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Portal:Ecology/Did you know/5

From Wikipedia, the free encyclopedia
... by astronomical convention, the four seasons are determined by the solstices—the point in the orbit of maximum axial tilt of the Earth toward or away from the Sun—and the equinoxes, when the direction of the tilt and the direction to the Sun are perpendicular?

(Pictured left: Animation of seasonal differences, particularly snow cover throughout the year)

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