Chongyang Festival, also known as Ascension Festival, Elderly Festival, a traditional Chinese folk festival, is celebrated on the 9th day of the 9th day of the 9th lunar month. The "nine" number is the yang number in the I Ching, and the "99" is the same as the two yang numbers, so it is called "Chongyang"; because the sun and the moon are nine, it is also called "Chongjiu". 99 returned to the truth, the first yuan began, and the ancients believed that 99 layers of the sun was an auspicious day.