There are three theories about the origin of the Double Ninth Festival. The first one comes from the fact that the number of nine Yang in the Book of Changes is equal. The second argument is that before the pre-Qin period, there were activities of offering sacrifices to emperors and ancestors when crops were harvested in September. At that time, there was also the custom of praying for longevity on the Double Ninth Festival. The third argument comes from the sacrificial ceremony, because there is still the custom of worshipping stoves on the Double Ninth Festival in southern China. In the historical development and evolution, the Double Ninth Festival is a mixture of various folk customs, bearing rich cultural connotations. In the folk concept, nine is the largest number in the number, which means longevity, placing people's wishes for the health and longevity of the elderly.
The origin of the name of Chongyang is named after the fact that Yang is nine in the ancient book Yijing. In the Book of Changes, six is defined as the number of yin, nine as the number of yang, and also as the number of poles, which means that the height of the sky is nine times. Nine is Lao Yang, which is the anode number. Two anode numbers are combined, nine are unified, one is started, and Vientiane is updated. Therefore, the ancients thought that Chongyang was an auspicious day to celebrate.