Autumn Equinox Australia 2024 Calendar. The summer solstice is also known as the longest day, which is perhaps the most notable feature. 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,.
The online calculator determines the time and date foe summer and winter solstice and spring and autumn. Autumn in australia begins on march 20 or 21 and ends on june 20 or 21, placing it between summer and winter.