The United States Naval Observatory (USNO) is a renowned institution that provides a wide range of astronomical data and products. Established in 1830 as the U.S. Navy Depot of Charts and Instruments, USNO is recognized as the world's leading authority on spatial and temporal reference frames. It serves as the official source of time for the U.S. Department of Defense and sets the standard of time for the entire country.
Headquartered in Washington, D.C., USNO operates a dark-sky observing station near Flagstaff, Arizona, known as the Naval Observatory Flagstaff Station (NOFS). Additionally, it has a detachment facility called the Alternate Master Clock (AMC) located at Schriever Space Force Base in Colorado Springs, Colorado. With a rich history and expertise in astronomical research, USNO continues to play a vital role in advancing our understanding of the universe.
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