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Chapter 1:

The Earth, Moon, and Sun

The spinning motion of the Earth around its axis. rotation
The study of the moon, stars, and other objects in space. astronomy
The differenct shapes of the moon you see from Earth. phases
The imaginary line that passes through Earth's center and the North and South poles. axis
The two days of the year on which the sun reaches its greatest distance north or south of the equator. solstice
Earth's path as it revolves around the sun. orbit
The movement of one object around another. revolution
The cyclical rise or fall of ocean water. tide
A pit on the moons surface. crater
The dark, flat areas on the moon's surface. maria
The darkest part of the moon's shadow. umbra
The part of a shadow that surrounds the darkest part. penumbra
Created by: halerz