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In 2015, fall begins on September 23rd (at 08:20 UTC) for countries in the Northern Hemisphere (United States, Canada). Fall-Autumn Activities and Games. In 2015, fall begins on March 20th (22:45 UTC) for countries in the Southern Hemisphere (parts of South America, parts of Africa, Australia, and Antarctica).
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.