This is a snapshot taken of Christophe David's implementation of Jean Meeus's Astronomical Algorithms. I originally downloaded this in 2011, and the files in the zip file all contained timestamps from 2001.
The original seems to have dropped off the internet, so I've uploaded it to preserve it. If anybody knows of an "official" location for this code, please let me know.
See AstronomicalAlgorithms.h for the license.
This code does not include anything related to the planets.