In mathematics and computer science, an algorithm is an unambiguous specification of how to solve a class of problems.
Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.
The GNU Lesser General Public License (LGPL) is a free software license published by the Free Software Foundation (FSF).
Python is an interpreted high-level programming language for general-purpose programming.
XEphem is a Motif based ephemeris and planetarium program for Unix-like operating systems developed by Elwood C. Downey.