Book excerpt: Philip's Moon Observer's Guide is a practical guide for Moonwatchers, suitable for both beginners and more experienced observers. Peter Grego, a well-known Moon expert, shares his enthusiasm and expertise in this informative book. Features on the Moon are best seen when they are close to the day-night line, known as the terminator. At the heart of Philip's Moon Observer's Guide is a day-by-day lunar observing diary based on the progress of the terminator. Using detailed sections of Moon map for each day, the author explains when to look for which features, enabling you to plan your own lunar explorations. Colourful diagrams, stunning close-up images and straightforward text explain the origin and appearance of the different types of surface feature. Eclipses are always eagerly followed by astronomers, and the author explains the best way to observe and record these fascinating events. Philip's Moon Observer's Guide is divided into seven chapters: Lunar geology and the Moon's features The Moon in space The lunar observer's equipment Moonwatching Recording your observations Eclipses and occultations The space-age Moon Philip's Moon Observer's Guide also includes a glossary of terms as well as details of a number of astronomical societies and groups, together with useful Internet resources.