When Is The Fall Equinox 2025 In Canada. Autumn equinox 2025 (beginning of astronomical autumn) on the day of the autumn (september) equinox, the sun, moving along the ecliptic, crosses the celestial equator, moving from the northern hemisphere to the southern. Autumn / fall equinox 2024.
The first day of autumn is in 2025 on september 22 (according to the astronomical definition). Spring equinox 20 march, summer solstice 20 june, autumn equinox 22 september, winter solstice 21 december.
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