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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 axis is tilted neither toward nor 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 moon’s near side is lit each night |
| waning phase | phases of the moon during which less of the moon’s 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 moon’s shadow appears on earth’s surface |
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