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equinox

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βˆ™ 11y ago
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βˆ™ 6mo ago

The name given to March 21 and September 21 is the "equinox". This is when day and night are nearly equal in length, marking the beginning of spring (vernal equinox) on March 21 and the beginning of autumn (autumnal equinox) on September 21.

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Q: What is the name given to March 21 and September 21?
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