2024 Fall Equinox.  — based on the astronomical method of determining the seasons, autumnal equinox marks the beginning of fall. For years, people have perceived it as a symbol of.

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,. 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,.