《礼记·月令》
这个月，天子居住在明堂东部青阳的北室，乘坐饰有用青凤命名的响铃的车子，车前驾着青色的高马，车上插着绘有青龙的旗子，穿着青色的衣服，佩戴青色的饰玉，吃的是麦与羊，使用的器物纹理粗疏而通达。
东风解冻，蛰虫始振，鱼上冰，獭祭鱼，鸿雁来。天子居青阳左个。乘鸾路，驾仓龙，载青旗，衣青衣，服仓玉，食麦与羊，其器疏以达。
In this month, the emperor will live in the North Reading Room of the Azure Yang in the east of Ming Tang, take a carriage with the bell named Azure Phoenix, have a tall Azure Horse in front of the carriage, plant a flag with Azure Dragon, wear Azure clothes, wear Azure ornaments, eat wheat and mutton, and use the utensils with thick yet open textures.