What Day Is The Autumnal Equinox 2024 Uk. The autumn equinox usually occurs on the 22nd or 23rd september, but it has been known to occur on the days on either side of those dates. Autumnal equinox โ is an astronomical phenomenon, when the sun in its visible motion along the ecliptic crosses the celestial equator.
When is the fall equinox 2024. In 2024, the autumnal (fall) equinox arrives on sunday, september 22, marking the official first day of fall.
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