Autumn Equinox 2024 Southern Hemisphere. 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,. Samhain, imbolc, beltane and lammas, fall on dates that represent high energy in the season.

Australians are now facing six months of longer nights after yesterday marked the southern hemisphere’s autumn equinox. 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.