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Most Popular. Thursday, September 22, is the date of the autumn equinox, the first official date of fall. The equinox marks the day when there are exactly 12 hours of sunlight, and marks the changing of the seasons. And with modern day science, we can narrow it down not just to the day, but to the very minute.
The autumnal equinox occurs on September 22 or 23, and the season continues until the winter solstice on December 21 or 22. The winter solstice has the longest night and the shortest amount of daylight of the year. Autumn is also known as fall because it is the season in which leaves fall from deciduous trees.