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United States Naval Observatory
English Wikipedia - The Free Encyclopedia
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United States Naval Observatory
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. The USNO operates the "
Master Clock
", 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
.
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