Equinox 2024 Vernal. The answer is that the equinox is defined by a specific event, the event in question being when the plane defined by earth’s equator passes through the centre of the sun’s disk. The vernal equinox, the start of astronomical spring, occurred on march 20, 2022 at 11:33 a.m.

Find out when the equinoxes and solstices occur each year from 2017 to 2036. Here’s what to know about how we split up.