《论衡·卷二十五·祭意篇》
龙星出现的时候，节气已经到了惊蛰，所以又说： 到了惊蛰就举行雩祭。 
龙星见时，岁己启蛰，□□□： □□而雩。
When the Dragon Star appeared, it was already the "Waking of Insects" solar term, so it was also said: the Rain Dance is held after the "Waking of Insects."