Fall Equinox 2024. — autumnal equinox, two moments in the year when the sun is exactly above the equator and day and night are of equal length; The sun entries into the 4 cardinal.
— when does fall start in 2024? 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,.