what is autumnal equinox
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The September equinox is the moment when the Sun appears to cross the celestial equator, heading southward. Due to differences between the calendar year and the tropical year, the September equinox can occur at any time from the 21st to the 24th day of September.
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the equinox in autumn, on about 22 September in the northern hemisphere and 20 March in the southern hemisphere.
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