The U.S. Naval Observatory performs an essential scientific role
for the United States, the Navy, and the Department of Defense.
Its mission includes determining the positions and motions of the
Earth, Sun, Moon, planets, stars and other celestial objects,
providing astronomical data; determining precise time; measuring
the Earth's rotation; and maintaining the Master Clock for the
United States. Observatory astronomers formulate the theories and
conduct the relevant research necessary to improve these mission
goals. This astronomical and timing data, essential for accurate
navigation and the support of communications on Earth and in Space,
is vital to the Navy and Department of Defense. It is also used
extensively by other agencies of the government and the public at
large.
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