First Day Of Autumn 2024 Canada 2024. Meanwhile, meteorological fall begins on sept. Autumn equinox 2024 (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.

 — first day of fall 2024. The earth’s fixed tilt as it orbits the sun leads to this day.