The first month is the first month of the lunar calendar. The ancients called the night "Xiao", so the 15th day of the first month is called the Lantern Festival. The 15th day of the first month is the first full moon night of the year. It is also the night when the new year begins and the earth returns to spring. People celebrate it and celebrate the continuation of the new year. Lantern Festival is also known as "Shangyuan Festival".