The Double Ninth Festival originated from the worship of astronomical phenomena and began in ancient times. According to the existing historical data and textual research, there were activities of offering sacrifices to heaven and ancestors in harvest season and autumn in ancient times. According to Lu Chunqiu's Qiu Ji, the ancients offered sacrifices to the Heavenly Emperor and ancestors during the harvest season in September to thank them for their kindness. This is the original form of the Double Ninth Festival as an autumn harvest sacrifice activity.
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The origin of the name "Chongyang" was named after "Yang is nine" in the ancient book I Ching. 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".
Baidu Encyclopedia-Double Ninth Festival