The United States Naval Observatory (USNO) is one of the oldest scientific agencies in the United States, with a primary mission to produce Positioning, Navigation, and Timing (PNT) for the U.S. Navy and the U.S. Department of Defense.
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United States Naval Observatory
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scientific agency and observatory in Washington, D.C., United States
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by Rand McNally , United States Naval Observatory , United States Nautical Almanac Office , 8054001408 , 8050001416 , 0854001530 , 008-054-00176-9 , United States Naval Observatory Nautical... , Rutherford Appleton Laboratory, Engl Her... , and 5 others
First published in 1983
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54 editions
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