The first three editions of NightWatch sold more than 600,000 copies, making it the top-selling stargazing guide in the world for the last 20 years. The key feature of this classic title is the section of star charts that are cherished by backyard astronomers everywhere. Each new edition has outsold the previous one because of thorough revisions and additional new material. This NightWatch Book, 4th Edition, includes for the first time, star charts for use in the southern hemisphere. There are also dozens of new photographs throughout the book that show the latest thrilling discoveries made by current space observatories and probes.