What is the date of the Autumnal (Fall) Equinox?

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Multiple Choice

What is the date of the Autumnal (Fall) Equinox?

The Autumnal (Fall) Equinox is the moment when the Sun crosses the celestial equator heading south, so day and night are roughly equal in length for the Northern Hemisphere. Because Earth's orbit and calendar cause this crossing to fall on slightly different calendar days from year to year, the date typically lands on September 22 or September 23. Among the options, September 23 is the date most commonly used for recent years, which is why it’s chosen as the correct one. September 22 does occur in some years, but September 24 is beyond the usual window for this event, and March 20 is the vernal (spring) equinox, not autumnal.

The Autumnal (Fall) Equinox is the moment when the Sun crosses the celestial equator heading south, so day and night are roughly equal in length for the Northern Hemisphere. Because Earth's orbit and calendar cause this crossing to fall on slightly different calendar days from year to year, the date typically lands on September 22 or September 23.

Among the options, September 23 is the date most commonly used for recent years, which is why it’s chosen as the correct one. September 22 does occur in some years, but September 24 is beyond the usual window for this event, and March 20 is the vernal (spring) equinox, not autumnal.

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