Milankovitch Cycles - NSF
Milankovitch Cycles: 100 kyr cycle Eccentricity (Elliptical); 41 kyr cycle - Obliquity (tilt); 21kyr/26kyr cycle - Precession (wobble cycle). The forcing imposed or taken away from the earth climate system combined with the amount of land surface in the northern hemisphere and distance from the sun of the earth orbit regulate the long term natural cycles that regulate climate on earth. Source: National Science Foundation: http://www.nsf.gov/news/special_reports/scivis/popup/mil.jsp
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