The equinox being defined as a time of equal day and darkness is a convenient oversimplification.
A carefully phrased response is that on Thursday, September 22nd, at 9:04 p.m. EDT (0104 GMT on Sept. 23)
Autumn begins in the Northern Hemisphere, whereas spring begins in the Southern Hemisphere
The sun would be directly overhead at that time, as seen from a position in the tropical Pacific Ocean.
This date is known as an equinox, which comes from the Latin meaning "equal night
The equinox being defined as a time of equal day and darkness is a convenient oversimplification. For starters,
It considers night to be merely the time when the sun is below the horizon and completely disregards twilight.
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