Summer Equinox 2024 Timeline. Meanwhile, the southern hemisphere experiences the winter solstice. Therefore, on the day of the summer solstice, the sun appears at its highest elevation with a noontime position that changes very little for several days before and after the summer solstice.
In 2024 the autumnal equinox will occur on 22 september at 12.44 gmt (01.44 bst). Equinoxes and solstices are two of the most important celestial events on earth.