equinox

Noun
  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 (synset 115248139)
    is a type of: cosmic time - the time covered by the physical formation and development of the universe
    subtypes:
  2. (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic (synset 108537911)
    referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
    is a type of: celestial point - a point in the heavens (on the celestial sphere)
    subtypes:
    • vernal equinox - (astronomy) the equinoctial point that lies in the constellation of Pisces
    • autumnal equinox - (astronomy) the equinoctial point that lies in the constellation of Virgo
    same as: equinoctial point

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