Terence Dickinson is a prolific science writer specializing in astronomy. More than one million copies of his 14 books are in print in five languages. His best-known book, NightWatch: A Practical Guide to Viewing the Universe, is widely regarded as the essential guidebook for beginning stargazers. NightWatch, first published in 1983, now has over 600,000 copies in print, making it the top-selling stargazing guide in the world during the past 20 years. Each new edition has outsold the previous one because of extensive revisions and the addition of new material.