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• n  September 22
• n  (astronomy) the equinoctial point that lies in the constellation of Virgo

• September equinox
• fall equinox

• vernal_equinox

News & Articles

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• Turning the Corner: Tuesday Marks Summer's Midpoint
  Today marks the midpoint of the 2013 northern summer — that moment that comes exactly between the summer solstice and the autumnal equinox.
  Aug. 6, 2013 - Discovery News