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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 | Jane 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 a planet that can be seen from earth |
Waxing phase | Phases of the moon during which more of the moon’s near side is 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 |