In which poetry document did the word "Mid-Autumn Festival" first appear?

Five laws. Night thoughts on the Mid-Autumn Festival

The full moon did not return, and tears fell several times.

Sleep together and wake up feeling sad.

Go to Qiu Lai in spring.

Ask Nan Feiyan, who is the letter addressed to?

Mid-Autumn Festival, also known as Moon Festival, Autumn Festival, Mid-Autumn Festival, August Festival, Moon Chasing Festival, Moon Appreciating Festival, Daughter's Day or Reunion Festival, is a popular traditional cultural festival in many ethnic groups and countries in the Chinese character cultural circle in China, and falls on the 15th day of the eighth lunar month. Because its value is only half that of Sanqiu, it is named, and some places set the Mid-Autumn Festival on August 16.

The Mid-Autumn Festival began in the early years of the Tang Dynasty and prevailed in the Song Dynasty. By the Ming and Qing Dynasties, it had become one of the major festivals in China, which was as famous as the Spring Festival. Influenced by China culture, Mid-Autumn Festival is also a traditional festival for overseas Chinese in some countries in East and Southeast Asia, especially local Chinese.

According to historians, the custom of appreciating the moon in Mid-Autumn Festival was first put forward by ancient court scholars and later spread to the people. As early as the Wei and Jin Yuefu's Forty Poems of Midnight, there was a poem "There is a bright moon in autumn" saying: "Look up at the bright moon and send your feelings for thousands of miles." In the Tang Dynasty, it was quite popular to enjoy and play with the moon in the Mid-Autumn Festival. Many poets wrote poems about the moon in their masterpieces, and the Mid-Autumn Festival began to become a fixed festival.

The Book of Emperor Taizong recorded the Mid-Autumn Festival on August 15. Legend has it that Xuanzong of the Tang Dynasty sleepwalked in the Moon Palace and got colorful feather clothes, and the custom of Mid-Autumn Festival began to prevail among the people.

Mid-Autumn Festival has many nicknames: it is called "August Festival" and "August and a half" because it falls on August 15th; Because the main activities of the Mid-Autumn Festival are all around the moon, it is also commonly known as the "Moon Festival" and "Moon Festival". The full moon in Mid-Autumn Festival symbolizes reunion, so it is also called "Reunion Festival".