The change of seasons is caused by the earth’s tilt. The earth is rotating, but also revolves around the sun, so for half the year the Southern Hemisphere receives more light exposure than the northern. Our word “solstice” comes from this idea – sol, “sun”, and “sistere”, to stand still.
The change in seasons is caused by the 23.5-degree tilt of the Earth’s axis. Because the Earth is rotating, it points in the same direction. But since it is also revolving around the sun, during half of the year the Southern Hemisphere is more exposed to the sun than the Northern Hemisphere.
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