Before jumping to code coordinate transformation I urge you to read about the WCS library. http://www.atnf.csiro.au/computing/software/wcslib.html This library implement coordinate changes between 25 coordinate systems. There are published paper defining the coordinate system and conventions. This documentation is normally what is missing when you try to use coordinate transformation code from somebody else. The library is tied to the FITS format but a port to a root class for describing coordinate will be fantastic to have. This library is in general use in the astrophysics community so it is well tested/debugged. Cheers -- Nicolas Produit INTEGRAL Science Data Center Phone: +41 22 950 91 40 16, Chemin d'Ecogia Fax: +41 22 950 91 33 CH-1290 Versoix www: http://isdc.unige.ch/
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