You are here: Home USNO Astrometry VLBI-based Products Reference Frames Terrestrial Frame
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 return of service is estimated as 30 April 2020. Please submit a requirements form to the USNOPAO if the information you are seeking is not accessible via other means.
 

Terrestrial Reference Frame

north_american_plate_deformation

Terrestrial Reference Frame (TRF)

The Terrestrial Reference Frame product consists of a set of station positions and velocities.

 

VLBI solutions from which the above products are derived including explanations, comparisons and format information.

Terrestrial Reference Frame
Global VLBI TRF/EOP Solution 2008b

 

USNO Master Clock Time
Javascript must be Enabled