The Phases of the Moon put on a fantastic show for astronomers and stargazers alike. The changing phases of the moon have intrigued man for centuries and continue to give today's astronomers a fantastic show. Ancient civilizations depended on the Moon's cycles to determine their days, weeks, months, and religious observances. This video gives today's backyard astronomer the best times to view the Moon, which is during its' quarter phases. Learn more about the Moon's four phases and various moon-related terminology, such as "moon waxing" and "moon waning," "crescent," and "gibbous" shapes. Finally discover how a full moon creates lunar eclipse. Enjoy this and other great astronomy videos at History.com.