When Is Equinox 2024. 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.

Published wed, may 22 202412:00 pm edt. Here are the equinox and solstice dates—plus, answers to common questions about the seasons of the year in north america.