Autumnal Equinox 2024 Uk Calendar. On this day, days and nights are approximately (but not exactly) equal in length for everyone across. However, the astronomical calendar is based on the position of the sun in relation to the earth and changes.

Sunday, the 22nd of september 2024. In 2024 the autumnal equinox will occur on 22 september at 12.44pm gmt (1.44pm bst).