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https://www.evernote.com/shard/s550/sh/f3875456-9911-38ba-ddf1-deb71195e113/18eea600ac18028a5e3153582ed12a21
In astronomical phrases, the spring equinox (also vernal equinox or March equinox) is the precise position in the entire year once the earth’s axis is tilting neither towards or from the sun and it’s directly over the equator.