Autumnal Equinox Day 2025. When is the fall autumnal equinox? Autumnal equinox โ€” is an astronomical phenomenon, when the sun in its visible motion along the ecliptic crosses the celestial equator.


Autumnal Equinox Day 2025

Equinox means equal day and night (12 hours each).it is a time for balance. The 2025 autumnal equinox will occur on september 22, 2025, at 14:21 utc (coordinated universal time).

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