STI-900D is a series of programs that contain all programs necessary to compute and display the past, present or future position of any satellite from any position on earth. TRAK-POSN - Compute the LAT LONG TIME position of any satellite over a period of time LOOK - Compute Look Angles AZ/EL RA/DEC and TIME from any position LAT/LONG on earth OBS - Enter TIME LAT/LONG RA/DEC for your Observations of a satellite pass you saw to update predictions UPDATE - Add or Delete 2Card Element Sets to your personal Satellite Catalogue