United States Naval Observatory

Scientific agency and observatory in Washington, D.C., United States
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inception
1842
alias
U.S. Naval Observatory
US Naval Observatory
USNO
coordinate location
latitude38.921
longitude-77.067
precision0
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Commons category
United States Naval Observatory
Wikipedia creation date
3/10/2002
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Wikipedia opening text
The United States Naval Observatory (USNO) is one of the oldest scientific agencies in the United States, with a primary mission to produce Positioning, Navigation and Timing (PNT) for the United States Navy and the United States Department of Defense. Located in Northwest Washington, D.C. at the Northwestern end of Embassy Row, it is one of the pre-1900 astronomical observatories located in an urban area; at the time of its construction, it was far from the light pollution thrown off by the (then-smaller) city center. Former USNO director Gernot M. R. Winkler initiated the "Master Clock" service that the USNO still operates, and which provides precise time to the GPS satellite constellation run by the United States Air Force. The USNO performs radio VLBI-based positions of quasars with numerous global collaborators, in order to produce Earth Orientation parameters. Aside from its scientific mission, a house located within the Naval Observatory complex serves as the official residence of the Vice President of the United States.
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USNO
U.S. Naval Observatory
US Naval Observatory
U.s. naval observatory
Naval Observatory, District of Columbia
U.S. Naval Observatory, Washington
U.S. Nautical Almanac Office
Naval observatory
Naval Observatory
Depot of Charts and Instruments (U.S. Navy)
The USNO Time Scale
Observatory Hill (Washington, D.C.)
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