equinoctial : Idioms & Phrases

• (Astron.), the two points where the celestial and ecliptic intersect each other; the one being in the first point of Aries, the other in the first point of Libra.

Webster 1913

• noun the great circle on the celestial sphere midway between the celestial poles
  celestial equator; equinoctial; equinoctial circle.
  

WordNet

• (Astron.), the meridian passing through the equinoctial points.

Webster 1913

• noun the great circle on the celestial sphere midway between the celestial poles
  celestial equator; equinoctial; equinoctial circle.
  

WordNet

• (Astron.), the celestial equator; so called because when the sun is on it, the nights and days are of equal length in all parts of the world. See Equator.

Webster 1913

• noun (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
  equinox.
  

WordNet

• noun a violent rainstorm near the time of an equinox
  line storm.
  

WordNet

• (Astron.) reckoned in any year from the instant when the mean sun is at the mean vernal equinoctial point.

Webster 1913

• noun the time for the earth to make one revolution around the sun, measured between two vernal equinoxes
  tropical year; astronomical year; solar year.
  

WordNet