United States Naval Observatory Flagstaff Station

The United States Naval Observatory Flagstaff Station (NOFS), is an astronomical observatory near Flagstaff, Arizona, USA. It is the national dark-sky observing facility for the U.S. Department of Defense, under the United States Naval Observatory (USNO). NOFS and USNO combine as the Celestial Reference Frame manager for the U.S. Secretary of Defense.

Read more about United States Naval Observatory Flagstaff Station:  General Information, Site Description, Instruments, Navy Precision Optical Interferometer, Gallery

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