The ancients gave the moon many legends, from the toad in the middle of the moon to the jade rabbit, from Wu Gang to the Goddess Chang'e flying to the moon, and the rich imagination painted a beautiful scene of many-hued for the moon palace world. From the Han Dynasty to the Tang Dynasty, poets and poets chanted about the moon and its events, and the full moon on August 15th became an excellent moment to express their feelings. During the reign of Emperor Taizong of the Northern Song Dynasty, the official officially designated August 15th as the Mid-Autumn Festival, which was intended to be in the middle of Sanqiu, and all the people would celebrate it at that time. On the night of Mid-Autumn Festival, the bright moon is in the sky, and the radiance is scattered all over the earth. People regard the full moon as a symbol of reunion and August 15th as the day for family reunion. Therefore, the Mid-Autumn Festival is also called "Reunion Festival".