Montenbruck, Oliver & Pfleger, T: Astronomy on the Personal Computer
With CD-ROM, including source code. Progresses from co-ordinate transformations to advanced methods for planetary positions, purturbations, eclipses, occultations, etc.
Duffett-Smith, Peter J.: Practical Astronomy with your Calculator or Spreadsheet
Now in its fourth edition, this highly regarded book is ideal for those who wish to solve a variety of practical and recreational problems in astronomy using a scientific calculator or spreadsheet. Updated and extended, this new edition shows you how to use spreadsheets to predict, with greater accuracy, solar and lunar eclipses, the positions of the planets, and the times of sunrise and sunset. Suitable for worldwide use, this handbook covers orbits, transformations and general celestial phenomena, and is essential for anyone wanting to make astronomical calculations for themselves. With clear, easy-to-follow instructions for use with a pocket calculator, shown alongside worked examples, it can be enjoyed by anyone interested in astronomy, and will be a useful tool for software writers.
Meeus, Jean: Astronomical Algorithms
This is the book to get if you want to know how to do astronomical calculations. Meuss is the undisputed master of this branch of astronomy. Highly recommended. (Out of print, but very much in demand, so new prices can be very high; it is only this high price that prevents it being the top recommended book in this section.)
Meeus, Jean: Mathematical Astronomy Morsels
Meeus detects interesting patterns and cycles in astronomical phenomena; blue moons, planetary groupings, sunspots, and very much more. (Out of print, but worth seeking a used copy.)
Green, R.M.: Spherical Astronomy
An introductory textbook on spherical and positional astronomy, entirely suitable for use by students with no prior knowledge of classical astronomy, sufficiently comprehensive to make it a useful background reference book for anyone engaged in practical astronomy. Worked examples and problems ensure that this is a valuable textbook.