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 descending equinox

The descending equinox or autumnal equinox is the equinox at which the Sun moves from north to south of the celestial equator. At that moment, spring starts in the southern hemisphere and autumn in the northern hemisphere. In the Gregorian calendar, the descending equinox is near 23 September.