《明史·志·卷三十七》
夏言又援引古代苍龙星出现便举行祈雨的祭祀，命令乐正练习盛大乐曲，舞盛大的舞蹈。
夏言又引古者龙见而雩，命乐正习盛乐，舞皇舞。
Xia Yan also cited ancient times, when the Azure Dragon star appeared, a sacrificial ritual was held to pray for rain, and ordered Le Zheng to practice grand music and a grand dance.