Autumn Equinox 2025 Australia. The autumn equinox is a time where the length of our day is equal to the length of our night. A solstice is the day when the sun is at its highest or lowest.

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. You can also explore the time and date for astronomical seasons summer & winter, solstice spring & autumns.