Autumn Equinox 2025 South Africa Date. This page gives the day length in hours, minutes and seconds on solstice day, including previous and next day. Autumn equinox 2025 (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 northern hemisphere to the southern.

Equinox means equal day and night (12 hours each). Autumn 2025 starts on monday, september 22nd in the northern hemisphere, with daylight time shortening and the leaves begining to fall with the changing tilt of the earth’s axis.