:www.usno.navy.mil
2424:(Press release).
2352:National Archives
2165:978-0-8047-3874-3
1977:. Baltimore, MD:
1888:978-0-521-81599-4
1750:The Baltimore Sun
1723:www.usno.navy.mil
1513:www.usno.navy.mil
1262:dark-sky movement
1209:, Second Series (
952:Orbital Mechanics
944:Orbital Mechanics
865:Earth orientation
843:Paris Observatory
691:Astronomical Unit
527:John Quincy Adams
358:
357:
18:Naval observatory
16:(Redirected from
5186:
5111:
5110:
5099:
5098:
5087:
5086:
5085:
5075:
5074:
5073:
5063:
5062:
5061:
5051:
5050:
5039:
5038:
5037:
5030:
5011:
5010:
4999:Andrew Jackson →
4945:(paternal uncle)
4937:Susanna Boylston
4814:2008 miniseries)
4467:Treaty of Limits
4420:
4412:
4404:
4396:
4388:
4380:
4369:
4358:
4346:
4334:
4308:
4301:
4294:
4285:
4257:
4226:
4144:
4115:
4103:
4077:
4064:Washington, D.C.
4052:
4045:
4038:
4029:
3939:Ceremonial Guard
3899:Continental Navy
3854:Current aircraft
3660:Hispanic sailors
3485:
3476:
3410:Sailing frigates
3032:
2944:
2943:
2896:3-star admirals
2848:
2847:
2831:
2829:
2828:
2818:
2811:
2804:
2795:
2773:
2772:
2770:Official website
2747:
2720:
2697:
2696:
2694:
2693:
2677:
2671:
2670:
2668:
2667:
2656:ad.usno.navy.mil
2647:
2641:
2640:
2638:
2637:
2622:
2616:
2615:
2613:
2612:
2597:"Telephone Time"
2593:
2587:
2586:
2584:
2583:
2564:
2558:
2557:
2555:
2553:
2532:
2526:
2525:
2523:
2522:
2511:"Telephone Time"
2507:
2501:
2500:
2498:
2497:
2488:. Archived from
2478:
2472:
2471:
2469:
2468:
2462:
2451:
2443:
2437:
2436:
2434:
2433:
2418:
2412:
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2409:
2408:
2402:
2391:
2382:
2367:
2366:
2364:
2363:
2340:
2334:
2333:
2331:
2330:
2298:
2292:
2291:
2286:. Archived from
2280:
2274:
2273:
2271:
2270:
2251:
2245:
2244:
2242:
2241:
2222:
2216:
2215:
2213:
2212:
2193:
2187:
2186:
2176:
2170:
2169:
2151:
2145:
2144:
2142:
2141:
2120:
2114:
2113:
2111:
2110:
2091:
2085:
2084:
2082:
2081:
2062:
2056:
2055:
2053:
2052:
2033:
2027:
2026:
2024:
2023:
2014:. Archived from
2000:
1994:
1993:
1991:
1990:
1971:
1965:
1964:
1962:
1928:
1922:
1921:
1919:
1918:
1899:
1893:
1892:
1874:
1861:
1860:
1858:
1857:
1836:
1830:
1829:
1827:
1826:
1811:
1805:
1804:
1802:
1785:(4): 261. 1894.
1769:
1763:
1762:
1744:
1738:
1737:
1735:
1734:
1715:
1709:
1708:
1706:
1705:
1687:
1681:
1680:
1678:
1677:
1629:
1623:
1622:
1586:
1580:
1579:
1567:
1561:
1560:
1558:
1557:
1534:
1528:
1527:
1525:
1524:
1505:
1499:
1498:
1496:
1495:
1476:
1467:
1466:
1464:
1463:
1444:
1438:
1437:
1435:
1434:
1415:
1409:
1408:
1406:
1404:
1398:
1387:
1379:
1329:Samuel P. Carter
1092:
948:Nautical Almanac
712:
711:
705:transit of Venus
698:
697:
672:Washington, D.C.
642:Charles Goodyear
603:and west of the
601:Lincoln Memorial
432:Washington, D.C.
