When do the hours of day and night become equal in the autumn?

The hours of day and night become equal during the autumnal equinox, which occurs around September 22-23 each year. This event marks the transition into autumn in the Northern Hemisphere when the sun is positioned directly over the equator. As a result, both hemispheres experience approximately equal amounts of daylight and darkness, giving rise to nearly equal hours of day and night. This phenomenon is a part of the Earth's axial tilt and orbit around the sun, which causes the changing lengths of day and night throughout the year. The other dates provided correspond to different solstices and equinoxes, which do not result in equal hours of daylight and darkness at that time.