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nox) lasts nearly 5 days longer than our winter season. And, of course, the corresponding seasons in the Southern Hemisphere are opposite. Southern Hemisphere winter is nearly 5 days longer than Southern Hemisphere summer. • It's all due to the shape of Earth's orbit. The shape is an ellipse, like a circle someone sat down on and squashed. The elliptical shape of Earth's orbit causes the variation in the length of the seasons - and brings our closest point to the sun, in 2013 on January 2, at 5:00 Universal Time.
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