Website: www.usno.navy.mil/USNO

3450 Massachusetts Ave., NW
Washington, DC 20392

About Us:
The U.S. Naval Observatory performs an essential role for the Navy, the Department of Defense (DoD), and the nation. Its mission is to:

- Determine the positions and motions of celestial bodies, motions of the Earth, and precise time.

- Provide astronomical and timing data required by the Navy and other components of the DoD for navigation, precise positioning, and command, control, and communications.

- Make these data available to other government agencies and to the general public.

- Conduct relevant research, and perform such other functions as may be directed by higher authority.