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Seasons
why do we have seasons?
| Term | Definition |
|---|---|
| Rotation | the spin of an object around its axis . |
| Rotation axis | The line on which an object rotates . |
| Orbit | The path an object follows as it moves around another object. |
| Revolution | The orbit of one object around another object. |
| Solstice | When Earth’s rotation axis is tilted directly toward or away from the Sun. |
| Equinox | When Earth’s rotation on its axis is tilted neither toward nor away from the Sun. |
| Phase | The tilt part of the moon or a planet that can be seen from the Sun. |
| Waxing phase | phases of the moon which more of the moons near side is lit each night. |
| waning phase | Phases of the moon during which less of the moons near side is lit each night. |
| Umbra | The central darker part of a shadow where light is totally blocked. |
| Penumbra | The lighter part of a shadow where light is blocked. |
| Solar eclipse | An occurrence during which the moons shadow appears on Earths surface. |