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Ephemeris
Ephemeris is a library that reads and writes NASA's Jet Propulsion Laboratory planetary ephemeris files, and calculates position...
astronomy library Jet Propulsion velocity calculator velocity positions
The Photographer's Ephemeris
An application designed for landscape photographers...
Adobe AIR landscape photographers landscape photography landscape photography
XEphem
A free interactive astronomy program for UNIX systems with X & Motif....
interactive astronomy astronomy program astronomical ephemeris XEphem