Astronomy Answers: From the Astronomical Dictionary

Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

the ascending equinox

The ascending equinox or vernal equinox is the equinox at which the Sun moves from south to north of the celestial equator. At that moment, spring starts in the northern hemisphere and autumn in the southern hemisphere. In the Gregorian calendar, the ascending equinox is near 21 March.