Sunset Autumn Equinox 2025 Calendar

Sunset Autumn Equinox 2025 Calendar. 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. The sun will shine directly on the equator and there will be nearly equal amounts of day and night throughout the world.

At the september equinox, the sun is moving from north to south as it crosses above the equator. The first day of autumn is in 2025 on september 22 (according to the astronomical definition).