This lesson is meant to build upon students’ understanding of the Earth-Sun-moon system. Students use a three-level reading guide, in this case called Identify, Infer, Interpret, to closely read a text. The text explains the parts of a shadow, building students’ vocabulary and understanding of the umbra and penumbra. Using this vocabulary, students are then introduced to solar and lunar eclipses. Finally, students may wonder, “Why, if we have one new and one full moon each month, don’t we have t