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September 23 at 12:55 am Eastern Daylight Time, which makes it September 22 for the rest of the US: 11:55 pm Central Daylight time; 10:55 pm Mountain daylight time and 09:55 Pacific daylight time.

The odd time is due to the fact that Fall begin when the sub-point of the sun crosses the equator. That mean the sun is directly over the equator heading south when Fall officially begins.

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16y ago

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