农历九月九日为重阳节。岁岁重阳，今又重阳。其实，一年之中有五个重阳日，何以独称“九九”为重阳呢？中国古代崇尚“阴阳”学说，连数字也以阴阳来划分。《易》谓“天一地二，天三地四，天五地六，天七地八，天九地十”。《素问》说：“天地之至数，始于一，终于九焉。”这? The ninth lunar month is Chung Yeung Festival. Chung Yeung age, now again Chongyang. In fact, there are five Chongyang days in a year. Why is it called Chung-yang alone? Ancient China advocates the theory of “yin and yang”, even numbers are also divided by yin and yang. “Easy” that “one place two, three days, four days, five days and six days and seven eight days, nine days and ten.” “Su asked,” said: “heaven and earth to a few, began in one, and finally nine yan.” This?