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：2025/11/21
autumnal equinox
（ plural ）
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(astronomy) The moment when the sun appears to cross the celestial equator while tilting away from the observer, taking place in September in the northern hemisphere and March in the southern hemisphere.
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autumnal equinox
On the autumnal equinox, astronomers note the moment when the sun appears to cross the celestial equator, marking the change of seasons in the northern hemisphere.
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On the autumnal equinox, astronomers note the moment when the sun appears to cross the celestial equator, marking the change of seasons in the northern hemisphere.
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