from Old Farmer's Almanac (www.almanac.com) =
The fall equinox arrives on Wednesday, September 22, 2021, at 3:20 P.M. EDT in the Northern Hemisphere. The equinox occurs at the same moment worldwide.
| Year | Autumnal Equinox (Northern Hemisphere) | Autumnal Equinox (Southern Hemisphere) |
|---|---|---|
| 2021 | Wednesday, September 22 | Saturday, March 20 |
| 2022 | Thursday, September 22 | Sunday, March 20 |
| 2023 | Friday, September 22 | Monday, March 20 |
| 2024 | Sunday, September 22 | Tuesday, March 19 |
WHAT IS THE AUTUMNAL EQUINOX?
Autumn days come quickly, like the running of a hound on the moor.
–Irish proverb
The autumnal equinox—also called the September or fall equinox—is the astronomical start of the fall season in the Northern Hemisphere and of the spring season in the Southern Hemisphere.
WHAT IS AN EQUINOX?
The word “equinox” comes from Latin aequus, meaning “equal,” and nox, “night.” On the equinox, day and night are roughly equal in length. (See more about this below.)
During the 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. When the Sun crosses the equator from north to south, this marks the autumnal equinox; when it crosses from south to north, this marks the vernal equinox.
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