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autumnal equinox

See under equinox (def 1).
Also called autumnal point. the position of the sun at the time of the autumnal equinox.
Origin of autumnal equinox
1670-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for autumnal point

autumnal equinox

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)
  1. the point, lying in the constellation Virgo, at which the sun's ecliptic intersects the celestial equator
  2. the time at which this occurs as the sun travels north to south (23 September)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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autumnal point in Science
autumnal equinox
See under equinox.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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