You are here: Home USNO Astrometry VLBI-based Products Product Information VLBI Analysis Center Reports
The USNO websites,,,,, and 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.

VLBI Analysis Center Reports

Personnel at the USNO supply products and information to the International VLBI Service for Astrometry and Geodesy (IVS) for distribution to the world-wide astrometric/geodetic community.   Personnel comprise two IVS Analysis Centers one for analysis of VLBI data and the second for investigation of extragalactic source structure.  Yearly reports from the two analysis centers are published in the IVS Annual Reports.

USNO Master Clock Time
Javascript must be Enabled