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Seasons
Why do we have seasons
| Term | Definition |
|---|---|
| Rotation | the spinning 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 | when earths rotation axis is tilted directly toward or away from the sun |
| solstice | when earths rotation axis is tilted directly toward or away from the sun |
| Equinox | when earths rotation axis is tilted neither toward nor away from the sun |
| Phase | The lit part of the moon or a planet that can be seen from earth |
| waxing phase | phases of the moon during 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 partially blocked |
| Solar eclipse | An occurrence during which the moons shadow appears on earths surface |