Star/Sun/Satellite position indication with photodetection:
(under subclass 138) Subject matter including means responsive to light received directly from a star or stars, the sun, or other astronomical objects (including manmade satellites) in order to determine and indicate at least relative angular position with respect to an optical axis of a measuring instrument.
SEE OR SEARCH CLASS
250, Radiant Energy,
206.1+, for alternative outputs of measured coordinates that are not displayed, per se, and do not include tracking of the optics; subclasses 203.1+ for tracking of the pre-photodetector system.
