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First Day Of Spring 2025 Calendar Uk. What you need to know Spring will arrive on thursday, march 20, 2025, and last until june 21, 2024.

The first day of spring (march equinox or vernal equinox) is when the sun shines directly on the celestial equator passing from south to north and the length of day and night are almost the same. 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.