Double Ninth Festival, New Year's Eve, Tomb-Sweeping Day and July 30th are also called the four traditional ancestral festivals in China. In addition to the significance of ancestor worship, the Double Ninth Festival also represents thoughts and reunion, and now it also represents gratitude and respect for the elderly. Appreciating autumn and showing gratitude and respecting the elderly are two important themes of the Double Ninth Festival, which advocates the whole society to establish an atmosphere of respecting, filial piety and loving the elderly.
The name of the Double Ninth Festival comes from the name of "Double Ninth Festival", which is named after "Yang is nine" in the ancient book Yijing. In the Book of Changes, "six" is defined as yin number, "nine" is defined as yang number, and "extreme number" means that the height of the sky is "nine times".
"Nine" is the Lao Yang, which is the anode number. The two anode numbers are combined, 1999 is unified, one yuan starts, and Vientiane is updated. Therefore, the ancients thought that Chongyang was an auspicious day to celebrate. In ancient times, there was a custom of drinking to pray for longevity.
On the ninth day of September, the sun and every month meet on the ninth day, which means "the weight of 29", so it is called "double ninth". At the same time, the two yang numbers are combined, so it is called "double ninth". In the Ming Dynasty, Zhang Dai wrote "Night Flight": "Nine is the yang number, and its day coincides with the month, so it is called' Chongyang'."