Spring Equinox 2024 Dates And Times. Spring equinox 2024 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic. 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 2024 (beginning of astronomical spring) on the day of the spring (march) equinox, the sun crosses the celestial equator, moving along the ecliptic. When do the four seasons start in 2024—for spring, summer, fall, and winter?