The Burgesses have gathered twenty wonderfully elaborate programs and rewritten most of them for Sinclair 16K BASIC. The programs, divided among the four general categories of time, the planets, the moons, and general tutorial, are all available on tape from the authors, without whose permission storage of the programs is illegal.
Some of the astronomically eloquent programs include sidereal and Julian day conversions; moon and planet positions in the sky; horizon plots for any date, time, and location showing what is where in the sky; and a constellation recognition tutorial. There is even a program dedicated to planetary photographers that calculates, among other things, exposure times for different film speeds, shutter openings, and methods of photography; however, for detailed treatments of the subjects and necessary revisions of some programs, the authors repeatedly refer the reader to Eric Burgess’s Sybex book, Celestial BASIC.