2024 Solstices And Equinoxes Meaning. Longest day of the year, marking the start of summer. The equinoxes occur around march 20 and september 22 each year, corresponding to an equal length of day and night.
The earth tilts on its. In 2024 the summer solstice will occur on thursday 20 june at 21.51 bst (20.51 gmt).