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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.
 

Web-Based Time Synchronization

Web time displays from the USNO Master Clock, Washington, DC

USNO servers provide a wide variety of web-based time synchronization products including embedded web clocks to display UTC(USNO) on other web pages.

 

USNO Master Clock Time
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