Margery J Jones

Autumn Equinox Australia 2025 Australia. Autumn officially graces australia on march 21st, marking the autumnal equinox. This sunday, the autumnal equinox is upon us, and with it, a shift to shorter days, longer nights and the astronomical start of fall in the northern hemisphere.

Every year, there are two events of equinoxes—the march equinox and the september equinox. But are day and night actually equal length.