China's Double Ninth Festival, also referred to as the Chongyang Festival, takes place every year between October 1 and October 30 on the 9th day of the 9th lunar month. It is a traditional folk holiday focused on good health and long life, with various festivities. Do you know why double ninth is the Chongyang?

Nine is an important number in Chinese culture because its pronunciation means "long" in Chinese. 

According to the Book of Changes, the number six is considered yin while nine is yang. The ninth day of the ninth lunar month in the Chinese calendar features two nines, so the day is given the Chinese name "Chongyang."