Autumn Equinox 2025 Australia Location. The autumn equinox is a time where the length of our day is equal to the length of our night. This is when autumn 2025.

The days are becoming shorter, and at the equinox, the length of day will be 12hrs. 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.