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Earth/Moon/Sun 1
| Term | Definition |
|---|---|
| equator | imaginary line that divides Earth into its northern and southern hemispheres |
| equinox | day when Earth's axis is not leaning toward or away from the Sun |
| orbit | path an object follows as it moves around another object |
| revolution | motion of an object around another object |
| rotation | spinning motion |
| rotation axis | line on which an object rotates |
| solstice | day when Earth's rotation axis is the most toward or away from the Sun |