vernal equinox

Noun
  1. March 21 (synset 115248370)
    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
    subtypes: noruz, nowrooz, nowruz - (Persian) the new year holiday in Iran and Azerbaijan and Afghanistan and Pakistan and parts of India and among the Kurds; comes at the vernal equinox
    is a part of:
    same as: march equinox, spring equinox
  2. (astronomy) the equinoctial point that lies in the constellation of Pisces (synset 108538141)
    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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