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From the README:
Welcome to xephem v2.7.1
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
supports user-defined objects;
comes with sample databases of over 20,000 objects in the release kit;
can access the Hubble Guide Star Catalog from CD-ROM using gscdbd;
Elwood Downey
ecdowney@noao.edu
http://iraf.noao.edu/~ecdowney
August 1995
eric.
erich@FreeBSD.org
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