"Precession is how the Earth wobbles as it rotates, much like a slightly off-centre spinning top. The angle of this wobble means that sometimes the Northern Hemisphere is closest to the Sun and other times the Southern Hemisphere is closest, meaning that roughly every 10,000 years one hemisphere will have warmer summers compared to the other, before it switches."
Roughly every 10,000 years. How long has it been since the last Ice Age ended? About 11,000 years. Who could have imagined Earth's primary source of heat might influence our climate?
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