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Seasons
why we have seasons
| Term | Deffiniton |
|---|---|
| Rotation | spin around the 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 earths rotation axis is tilted directly toward or away from the sun |
| Equinox | when earths rotation axis is tilted neither toward or away from the sun |
| Phase | the lit part of the moon or 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 partially blocked |
| Penumbra | the lighter part of a shadow where light is partially blocked |
| solar eclipse | an occurrence during which of the moons shadow appears on earths surface |