What Is The Fall Equinox 2025 Dates. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length. 22 or 23 depending on the year.
Autumn 2025 starts on sunday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the. Meanwhile, in the southern hemisphere, it occurs on march 20, 2025, at 09:02 gmt.
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