equinox definition, equinox meaning | English dictionary

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equinox

  

      n  
1    either of the two occasions, six months apart, when day and night are of equal length  
   See       vernal equinox       autumnal equinox  
2       another name for       equinoctial point  
     (C14: from Medieval Latin equinoxium, changed from Latin aequinoctium, from aequi- equi- + nox night)  


autumnal equinox  
      n  
1    the time at which the sun crosses the plane of the equator away from the relevant hemisphere, making day and night of equal length. It occurs about Sept. 23 in the N hemisphere (March 21 in the S hemisphere)  
2      (Astronomy)   the point on the celestial sphere, lying in the constellation of Virgo, at which the ecliptic intersects the celestial equator  
vernal equinox  
      n  
1    the time at which the sun crosses the plane of the equator towards the relevant hemisphere, making day and night of equal length. It occurs about March 21 in the N hemisphere (Sept. 23 in the S hemisphere)  
2      (Astronomy)   the point on the celestial sphere, lying in the constellation of Pisces, at which the celestial equator intersects the ecliptic  
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