Earth's Movements and Phases

Front

Revolution

Back

The movement of an object around another object

Front

Rotation

Back

The spinning of Earth (or the moon) on its axis

Front

Rotation axis

Back

The line on which an object rotates

Front

Phase

Back

The portion of the Moon or a planet reflecting light as seen from Earth

Front

Waxing phase

Back

The lit portion of the moon is getting larger each night, going from new moon to full moon

Front

Waning phase

Back

The lit portion of the moon is getting smaller each night, going from full moon to new moon.

Front

Milky Way Galaxy

Back

The spiral galaxy that contains our solar system.

Front

Solar system

Back

Sun, planets, and all the other objects that revolve around the sun.

Front

Umbra

Back

The very darkest part of the moon or Earth's shadow.

Front

Penumbra

Back

The lighter part of a shadow where light is partially blocked.