Time: 15th day of the first lunar month English: Lantern Festival is also called "Shangyuan Festival", that is, 15th day of the first lunar month. This is an important traditional festival in China. In ancient books, this day is called Shangyuan, and its night is called Yuanye, Yuanxi or Yuanxiao. The name Yuanxiao has been used ever since. Customs Because of the custom of putting lanterns and watching lanterns in the Lantern Festival, people also call it the Lantern Festival. In addition, there are customs such as eating Yuanxiao, walking on stilts and riddles. The evolution of ancient calendars in China is closely related to the phases of the moon. On the fifteenth day of the first month, people ushered in the first full moon night of the year, which is naturally regarded as an auspicious day. As early as the Han Dynasty, the fifteenth day of the first month has been regarded as a day of offering sacrifices to gods and praying for blessings. Later, the ancients called the fifteenth day of the first month Shangyuan, the fifteenth day of July Zhongyuan and the fifteenth day of October Xia Yuan. At the latest, in the early Southern and Northern Dynasties, Sanyuan was the day when grand ceremonies were held. Of the three elements, Shangyuan is the most valued. Later, the celebrations in the Central Plains and Xia Yuan were gradually abolished, but Shangyuan was enduring.