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Q:

On which day is the autumnal equinox?

  • 1
    22 September
  • 2
    21 September
  • 3
    23 September
  • 4
    20 September
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Answer : 3. "23 September "
Explanation :

Autumn is usually defined in the Northern Hemisphere as the period between the autumnal equinox (day and night equal in length), September 22 or 23, and the winter solstice (year's shortest day), December 21 or 22; and in the Southern Hemisphere as the period between March 20 or 21 and June 21 or 22.


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