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GLOBAL CLIMATE CHANGE, Milankovitch, 2003_226335main_earthsun_200803XX_HI…
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Milankovitch
Eccentricity
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Currently, Earth’s eccentricity is near its least elliptic (most circular) and is very slowly decreasing, in a cycle that spans about 100,000 years.
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Precession
As Earth rotates, it wobbles slightly upon its axis,this wobble is due to tidal forces caused by the gravitational influences of the Sun and Moon that cause Earth to bulge at the equator, affecting its rotation
The cycle of axial precession spans about 25,771.5 years.
Axial precession makes seasonal contrasts more extreme in one hemisphere and less extreme in the other.
In about 13,000 years, axial precession will cause these conditions to flip, with the Northern Hemisphere seeing more extremes in solar radiation and the Southern Hemisphere experiencing more moderate seasonal variations.
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