On which of the following dates Autumnal Equinox occurs?

Q. On which of the following dates Autumnal Equinox occurs?
Answer: September 23
Notes: During the equinox, either summer or Autumnal equinox, the Sun is exactly above the Equator and day and night are of equal length. It is either of the two points in the sky where the ecliptic (the Sun's annual pathway) and the celestial equator intersect.

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