You are here: Home USNO News, Tours & Events Tour Information
The USNO websites,,,,, and 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.

Tour Information for USNO Washington DC

Updated 2017 October 16

Public tours of the U.S. Naval Observatory in Washington, DC, have been suspended until further notice.


Due to issues beyond our control all public tours have been suspended until further notice.  Please refer to this page to check to see when/if the tours are resumed.  We apologize for this circumstance.

USNO Master Clock Time
Javascript must be Enabled