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 and students studying introductory astronomy. High-precision spreadsheet methods for greater accuracy are available at www.cambridge.org/practicalastronomy.

The first edition of this very successful book was a winner of the Astronomical Society of the Pacific's "Astronomy Book of the Year" award in 1986. The popularity of the book's programs is based on the ease with which the amateur astronomer can perform calculations on a personal computer. The routines are not specific to any make of computer and are user-oriented in that they utilize a simple version of the BASIC programming language and require only a broad understanding of any particular problem. Seven new subroutines in this new edition can be linked in any combination with the existing twenty-six. Since the programs themselves take care of details, they can be used, for example, to calculate the time of rising of any of the planets in any part of the world at any time in the future or past, or they may be used to find the circumference of the next solar eclipse visible from a particular place. In fact, almost every problem likely to be encountered by the amateur astronomer can be solved by a suitable combination of the routines given in this book. Peter Duffett-Smith is the author of another popular astronomy book: Astronomy with Your Calculator (3rd Edition), also published by Cambridge University Press.