Spring Equinox 2025 Northern Hemisphere. 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. 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.
The spring equinox 2025 is a significant astronomical event that marks the beginning of spring in the northern hemisphere and autumn in the southern hemisphere. 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.