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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.
Click here for more Autumn photos. In the United States and the rest of the northern hemisphere, the first day of the autumn season is the day of the year when the Sun crosses the celestial equator moving southward (on September 22nd or 23rd). This day is known as the Autumnal Equinox.