Definitions for vernal equinox
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Random House Webster's College Dictionary
ver′nal e′quinox(n.)
Category: Astronomy
Ref: See under equinox (def. 1). 1
Origin of vernal equinox:
1525–35
Princeton's WordNet
vernal equinox, March equinox, spring equinox(noun)
March 21
vernal equinox(noun)
(astronomy) the equinoctial point that lies in the constellation of Pisces
Wiktionary
vernal equinox(Noun)
the moment when the sun appears to cross the celestial equator, heading northward
vernal equinox(Noun)
the point where the ecliptic intersects the celestial equator at that time
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"vernal equinox." Definitions.net. STANDS4 LLC, 2013. Web. 19 Jun 2013. <http://www.definitions.net/definition/vernal equinox>.

