Sir Patrick Mooreis a former president of the British Astronomical Association, cofounder and former president of the Society for Popular Astronomy, and the author of more than 70 astronomy books, includingCambridge Guide to Stars and Planets,Oxford Astronomy Encyclopedia, andSpace: The First 50 Years.John Masonis a world authority on astronomy. He is a former President of the British Astronomical Association, and is currently Principal Lecturer at the South Downs Planetarium and Science Centre. He is a keen observer of the aurora, total solar eclipses, and meteor showers. He co-edited The Yearbook of Astronomy with Patrick Moore for more than 10 years.