equi·nox /ˈikwəˌnɑks, ˈɛkwə-/
 晝夜平分點,春分或秋分


 E·qui·nox n.
 1. The time when the sun enters one of the equinoctial points, that is, about March 21 and September 22. See Autumnal equinox, Vernal equinox, under Autumnal and Vernal.
 When descends on the Atlantic
 The gigantic
 Stormwind of the equinox.   --Longfellow.
 2. Equinoctial wind or storm. [R.]

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 equinox
      n 1: either of two times of the year when the sun crosses the
           plane of the earth's equator and day and night are of
           equal length
      2: (astronomy) either of the two celestial points at which the
         celestial equator intersects the ecliptic [syn: {equinoctial
         point]