2024 Solstices And Equinoxes. A guide explaining how earth's tilt and orbit around the sun causes seasons, solstices and equinoxes, and when they are occurring in 2024. 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 vernal equinox marks the. In short, solstices are the longest and shortest days of the year, while equinoxes are dates when day and night are equally long.