| Orbit and Insolation |
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| q | Variations in the eccentricity of the orbit cause changes in |
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| the annually averaged amount of sunlight hitting Earth. |
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| q | Variations in the tilt (obliquity variations and the |
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| precession of the tilt) do not affect the averaged amount of |
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| solar radiation to the Earth. |
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| q | The tilt variations affect seasons. |
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