The USNO's Mission
1. Determine the positions and motions of celestial bodies, motions of the Earth, and precise time.
2. Provide astronomical and timing data required by the Navy and other components of the Department of Defense for navigation, precise positioning, and command, control, and communications.
3. Make these data available to other government agencies and to the general public.
4. Conduct relevant research, and perform such other functions as may be directed by higher authority.