May 26, 2018

Interactive astronomical ephemeris program

Xephem is an interactive astronomical ephemeris program for X Windows systems. It …

computes heliocentric, geocentric and topocentric information for fixed
celestial objects and objects in heliocentric and geocentric orbits;

has built-in support for all planet positions; the moons of Jupiter, Saturn
and Earth; Mars' and Jupiter's central meridian longitude; Saturn's rings;
and Jupiter's Great Red Spot

Elwood Downey August 1995

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