The spring equinox falls in mid-spring, and on that day the day and the night are the same length.
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culture
The three months of each season are named with 孟, 仲 and 季, old words for the eldest, middle and youngest of brothers: 孟春, 仲春, 季春 for spring, and likewise 仲夏, 仲秋, 仲冬. 仲秋, the eighth month, is when the Mid-Autumn Festival, 中秋节, falls.