Subscription required to access electronic articles. Subscription required to access articles. The official report of the next 10 years of astronomy. Numerical Recipes Books Online in Fortran, C, and Fortran 90. This link is to the FTP site, which includes the minimal documentation and downloadable source code.
FITS files contain information for overlaying celestial coordinates, perfect for finding charts.
Click here for the IRAF commands for overlays. It's not that I really play bagpipes, or even that I really like them. But, in my eternal quest for an unusual addition to my life, I've found this.