维基上找的。The Mid-Autumn Festival is a harvest festival celebrated by ethnic Chinese and Vietnamese peoples. The festival is held on the 15th day of the eighth month in the Chinese Han calendar and Vietnamese calendar (within 15 days of theautumnal equinox), on the night of the full moon between early September to early October of the Gregorian calendar.The holiday is also celebrated in Korea (Chuseok) and Japan (Tsukimi).The festival celebrates three fundamental concepts which are closely tied to one another:Gathering, such as family and friends coming together, or harvesting crops for the festival.Thanksgiving, to give thanks for the harvest, or for harmonious unionsPraying (asking for conceptual or material satisfaction), such as for babies, a spouse, beauty, longevity, or for a good futureTraditions and myths surrounding the festival are formed around these three concepts, although traditions have changed over time due to changes in technology, science, economy, culture, and religion.