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Unformatted text preview: Eccentricity Orbit is elliptic Sometimes more circular Perihelion when closest to the sun Aphelion when most distant Variation about every 100000 years Tilt of earth determines difference between summer and winter Tilt varies between 22 and 24.5 degrees 22: mild summer, mild winter 24.5: hot summer, cold winter...
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- Spring '07