United States Naval Observatory

The United States Naval Observatory (USNO) is a scientific and military facility that produces geopositioning, navigation and timekeeping data for the United States Navy and the United States Department of Defense.^[2] Established in 1830 as the Depot of Charts and Instruments, it is one of the oldest scientific agencies in the United States,^[3] and remains the country's leading authority for astronomical and timing data for all purposes.^[4]