1. The 9th day of the 9th lunar month is the traditional Chongyang Festival, or Double Ninth Festival.

It usually falls in October in the Gregorian calendar. In an ancient and mysterious book Yi Jing, or The Book of Changes, number 6 was thought to be of Yin character, meaning feminine or negative, while number 9 was thought to be Yang, meaning masculine or positive.

So the number nine in both month and day create the Double Ninth Festival, or Chongyang Festival. Chong in Chinese means double.

Also, as double ninth was pronounced the same as the word to signify forever, both are Jiu Jiu, the Chinese ancestors considered it an auspicious day worth celebration. Thats why ancient Chinese began to celebrate this festival long time ago.

2. The ninth day of the ninth lunar month is the traditional Double Ninth Festival. Because the ancient "Book of Changes" defines six as a yin number and nine as a yang number. On September 9th, the sun and moon are yang, and the two nines overlap, so it is called the Double Ninth Festival, also called the Double Ninth Festival. The ancients thought it was a worthwhile day. It is an auspicious day to celebrate, and this festival starts very early. In ancient times, people had the custom of climbing on the Double Ninth Festival, so the Double Ninth Festival is also called the Climbing Festival. According to legend, this custom began in the Eastern Han Dynasty. Literati in the Tang Dynasty wrote many climbing poems, most of which were about the customs of the Double Ninth Festival; Du Fu's seven-character "Climbing the High" is a famous poem about climbing on the Double Ninth Festival. There are no uniform rules for climbing wherever you go. Generally, you climb mountains and towers.