Spring Equinox 2025 Northern Hemisphere. Higher latitudes in the northern hemisphere have equal day and night before the march equinox and after the september equinox. 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 seasons are hemisphere dependent. This is also the first day of spring (vernal equinox) in the northern hemisphere and the first day of fall (autumnal equinox) in the southern hemisphere.