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 itis completely free. Whatis not to like?
Bob Brose walks users through many of the details of compiling XEphem for use under Mac OS X on his Web site. According to Mr. Brose:
Xephem for Mac OSX. Requires XFree86 4.02 (or newer) for Darwin (more info on this is at the Darwinfo site). To run this you need to exit the MacOS GUI and login on the text console where you can startup X. The Darwin developers are working on an open source implementation of XWindows which runs along side of Aqua and itis now working pretty well! See XonX for more info. For a commercial alternative see the Tenon X-TOOLS which uses Aqua as a display device for an X server. This allows X based apps to run inside of Aqua.