XEphem is a full-fledged planetarium and astronomy laboratory for Unix-like systems, such as Linux, FreeBSD and Solaris. Ports to OS/2 and Mac OS X are planned.

"XEphem, the brainchild of programmer Elwood Downey, is a star-charting sky-simulating, ephemeris-generating celestial virtuoso that can do just about everything that the usual Windows and Macintosh star-charting software can do -- and sometimes quite a bit more. And it's completely free. What's not to like?"
- Jeff Medkeff, Xceptional Astronomical Software, Sky and Telescope, Feb 2000

The official Web-site for this phenomenal piece of software is http://www.clearskyinstitute.com/xephem/

XEphem is a star map display and ephemeris calculation program for UNIX-based systems. It is based upon the GUI toolkit Motif. There are many catalogs available for use and extension of the program.

It is written by Elwood Downey, and is available at http://www.clearskyinstitute.com/xephem/

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