Equinox 2025 Sun. The 2025 september equinox occurs on september 22 at 12:44 utc (7:44 a.m. The spring equinox (march 19, 2025) signals the start of spring in the northern hemisphere, the beginning of autumn in the southern hemisphere, and a rare moment of equal night across the.
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 equinox in the northern.