Interactive Computer Ephemeris 0.51 (ICE) by U.S. Naval Observatory
This powerful DOS program calculates Greenwich hour angle and declination for Sun, Moon, planets, and the navigational stars with a precision equal to that given in the Nautical Almanac. ICE is very similar to the former Floppy Almanac but covers a time span of almost 250 (!) years. Rising, setting, and twilight times are also provided. It further performs sight reduction (including altitude corrections) for any assumed position. Beside its navigational functions, ICE provides highly accurate ephemerides for astronomers. Results can be stored in an output file. ICE, predecessor of MICA (Multiyear Interactive Computer Almanac), is in the public domain now and no longer controlled or supported by USNO. This program is a must!