Monday, Sept. 22 is what many consider the first official day of fall: The fall equinox.

The equinox marks the moment when the Sun crosses the equator, marking the start of autumn in the Northern Hemisphere.

The exact moment of the equinox today is 1:19 p.m. CDT.

An equinox occurs twice every year, in March and September.

On the day of an equinox, those at the equator will see the Sun directly overhead at noon.

The word “equinox” originates from Latin, and translates to equal (equi-) night (-nox).

However, the length of day and night on the equinox aren’t exactly equal; the date for that split depends on your location and can happen a few days earlier or later than the equinox itself, according to NASA.

For Birmingham, today will actually have 12 hours, seven minutes and 50 seconds

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