Equilux 2024 Ukt. Because of these two factors, the date when day and night are exactly equal is called the equilux, which occurs a few days after the autumn equinox. Spring equinox 20 march, summer solstice 20 june, autumn equinox 22 september, winter solstice 21 december.

In 2024 the autumnal equinox will occur on 22 september at 12.44pm gmt (1.44pm bst). This is because the sun appears as a disk in the sky, and the top half rises above the horizon before the.