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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, toshi.usno.navy.mil, and tycho.usno.navy.mil 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

NOTICE

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 spring, 2021, subject to change due to potential impacts of COVID-19.  Please visit usno.navy.mil 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 – Paul D. Shankland, Ph.D., 1961 - 2020

 

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


News! from the Naval Observatory

 

Tour Information

Due to enhanced DoD Security requirements, public tours of the U.S. Naval Observatory are no longer conducted.

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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