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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
  ecdowney@noao.edu
  August 1995

--
erich@FreeBSD.org

WWW: http://www.clearskyinstitute.com/xephem/xephem.html