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vernal equinox

ver·nal e·qui·nox (plural ver·nal e·qui·nox·es)


noun 
Definition:
 
1. beginning of spring: the time when the Sun crosses the celestial equator and day and night are of equal length, marking the beginning of spring. In the northern hemisphere this is around March 21, in the southern hemisphere around September 23.

2. intersection of celestial equator and ecliptic: the point on the celestial sphere where the path of the Sun ecliptic crosses the celestial equator, in the constellation Pisces

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