Autumn Equinox 2024 Time. 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. Pacific daylight time) autumn begins astronomically.
When is the 2024 fall equinox? The autumn or fall equinox signals the end of summer on the astronomical calendar.
