This chapter adds a third cycle of importance in astronomy (and human culture): the revolution of the Moon around the Earth. The chapter starts with a simple challenge for the students: putting a series of lunar photographs in order by the shape of the Moon as it would appear if they observed it over a number of weeks. Because the students want to know if their answers are correct, this experience “hooks” them into observing the Moon, which leads to a deeper understanding of lunar phases, the connection of the lunar phase cycle to our concept of the month, and the cause of solar and lunar eclipses. A materials list, teacher background information, and outcomes are provided. This book selection includes the Table of Contents, About the Authors, Introduction, Acknowledgment, References, Internet Resources, and Index.