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autumnal equinox

   Also found in: Legal, Encyclopedia, Wikipedia, Hutchinson 0.03 sec.
autumnal equinox
n.
1. The point at which the ecliptic intersects the celestial equator, the sun having a southerly motion.
2. The moment at which the sun passes through the autumnal equinox, about September 23, marking the beginning of autumn in the Northern Hemisphere.

autumnal equinox  (ô-tmnl)
See under equinox.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.autumnal equinoxautumnal equinox - September 22
Sep, Sept, September - the month following August and preceding October
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
autumn, fall - the season when the leaves fall from the trees; "in the fall of 1973"
2.autumnal equinox - (astronomy) the equinoctial point that lies in the constellation of Virgo
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
equinoctial point, equinox - (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic

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It was by my account the 30th of September, when, in the manner as above said, I first set foot upon this horrid island; when the sun, being to us in its autumnal equinox, was almost over my head; for I reckoned myself, by observation, to be in the latitude of nine degrees twenty-two minutes north of the line.
 
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