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The U.S. Naval Observatory in Washington continues to be a major authority in the areas of [[Precise Time and Time Interval]], [[Earth Orientation Parameters|Earth orientation]], [[astrometry]], and celestial observation. In collaboration with many national and international scientific establishments, it determines the timing and astronomical data required for accurate [[navigation]], [[astrometry]], and fundamental [[astronomy]], and [[Naval Observatory Vector Astrometry Subroutines|calculation methods]] — and distributes this information (such as [[Star catalogue|star catalogs]])<ref>{{cite web |publisher=Naval Meteorology and Oceanography Command |title=Catalog information |series=Naval Oceanography Portal |website=usno.navy.mil |url=http://www.usno.navy.mil/USNO/astrometry/information/catalog-info |access-date=2011-07-27}}</ref> on-line and in the annual publications ''[[The Astronomical Almanac]]'' and ''[[The Nautical Almanac]]''.<ref>{{cite web |publisher=Naval Meteorology and Oceanography Command |title=Interactive catalog and image search |series=Naval Oceanography Portal |website=usno.navy.mil |url=http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/icas/fchpix |access-date=2011-07-27}}</ref>
Former USNO director [[Gernot M. R. Winkler]] initiated the "[[Master clock]]" service that the USNO still operates,<ref>{{cite web |title=USNO Master Clock |url=http://www.usno.navy.mil/USNO/time/master-clock/ |access-date=2011-07-27 |website=usno.navy.mil |series=Naval Oceanography Portal }}</ref><ref>{{cite web | url=http://www.usno.navy.mil/USNO/time/master-clock/ | archive-url=
==Departments==
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