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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]
The United States Naval Observatory Flagstaff Station (NOFS), is an astronomical observatory near Flagstaff, Arizona, US. It is the national dark-sky observing facility under the United States Naval Observatory (USNO). [1] NOFS and USNO combine as the Celestial Reference Frame [2] manager for the U.S. Secretary of Defense. [3] [4]
Almanac data is now available online from the US Naval Observatory. [3] [4] Also commercial almanacs were produced that combined other information. A good example would be Brown's, which commenced in 1877, and is still produced annually, its early 20th-century subtitle being "Harbour and Dock Guide and Advertiser and Daily Tide Tables".
In the United States, the United States Naval Observatory provides the standard of time, called UTC(USNO), for the United States military and the Global Positioning System, [1] while the National Institute of Standards and Technology provides the standard of time for civil purposes in the United States, called UTC(NIST).
The Queen Anne style house in 1895; built of terracotta brick, it was unpainted until 1960. The house at One Observatory Circle was designed by architect Leon E. Dessez and built in 1893 for $20,000 (equivalent to $678,222 in 2023) for the use of the superintendent of the Naval Observatory who was the original resident.
The Department of Defense master clock is the atomic master clock to which time and frequency measurements for the United States Department of Defense are referenced. Located in Washington D.C., the U.S. Naval Observatory master clock is designated as the "DOD Master Clock".
The Navy Precision Optical Interferometer (NPOI) is an American astronomical interferometer, with the world's largest baselines, operated by the Naval Observatory Flagstaff Station (NOFS) in collaboration with the Naval Research Laboratory (NRL) and Lowell Observatory. The NPOI primarily produces space imagery and astrometry, the latter a major ...
Since 1945, WWV has disseminated "official U.S. time" provided by government entities NIST and the United States Naval Observatory (USNO), to ensure that uniform time is maintained throughout the United States and around the world. WWV provides a public service by making time information freely available at all hours.