2024 Solstices And Equinoxes Dates. Date (duration) beginning of astronomical winter. In 2024 the autumnal equinox will occur on 22 september at 12.44pm gmt (1.44pm bst).
An equinox is one of two days in the year when the sun crosses the equator and day and night become equal in length. The solstices and equinoxes and the seasons that we experience exist because the axis of rotation of the earth is at an angle of.