420:agencies in the
319:
317:
274:
269:
266:
264:
262:
260:
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256:
207:Site information
188:
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117:
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36:
21:
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5119:
5118:
5117:
5105:
5093:
5083:
5081:
5071:
5069:
5059:
5057:
5045:
5035:
5033:
5025:
5023:
5018:
4982:
4954:
4842:George W. Adams
4826:
4818:
4761:
4755:
4740:President Adams
4696:
4683:Corrupt Bargain
4646:
4597:
4591:
4563:
4515:Treaty of Ghent
4502:
4496:
4442:American System
4423:
4415:
4407:
4399:
4391:
4383:
4372:
4361:
4349:
4337:
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4317:
4312:
4282:
4273:
4242:
4211:
4190:
4174:
4158:
4129:
4104:
4091:
4066:
4056:
4026:
4021:
3929:National Museum
3874:
3868:
3806:
3664:
3530:
3504:
3471:
3469:
3459:
3380:Escort carriers
3259:
3213:
3107:
3036:
3030:
3026:Master jet base
2979:Merchant Marine
2945:
2941:
2936:
2922:2-star admirals
2892:4-star admirals
2855:
2835:
2826:
2824:
2822:
2789:Wayback Machine
2768:
2767:
2764:
2736:
2723:
2708:
2705:
2703:Further reading
2700:
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2689:
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2019:
2002:
2001:
1997:
1988:
1986:
1973:
1972:
1968:
1930:
1929:
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1916:
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1900:
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1889:
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1412:
1402:
1400:
1396:
1385:
1381:
1380:
1376:
1372:
1367:
1253:
1237:The Air Almanac
1159:
1151:
1149:Instrument shop
1090:
1087:atomic fountain
1069:hydrogen masers
1029:
1023:
1000:
979:
940:
910:initiated the "
824:
781:light pollution
770:Keck telescopes
731:
709:
708:
695:
694:
687:
664:
649:mean solar noon
627:
561:
555:
517:discovered the
507:
444:light pollution
370:Marcus Manilius
339:
315:
313:
283:
253:
181:
179:
175:
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120:
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107:
76:
59:
44:
37:
30:
28:
23:
22:
15:
12:
11:
5:
5192:
5190:
5182:
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5176:
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5166:
5161:
5156:
5151:
5146:
5141:
5136:
5131:
5121:
5120:
5116:
5115:
5103:
5091:
5079:
5067:
5055:
5043:
5020:
5019:
5017:
5016:
5003:
5002:
4995:
4992:← James Monroe
4987:
4984:
4983:
4981:
4980:
4977:Quincy Patriot
4973:
4968:
4962:
4960:
4956:
4955:
4953:
4952:
4946:
4940:
4934:
4931:John Adams Sr.
4928:
4922:
4916:
4910:
4909:
4908:
4903:
4898:
4890:
4889:
4888:
4883:
4875:
4869:
4863:
4857:
4851:
4845:
4839:
4832:
4830:
4820:
4819:
4817:
4816:
4811:
4803:
4795:
4787:
4779:
4774:
4765:
4763:
4757:
4756:
4754:
4753:
4744:
4735:
4730:
4725:
4720:
4715:
4713:Adams Memorial
4710:
4704:
4702:
4698:
4697:
4695:
4694:
4693:
4692:
4687:
4686:
4685:
4672:
4671:
4670:
4665:
4656:
4654:
4648:
4647:
4645:
4644:
4639:
4638:
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4632:
4627:
4617:
4612:
4607:
4601:
4599:
4593:
4592:
4590:
4589:
4588:
4587:
4577:
4575:Lifelong diary
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3849:Reserve fleet
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3839:Current fleet
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3630:Naval Aviator
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3568:Medical Corps
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3440:Torpedo boats
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3430:Sloops of war
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3250:Seventh Fleet
3248:
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3149:Naval Academy
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3056:Pacific Fleet
3054:
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3047:
3046:
3045:
3042:
3041:
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3033:
3027:
3024:
3022:
3019:
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3016:Installations
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2735:0-521-81599-1
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2653:
2650:Fey, Alan L.
