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U.S. Naval Observatory (USNO)

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  • Astrographic Catalogue
    Reference catalogue giving measurements and positions of stars brighter than 11th magnitude. Produced by the U.S. Naval Observatory and Copenhagen University Observatory.
    ad.usno.navy.mil/proj/AC
  • Data Services
    Information on sunrise, sunset, moonrise, moon illumination, positions of the sun and moon, celestial navigation, and more.
    aa.usno.navy.mil/data
  • Phases of the Moon
    Look up moon phase information for any year from 1700-2035. From the U.S. Naval Observatory's Astronomical Applications Department.
    www.usno.navy.mil/USNO/astronomical-applications/data-services/phases-moon
  • Time Service Department
    Provides the official time for the Navy, for the Department of Defense, and for the United States.
    tycho.usno.navy.mil
  • U.S. Naval Observatory (USNO)
    The U.S. Naval Observatory is the preeminent authority in the areas of precise time and astronomy.
    www.usno.navy.mil
 


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