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Stack #3823630
| Term | Definition |
|---|---|
| Orbit | The path an object follows as it moves around another object. |
| Revolution | The motion of one object around another object. |
| Rotation | A spinning motion. |
| Rotation Axis | The line on which an object rotates. |
| Solstice | A day when the Earth's rotation axis is the most toward or away from the Sun. |
| Equinox | A day when the Earth's rotation axis is leaning along Earth's orbit, neither toward nor away from the Sun. |
| Maria | The large, dark, flat areas on the Moon. |
| Phase | The portion of the Moon or a planet reflecting light as seen from Earth. |
| Waxing Phase | More of the Moon's near side is lit each night. |
| Waning Phase | Less of the Moon's near side is it 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 | When the Moon's shadow appears on the Earth's surface. |
| Lunar Eclipse | Occurs when the Moon moves into Earth's shadow. |
| Tide | The daily rise and fall of the sea. |