Yes, during an equinox the length of the day and the length of the night are actually the same.
During the Autumn equinox the length of the day and night are nearly equal. The length of the day on the equinox is approximately twelve hours.
It's called an Equinox.
equal day and night
The length of day and night is equal at the Vernal and Autumnal equinox.
An equal day and night occurs twice per year on the summer and winter equinox.
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equinox
Day and night hours.
equinox
The Autumn equinox and the Spring equinox .
In the Spring and Fall equinox, night and day have the same number of hours. Equi = equal.
The equinox is when, twice each year, day and night are of equal length (about 22 September and 20 March).