In the first month of spring, the ancients held sacrifices to pray for a good harvest that year.
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Each season has three months named in order with 孟, 仲 and 季, old words for the eldest, middle and youngest of brothers: 孟春, 仲春, 季春 for spring, and 孟夏, 孟秋, 孟冬 to begin the other seasons.