2025 Solstice And Equinox Dates
2025 Solstice And Equinox Dates. 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 northern hemisphere to the southern. When do the four seasons start in 2025—for spring, summer, fall, and