You are here: Home USNO Astrometry Optical/IR Products USNO-B1.0 Precision Measuring Machine

Precision Measuring Machine

The measuring engine located at the US Naval Observatory Flagstaff Station which was used to digitize and measure star positions on numerous photographic plates from major sky surveys. These positions formed the basis of the USNO-B1.0 star catalog.
USNO Master Clock Time
Javascript must be Enabled