autumnal equinox

Noun
  1. September 22 (synset 115248546)
    is a type of: equinox - 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
    is a part of:
    • sep, sept, september - the month following August and preceding October
    • autumn, fall - the season when the leaves fall from the trees
    same as: fall equinox, september equinox
  2. (astronomy) the equinoctial point that lies in the constellation of Virgo (synset 108538295)
    referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
    is a type of: equinoctial point, equinox - (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic

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