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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 |