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| The imaginary line that passes through Earth's center and the North and South Poles. [image] |
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| The study of the moon, stars, and other objects in space.[image] |
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| The spinning of Earth on its axis.[image] |
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| The movement of one object around another.[image] |
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| The path of an object as it revolves around another object in space.[image] |
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| The 2 days of the year on which the sun reaches its greatest distance north or south of the equator. |
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| The two days of the year on which neither hemisphere is tilted toward or away from the sun. |
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