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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.
By NINA RUGGIERO September 22, 2014. In many of our hearts and minds, the start to fall is not scientific. It's the moment the air gets cooler, the moment we slip on our first sweater, the moment we order our first pumpkin spice latte. But fall does not begin in the Northern Hemisphere, officially, until the minute the autumnal equinox strikes. Here's a quick explainer.