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2541:Washingtonian
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2492:on 2006-01-16
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2463:on 2011-06-15
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2265:on 2010-12-07
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4012:Wetting-down
4001:Constitution
4000:
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3873:History and
3844:Future fleet
3588:Supply Corps
3573:Dental Corps
3556:Deputy Chief
3235:Fourth Fleet
3225:Second Fleet
3178:
3020:
2996:Future ships
2991:Active ships
2964:Navy Reserve
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1106:master clock
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1021:Time service
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304:Site history
5154:Embassy Row
5077:Outer space
5065:Spaceflight
4949:John Quincy
4943:Elihu Adams
4860:Henry Adams
4793:(1987 book)
4772:(1957 book)
4547:Mendi Bible
4419:(1794–1797)
4411:(1797–1801)
4403:(1803–1808)
4395:(1809–1814)
4387:(1814–1817)
4379:(1817–1825)
4368:(1825–1829)
4357:(1831–1833)
4345:(1833–1843)
4333:(1843–1848)
4252:Coast Guard
4163:Observatory
3909:Fleet bands
3894:Blue Angels
3578:Nurse Corps
3500:Designators
3360:Battleships
3355:Auxiliaries
3255:Tenth Fleet
3245:Sixth Fleet
3240:Fifth Fleet
3230:Third Fleet
1945:: 100–110.
1351:astronomer
1339:Lieutenant
1333:Lieutenant
1311:Time signal
1061:Symmetricom
938:Departments
838:receivers.
779:Because of
605:White House
591:across the
543:John Branch
436:Embassy Row
402:timekeeping
366:Astronomica
325:In use
245:Operational
180: /
156:Coordinates
5174:Astrometry
5159:Time balls
5123:Categories
4901:First Lady
4886:presidency
4878:John Adams
4874:(grandson)
4868:(grandson)
4862:(grandson)
4809:(2001 book
4807:John Adams
4749:John Adams
4630:Peacefield
4605:Early life
4429:Presidency
4147:Facilities
3964:Navy Weeks
3914:Fleet Week
3875:traditions
3435:Submarines
3370:Destroyers
2860:Leadership
2692:2011-07-27
2666:2018-11-08
2636:2011-07-27
2611:2021-01-17
2582:2015-03-11
2521:2023-07-01
2496:2011-07-27
2467:2010-11-17
2432:2014-04-10
2407:2010-10-31
2392:(Report).
2362:2013-02-27
2329:2011-07-27
2269:2011-07-27
2240:2011-07-27
2211:2011-07-27
2140:2009-10-08
2109:2011-07-27
2080:2011-07-27
2051:2011-07-27
2022:2013-10-18
1989:2013-10-18
1917:2011-07-27
1856:2015-12-27
1825:2017-01-26
1733:2021-01-17
1704:2017-09-17
1676:2018-05-18
1556:2013-08-04
1523:2022-03-28
1494:2022-03-28
1462:2011-07-27
1433:2011-07-27
1370:References
1345:Commander
1025:See also:
877:astrometry
873:navigation
869:astrometry
797:Kaj Strand
635:vulcanized
631:M.F. Maury
581:calibrated
525:President
515:Asaph Hall
468:astrometry
418:scientific
398:navigation
346:Mark Burns
165:38°55′17″N
5101:Education
5041:Astronomy
4927:(brother)
4921:(brother)
4221:Air Force
3949:Navy Hymn
3944:Navy Flag
3934:Navy Band
3816:Equipment
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3539:Personnel
3468:Personnel
3061:Commander
3049:Commander
3035:Operating
2951:Structure
2910:2010–2019
2905:2000–2009
2900:1864–1959
2744:689985797
2313:: 01.05.
2066:"History"
1759:533000734
1619:117369344
1597:: 45–53.
1357:director
1306:time ball
881:astronomy
812:Flagstaff
739:refractor
693:, or the
653:telegraph
638:time ball
429:Northwest
340:commander
242:Condition
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4596:Life and
4568:Writings
4118:Barracks
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3737:COMPTUEX
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3509:Enlisted
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3488:Officers
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2686:Archived
2660:Archived
2630:Archived
2605:Archived
2576:Archived
2546:Archived
2515:Archived
2426:Archived
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2356:Archived
2323:Archived
2234:Archived
2134:Archived
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1819:Archived
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1727:Archived
1698:Archived
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1517:Archived
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593:meridian
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351:Garrison
222:Operator
168:77°4′1″W
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4959:Related
4799:Amistad
4762:culture
4760:Popular
4659:Senate
4261:Station
4238:Bolling
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3640:Seabees
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2315:Bibcode
1947:Bibcode
1787:Bibcode
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1423:pnt.gov
1057:Agilent
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810:, near
783:in the
585:transit
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497:of the
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464:quasars
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314: (
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4897:mother
4882:father
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4752:(1963)
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4503:events
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2986:Units
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2390:(PDF)
1662:S2CID
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1365:Notes
1292:(UTC)
1211:PUSNO
1201:USNOO
1191:USNOM
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1043:near
589:stars
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