Equilux 2024 Usability. 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. The earth’s axial tilt creates the seasons, but twice a year its movement around the sun aligns with its tilt so that the plane of earth is neither tilted away.

An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length. The simple answer to explain the equinox is it’s the exact time the sun is positioned directly over the earth’s equator.