Winter Equinox 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 2024 september equinox will fall at 12:44 utc (7:44 a.m.
The equilux is when day and night are equal and occurs a few days before the spring equinox, and a few days after the autumn equinox. The 2024 december solstice takes place on december 21, at 9:21 utc.