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：2025/11/20
vernal equinox
（ plural ）
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(astronomy) The moment when the sun appears to cross the celestial equator while tilting towards from the observer, taking place in March in the northern hemisphere and September in the southern hemisphere.
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vernal equinox
Every year, scientists gather at observatories to record the exact time of the vernal equinox.
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Every year, scientists gather at observatories to record the exact time of the vernal equinox.
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