Why is the ninth day of September called the Double Ninth Festival?

The origin of the name "Chongyang" is named after the Book of Changes, in which "six" is defined as the number of yin, "nine" is the number of yang, and "extreme number" means that the height of the sky is "nine times".

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'.

In ancient times, there was the custom of climbing on the Double Ninth Festival, so it was also called "Climbing Festival". The climbing custom of Chongyang originated from the climate characteristics at this time and the worship of mountains by the ancients. Climbing is also a solar term originated from nature, and climbing on the Double Ninth Festival corresponds to the spring outing of ancient people in spring and March.

The custom of Double Ninth Festival:

In the process of historical continuation, the Double Ninth Festival is a traditional festival in China, which combines many folk customs and cultural connotations. Celebrating the Double Ninth Festival generally includes traveling to enjoy the scenery, climbing high and looking far, watching chrysanthemums, picking Chinese herbal medicines, planting dogwood everywhere, holding old-age banquets, eating double ninth cake, keeping in good health with medicinal wine, drinking chrysanthemum wine and other activities.

The Double Ninth Festival is a season of "clear sky rising, turbid air sinking". The higher the terrain, the more clear the sky, so "climbing to enjoy the clear sky on the Double Ninth Festival" has become a folk custom. Autumn in September, the sky is crisp, this season, climbing high and looking far can achieve the purpose of refreshing, fitness and recuperation.

Baidu Encyclopedia-Double Ninth Festival