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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 folllows as it moves around another objects . |
Revolution | The orbit of one object around another object. |
Solstice | When the earths rotation axis is tilled 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 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 |