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.
 

Molyneux Clock

This astronomical clock was made by Robert Molyneux and Sons and purchased by the Naval Observatory for Lt. James M. Gilliss' observing expedition to Santiago, Chile in 1850-1852.
USNO Master Clock Time
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