Autumnal Equinox 2024jj. But the exact start of the season depends on whom you ask. The fall equinox is not on the same day each year, though it always falls between.

Autumnal equinox — is an astronomical phenomenon, when the sun in its visible motion along the ecliptic crosses the celestial equator. Here’s everything you should know about the fall equinox—plus our favorite fall facts, folklore, photos, and.