You are here: Home USNO About Us Frequently Asked Questions
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.
 

Frequently Asked Questions

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 as 30 April 2020.  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.

 
  • Does the Naval Observatory offer tours of its facilities?  Unfortunately due to new DoD security requirements we no longer offer public tours of the facility. 

 

USNO Master Clock Time
Javascript must be Enabled