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Winter, as with all seasonal variations, is due to the tilt of the Earth's axis with respect to its orbit around the Sun. The relative angle of the Earth to the Sun causes a decrease in the number of daylight hours, and a less vertical angle of sunlight, and hence cooler temperatures. As the Earth orbits the sun, the midpoint of the sunlit area moves from the Tropic of Cancer (23° 26′ 22″ N) to the Tropic of Capricorn (23°26′ 22″ S) and back again (only directly over the Equator twice a year). This causes less solar radiation to reach the northern or Southern Hemisphere. Shorter days and winter for the Northern Hemisphere last from December to February. Shorter days and winter for the Southern Hemisphere last from June to August.

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16y ago

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