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  2. United States Naval Observatory - Wikipedia

    en.wikipedia.org/.../United_States_Naval_Observatory

    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]

  3. United States Naval Observatory Flagstaff Station - Wikipedia

    en.wikipedia.org/wiki/United_States_Naval...

    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]

  4. Washington Mean Time - Wikipedia

    en.wikipedia.org/wiki/Washington_mean_time

    A later version of Washington mean time based on the meridian of the clock room at the exact center of the New Naval Observatory (77°4′2.24″W or GMT − 5 h 8 m 16.15 s) was still being used in 1950 on a few pages of the American Ephemeris and Nautical Almanac, even though most of its pages used Greenwich Civil Time, the American name for ...

  5. Time synchronization in North America - Wikipedia

    en.wikipedia.org/wiki/Time_synchronization_in...

    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).

  6. Nautical almanac - Wikipedia

    en.wikipedia.org/wiki/Nautical_almanac

    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".

  7. Asaph Hall - Wikipedia

    en.wikipedia.org/wiki/Asaph_Hall

    Asaph Hall discovered Deimos on August 12, 1877 at about 07:48 UTC and Phobos on August 18, 1877, at the US Naval Observatory in Washington, D.C., at about 09:14 GMT (contemporary sources, using the pre-1925 astronomical convention that began the day at noon, give the time of discovery as 11 August 14:40 and 17 August 16:06 Washington mean time ...

  8. WWV (radio station) - Wikipedia

    en.wikipedia.org/wiki/WWV_(radio_station)

    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.

  9. Civil time - Wikipedia

    en.wikipedia.org/wiki/Civil_time

    HM Nautical Almanac Office in the United Kingdom used Greenwich Mean Time (GMT) for both conventions, leading to ambiguity [clarification needed], whereas the Nautical Almanac Office at the United States Naval Observatory used GMT for the pre-1925 convention and Greenwich Civil Time (GCT) for the post-1924 convention until 1952.