A season ends and starts on either an equinox or a solstice (whichever it starts with it will end with the opposite). Fall starts on the Autumn Equinox and ends on the Winter Solstice. However, Equinoxes and Solstices do not stay on the same day every year. The Autumn Equinox starts on either September 22 or September 23 and the Winter Solstice starts on either December 21 or December 22. So Fall starts in Europe on September 22/23 and ends on December 21/22.
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