The autumnal equinox—also called the September equinox or fall equinox—arrives on Thursday, September 22. This date marks the start of fall in the Northern Hemisphere and spring in the Southern Hemisphere. Read about the signs of fall and the ways we mark the equinox. 

When Is the Autumnal Equinox?
The fall equinox arrives on Thursday, September 22, 2022, at 9:04 P.M. EDT in the Northern Hemisphere. The equinox occurs at the same moment worldwide.

What Is the Autumnal Equinox?
The autumnal equinox is an astronomical event that marks the start of autumn (or“fall”). In the Northern Hemisphere, the autumnal equinox occurs in September; in the Southern Hemisphere, it occurs in March. 

What Is an Equinox?
During an equinox, the Sun crosses what we call the “celestial equator”—an imaginary extension of Earth’s equator line into space. The equinox occurs precisely when the Sun’s center passes through this line.

For those in the Northern Hemisphere, when the Sun crosses the equator going from north to south, this marks the autumnal equinox; when it crosses from south to north, this marks the vernal equinox. In the Southern Hemisphere, it’s the reverse.

After the autumnal equinox, days become shorter than nights as the Sun continues to rise later and nightfall arrives earlier. This ends with the winter solstice, after which days start to grow longer once again. 

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