| Term | Definition |
|---|---|
| phase | A stage in the series of changes in the apparent shape of the moon |
| tilt | to slope or to slant |
| axis | the imaginary line on which an object rotates; the imaginary line from the North Pole, through Earth's center, to the South Pole |
| rotation | the spinning motion of an object on its axis |
| Sun | the star that is the central body of our solar system |
| lunar eclipse | the darkening of the moon when it moves into Earth's shadow |
| revolution | the movement of an object around another object or point |
| solar system | the Sun and planets and the other objects that orbit the Sun |
| seasons | any of the four parts of the year |
| orbit | the path a planet, moon, or other object takes around another |
| moon | a natural object that revolves around a planet |
