Earth's orbit around the sun.
When earth orbits around the sun our seasons change.
Earth has a southern and northern hemisphere.
It is hotter in the summer because our part of the earth is closer to the sun.
It is colder in the winter because our part of the earth is longer away from the sun.
It takes the earth 365 days to orbit around the sun.
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Public - 6/20/16, 2:38 AM