United States Naval Observatory, Astronomical observatory in Washington, D.C.
The United States Naval Observatory is one of the oldest scientific agencies in the United States, with a primary mission to produce Positioning, Navigation and Timing for the U.S. Navy and the U.S. Department of Defense.
Established in 1830, the observatory has played a key role in the history of American astronomy.
The Vice President's residence is located on the grounds of the observatory.
It provides astronomical data and celestial navigation for the U.S. Navy.
It houses the 'Master Clock', which provides precise time to the GPS satellite constellation.
Location: Washington, D.C.
Inception: 1842
Official opening: 1893
Accessibility: Wheelchair accessible
Address: 3450 Massachusetts Ave NW, Washington, DC 20392 20392
Website: cnmoc.usff.navy.mil/usno
Sources: Wikimedia, OpenStreetMap
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