The Nautical Almanac Office of the United States Naval Observatory computes and prepares the critical American navigational publications, the Air Almanac and the Nautical Almanac.
In addition, they carry on the essential research work of deriving improved values of the fundamental astronomical elements and embodying them in new tables of the celestial motions, publishing the annual Astronomical Phenomena and the Astronomical Almanac, the latter in cooperation with Her Majesty's Nautical Almanac Office, United Kingdom Hydrographic Office.
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