At the autumnal equinox in the northern hemisphere and the vernal equinox in the southern hemisphere, there are approximately .

12 hours of daylight and 12 hours of darkness

Explanation:

Equinoxes are opposite conditions present on the two regions of the equator. This explains the presence of the autumnal equinox in the northern hemisphere and the vernal equinox in the southern hemisphere.

Equinox is characterized by the day and nights having equal and corresponding number of hours. It happens twice in a year.

At the autumnal equinox in the northern hemisphere and the vernal equinox in the southern hemisphere, there are approximately 12 hours of daylight and 12 hours of darkness.