| A | B |
|---|
| eclipse | When the moon's shadow hits Earth or Earth's shadow hits the moon |
| gravity | What pulls the Earth and moon toward each other |
| solar eclipse | When the moon passes between Earth and the sun |
| lunar eclipse | When Earth is directly between the moon and the sun |
| rotation | The spinning motion of a planet around its axis |
| astronomy | The study of the moon you see from Earth |
| phases | The shapes of the moon you see from Earth |
| axis | The imaginary line that passes through Earth's center and the North and South poles |
| solstice | The two days of the year on which the sun is directly overhead at either 23.5% north or south |
| orbit | Earth's path as it revolves around the sun |
| revolution | The movement of one object around another object |
| tide | the rise or fall of the level of water in the ocean |
| crater | A round pit on the moon's surface |
| umbra | the darkest part of a shadow |
| maria | Dark, flat areas on the moon's surface |
| penumbra | The part of a shadow that surrounds the darkest part |
