autumnal equinox - Dictionary definition and pronunciation - Yahoo! Education
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Definition of autumnal equinox

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autumnal equinox

NOUN:
  1. The point at which the ecliptic intersects the celestial equator, the sun having a southerly motion.
  2. The moment at which the sun passes through the autumnal equinox, about September 23, marking the beginning of autumn in the Northern Hemisphere.



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