Vernal Equinox 2024 Uk. But did you know there are actually three main definitions for the season coming from astronomy, meteorology and phenology? The equinox in the northern hemisphere occurs twice a year around 20 march (the spring equinox) and around 22 september (the autumn equinox).
Astronomical spring, discussed here, relies on earth’s position in its orbit, commencing with the vernal equinox. The table below shows the dates and times of both the vernal (spring) and autumnal equinoxes:
