You are here: Home USNO Astronomical Applications images_AA Transit of Venus photographic plate
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.
 

Transit of Venus photographic plate

Transit of Venus photographic plate (1882) image courtesy of the U.S. Naval Observatory Library.
USNO Master Clock Time
Javascript must be Enabled