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United States Naval Observatory is a unique observatory run by the Navy. It does some of the grunt work of astronomy -- keeping accurate time, determining positions of stars (astrometry), etc. They are responsible for publishing the Astronomical Almanac.
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astronomical observatories, observatory, astrometry, atomic clocks, earth orientation, full-sky astrometric mapping explorer, global positioning system, npoi, navy prototype optical interferometer, precise time, radio optical reference frame, radio reference frame image database, two-way satellite time transfer, united states naval observatory, vlbi, very long baseline interferometry, u.s.