What Day Is The Autumn Equinox In 2024. During the autumnal equinox, day and night are approximately equal in length, lasting around 12 hours each. That's the moment in time when the sun's most direct rays are.

The autumn equinox, or the september equinox, represents the time in the year when the position of the sun is directly above the equator. The september equinox will fall at 12:44 utc (7:44 a.m.