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| Large, round bodies that revolve around a star |
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| The path one body in space takes as it revolves around another body; such as that of the Earth as it revolves around the sun |
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| The spinning of Earth on its axis |
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| To travel in a closed path around an object such as Earth does as it moves around the sun |
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| The star at the center of our solar system |
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| An imaginary line that passes through Earth’s center and it’s North and South Poles |
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| Planetary motion that causes day & night and determines the length of day |
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| Planetary action that determines the length of a year |
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