Variable stars have long been favourite targets for amateur astronomers. Nothing demonstrates the dynamic nature of our universe more than variable stars. They vary in brightness, either in a periodic fashion or in an irregular pattern. These can be as simple as eclipsing naked eye stars like beta Lyrae, or pulsating giants like Mira (which provide a yardstick for measuring the distance of other galaxies) or as extraordinary as variable stars that are destroying themselves, like SN1987A.

The rate, period and form of variability tells us a great deal about the star itself a" its physical form, and the processes that drive the variability. Not only are variable stars interesting to observe and analyze, they are also the cornerstone of much of astronomy, yielding secrets of stellar interiors, distances to galaxies, and even demonstrating the basic expansion of the universe.

Variable Stars, and How to Observe Them begins by looking at the physics a" the different types or variable star (and the reasons for the variability) a" and considers the different forms in detail. The second part of the book describes how amateur astronomers can make useful observations with a range of commercially-available instruments, from binoculars, through Dobsonians to larger instruments equipped with advanced CCD cameras.