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autumnal equinox |
Also found in: Legal, Encyclopedia, Wikipedia, Hutchinson | 0.01 sec. |
autumnal equinox n 1. (Earth Sciences / Physical Geography) the time at which the sun crosses the plane of the equator away from the relevant hemisphere, making day and night of equal length. It occurs about Sept. 23 in the N hemisphere (March 21 in the S hemisphere) (Astronomy) 2. (Astronomy) Astronomy a. the point, lying in the constellation Virgo, at which the sun's ecliptic intersects the celestial equator b. the time at which this occurs as the sun travels north to south (23 September)
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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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