You are here: Home USNO Earth Orientation EO Information Center General Information Bulletin D
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.
 

Bulletin D

IERS Bulletin D announces UT1-UTC values.

  • values of DUT1 = (UT1-UTC) transmitted with time signals are published in IERS Bulletin D to a precision of 0.1 s
  • previous issues of Bulletin D are archived here
USNO Master Clock Time
Javascript must be Enabled