Sonia Eleonora

When Is Spring Equinox 2025. An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length. Spring equinox 2025 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic.

The sun will shine directly on the equator and there will be nearly equal amounts of day and night. Similarly, the autumn equinox marks the start of autumn as the night becomes longer.