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 the estimated return of service is Summer 2020.
 

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USNO Master Clock Time
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