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To: Brad from Tennessee

Man’s influence on climate is so powerful that no doubt, one day they will discover that we can stop hurricanes by simply spitting in the wind!


31 posted on 03/13/2010 5:07:15 AM PST by MaryFromMichigan (God made us Freepers. Prozac made us friends.)
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To: MaryFromMichigan
MILANKOVIC CYCLES and Climate Change (Wikipedia)

Milankovitch Theory describes the collective effects of changes in the Earth's movements upon its climate, named after Serbian civil engineer and mathematician Milutin Milankovic. Milankovic mathematically theorized that variations in eccentricity, axial tilt, and precession of the Earth's orbit determined climatic patterns on Earth.

The Earth's axis completes one full cycle of precession approximately every 26,000 years. At the same time, the elliptical orbit rotates, more slowly, leading to a 23,000-year cycle between the seasons and the orbit. In addition, the angle between Earth's rotational axis and the normal to the plane of its orbit moves from 22.1 degrees to 24.5 degrees and back again on a 41,000-year cycle; currently, this angle is 23.44 degrees and is decreasing.

Other astronomical theories were advanced by Joseph Adhemar, James Croll and others, but verification was difficult due to the absence of reliably dated evidence and doubts as to exactly which periods were important. Not until the advent of deep-ocean cores and a seminal paper by Hays, Imbrie and Shackleton, “Variations in the Earth's Orbit: Pacemaker of the Ice Ages”, in Science, 1976,[1] did the Milankovic theory attain its present state.

http://en.wikipedia.org/wiki/Milankovitch_cycles

53 posted on 03/13/2010 12:15:09 PM PST by Brad from Tennessee (A politician can't give you anything he hasn't first stolen from you.)
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