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The USNO websites,,,,,, and are undergoing modernization efforts. The expected completion of the work and the estimated return of service is Fall 2020, subject to change due to potential impacts of COVID-19.

News, Tours, & Events


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 to be fall 2020, subject to change due to potential impacts of COVID-19.  Please visit and submit a Requirements Form to the USNO PAO if the information you are seeking is not accessible via another means.


Information on tours of the U.S. Naval Observatory, the latest News from the Naval Observatory, scientific colloquia, and other events at USNO.

In Memoriam – Victor J. Slabinski, Ph.D., 1940 - 2020

News! from the Naval Observatory


Tour Information

Public tours of the U.S. Naval Observatory have been suspended until further notice.

Scientific Colloquia

Scientific colloquia at USNO are mainly for the staff, but scientists from other institutions are welcome to attend.  Admission procedures and the schedule of upcoming talks can be found here.

USNO Master Clock Time
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