What Does USNO Stand For?

USNO stands for U S Naval Observatory

The U.S. Naval Observatory (USNO) is a scientific institution under the Department of the Navy, responsible for timekeeping, astronomical research, and the maintenance of celestial reference frames. Established in 1830, it plays a critical role in providing precise astronomical data and services that support navigation, positional astronomy, and global time standards. Additionally, the USNO contributes to the development of new technologies in astrometry and planetary science, fostering advancements in both military and civilian applications.