Skycalc is a most useful astronomical almanac calculator by Prof. John
Thorstensen, my former Ph.D. thesis advisor. Please don't e-mail Prof.
Thorstensen: if you have questions or problems with this software,
e-mail me.
Click here to download a compiled copy of skycalc.exe, which should be ready to run on a PC
running either Windows or MS-DOS.
Here is the c code for the program,
skycalc. It was written in plain C so it can run on most anything.