What is the cultural basis for the ancients to describe the emperor with the number "Ninth Five-Year Plan"?

The ancients used the Ninth Five-Year Plan to describe that the emperor came from the Book of Changes. The emperor should have this title as early as Qin Shihuang. Qin Shihuang unified the world, so he was called the first emperor, but the Ninth Five-Year Plan was a kind of honorific title for later generations. Because in the book of changes, Ninth Five-Year Plan, the flying dragon is in the sky, see if the adults are good? In this sentence, the Ninth Five-Year Plan represents the sun be the spirit, and the dragonfly also refers to a situation in which the sun be the spirit is extremely strong, and says? Flying dragons are in the sky, but is this a virtue? Therefore, the Ninth Five-Year Plan can be said to be the best, that is to say, the sun is the spirit and the virtue is extremely high. This kind of person is basically used to describe an emperor or a saint. So it is very appropriate to describe the emperor in the Ninth Five-Year Plan.

In addition, nine is the largest number in the eyes of the ancients and represents the concept of infinity. For example, nine days, the sky is infinitely high, and the infinite area outside the capital city is also called Jiufu, and the minister around the emperor is called Jiuqing. It can be seen that the nine blessings are a conceptual, numerous and great meaning. The respect of the Ninth Five-Year Plan means that the emperor's dignity is infinite and indescribable.

Then nine is still the pole of yang, which means the sun is the most prosperous, but the ancients still pay attention to the golden mean and harmony, so they will use a number five. Five is in the middle of one to nine, which is just in line with the golden mean. Moreover, the first five hexagrams in the branch divination refer to the dragon in nine to nine days. In the eyes of the ancients, the dragon itself is a kind of god beast, and the emperor is also called the real dragon emperor. The emperor is like a representative of the dragon on the earth, so using the Ninth Five-Year Plan to describe the emperor is like saying that the emperor is a dragon in the sky, just like a dragon. As noble as a dragon.

Therefore, using the statue of the Ninth Five-Year Plan to describe the emperor, first of all, is the meaning of numbers, that is, the Ninth Five-Year Plan represents infinity, which conforms to the golden mean. Then in the Book of Changes, the Ninth Five-Year Plan also represents Gao De Levin, so it is appropriate to describe the emperor.