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The USNO websites aa.usno.navy.mil, ad.usno.navy.mil, aristarchus.usno.navy.mil, maia.usno.navy.mil, rorf.usno.navy.mil, and toshi.usno.navy.mil are undergoing modernization efforts. The expected completion of the work and return of service is estimated as 30 April 2020. Please submit a requirements form to the USNOPAO if the information you are seeking is not accessible via other means.
 

Data Services

Sunset

This US Naval Observatory Website is undergoing modernization and will be offline starting Thursday, 24 October 2019. The expected completion of work and return of service is estimated as 30 April 2020. Please visit https://www.usno.navy.mil/USNO/about-us and submit a Requirements Form to the USNO PAO if the information you are seeking is not accessible via another means.



Rise/Set/Transit/Twilight Data

Phases of the Moon

Eclipses and Transits

Positions of Selected Celestial Objects

Synthetic Views of the Earth and Solar System Bodies

Dates

Celestial Navigation

USNO Master Clock Time
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