Equinox 2024 March. Learn what happens on the first day of spring, when the sun's rays shine directly on the equator, and how the earth's axis affects the seasons. The spring equinox, or vernal equinox, is when the sun crosses the celestial equator and day and night are almost equal in length.
The equinox in the northern hemisphere occurs twice a year around 20 march (the spring equinox) and around 22 september (the autumn equinox). Learn why there is slightly more day than night on the march equinox, due to the sun’s disk shape and atmospheric refraction.
