About Naval Observatory, DC
The United States Naval Observatory (USNO) is known as one of the oldest scientific agencies in the United States. The USNO is located in Northwest Washington D.C. at Embassy Row. There are four departments within the observatory; Astronomical Applications - established in 1990, Astrometry, Earth Orientation, and Time Service.
Created on December of 1830, the Observatory produces Positioning, Navigation, and Timing (PNT) for the U.S. Navy and the Department of Defense. Although it was first known as the Depot of Charts and Instruments, the agency's name was changed to the U.S. Naval Observatory in 1844.
Currently, the Naval Observatory employs several hundred individuals and continues to perform essential duties that are vital to the United States and other government agencies. The USNO's mission includes determining and maintaining the U.S. Master Clock, and defining the positions and directions of the planets, stars, and other astral objects.