xephem: xephem (Astronomy program) xephem: xephem: XEphem is an interactive astronomy program for all UNIX platforms. xephem: Originally written by Elwood Downey in the 1990s, it has graciously xephem: been released under the MIT License. It is now maintained by an xephem: MIT License. It is now maintained by an "XEphem" organization, xephem: with its source code residing at https://github.com/XEphem/XEphem. xephem: xephem: xephem: xephem: