What rhetoric does Mujiang use when he is happy?

Today is a good day, Mujiang is very happy. The emperor didn't use rhetoric. According to relevant data, this sentence does not use rhetorical devices. This is an auspicious day, a good day. Mu will be happy and happy, and the emperor will take it from Jiuge Donghuang Taiyi. As the first chapter of Nine Songs of the Eastern Emperor Taiyi, it has a special position and significance in the whole poem.