Fall Equinox 2024 Date. This is the first day of astronomical summer and occurs as. Find out how earth's axis and.

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. After the vernal equinox, the length of night continues to shorten and daylight hours increase until the summer solstice arrives.