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Seasons
Clear, detailed technical discussions of seasons, solstices, and equinoxes. Includes the exact dates when spring, summer, fall, and winter arrive. Debunks misconceptions about seasons and the superstition "that it is possible to stand an egg upright on its end [only] on the date of the equinoxes (and/or solstices)." Maintained by scientist Eric Weisstein.
http://scienceworld.wolfram.com/astronomy/topics/Seasons.html

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