- the time at which the sun crosses the plane of the equator towards the relevant hemisphere, making day and night of equal length. It occurs about March 21 in the N hemisphere (Sept 23 in the S hemisphere)
| 单词 | vernal equinox |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 ver′nal e′quinox,
Collins Concise English Dictionary © HarperCollins Publishers:: vernal equinox n
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