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Originally Posted by gaa_ian
Given this "wobble" on the earths axis of rotation, which must change the angle the sun strikes the earths surface.
I wonder how this effects the cycle of climate on earth ?
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G'day Ian,
The Earth, as you know is tilted by 23.5deg. from the vertical. This angle can in fact change, anywhere between 21.5 and 24.5 deg. over a 41,000 year period. The main wobble in the Earth's rotation is called precession and this alters the direction of the Earth's tilt...not the angle of the tilt.
So you are correct in saying the angle of sunlight hitting the Earth effects climate but this angle will not change due to precession, so the climate will not change due to precession.
Peter.