References for the Celestial Coordinates Program

1. Bicket, Nadine A.; and Gary, Gilmer A.: Celestial Coordinate Transformations. NASA Technical Memorandum 53943, September, 1969
2. Where is M13? from Think Astronomy
3. Equatorial to Galactic conversion tool
4. Universal coordinate converter

Web searches for "Celestial Coordinates" will turn up a number of interesting web sites relating to this subject. And when you come back a month later, you get new web pages!