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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, and toshi.usno.navy.mil are undergoing modernization efforts.  The expected completion of the work and the estimated return of service is Summer 2020.
 

Software

Supporting software, database for searching through Earth orientation results and for calculating the rotation matrices between terrestrial and celestial reference frames.

Search databases

Auxiliary Software

Supporting Software  Find routines for which Earth Orientation can be used as input.

USNO Master Clock Time
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