urn:nasa:pds:context:facility:observatory.nofs 1.1 1.22.0.0 Product_Context 2025-01-07 1.1 Updated schema version. Adding missing "telescope" references. 2016-04-04 1.0 Initial urn:nasa:pds:context:telescope:nofs.usno1m55 facility_to_telescope urn:nasa:pds:context:instrument:no-host.poets facility_to_instrument US Naval Observatory Observatory

10391 West Naval Observatory Road Flagstaff, Arizona 86001-8521.

USA The US Naval Observatory, located in Washington, D.C., is one of the oldest scientific agencies in the United States. It is renowned for its work in astrometry, precise timekeeping, and celestial navigation. The observatory plays a key role in maintaining the country's Master Clock and providing astronomical data critical for navigation and defense.