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The Earth-Moon-Sun
The Earth-Moon-Sun System
| Term | Definition |
|---|---|
| rotation | The spin of a body on it's axis |
| revolution | The motion of a body that travels around another body in space, one complete trip along an orbit |
| solstice | The point at which the sun is as far north or as far south |
| equinox | The moment when the sun appears to cross the celestial equator |
| year | The time required for the earth to orbit once around the sun |