The first day of fall (autumn) in 2025 is Monday, September 22. This day is known as the Autumnal Equinox, which marks the official start of the fall season in the Northern Hemisphere. The equinox occurs at 2:19 p.m. Eastern Daylight Time (EDT) on that day. It is characterized by nearly equal lengths of day and night as the Sun crosses the celestial equator toward the south.
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