First Day Of Spring 2025 Uk Time. The equilux is when day and night are equal and occurs a few days before the spring equinox, and a few days after the autumn equinox. School term and holiday dates.
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 first day of spring in the uk astronomically occurs on the vernal equinox, 20 march 2025.