The ancients advocated odd numbers. Why do they say people?

Modern people generally like even numbers, such as yes-men, four happiness, Liu Liu Dashun, and eight treasures, but the ancients have a special liking for odd numbers, and the emperor is called the ninth five-year plan supreme; Public office three, honest official nine; Wushu has a big dipper sword array; The height of the Temple of Heaven in Beijing, the number of stones on the altar and the number of fences are all positive numbers of one, three, five and seven. ...

The ancients divided everything in heaven and earth into Yin and Yang, with Yin representing darkness and Yang representing light and vitality.

Numbers are also divided into yin and yang. Odd numbers represent yang and even numbers represent yin. So 1, 3, 5, 7, 9 all stand for Yang. For example, on September 9, the sun and the moon meet on September 9, and the second sun is heavy, so it is called the Double Ninth Festival. There is a cloudy year, a cloudy January and a cloudy day. Moreover, in the single digits, 1, 3, 5 and 7 are all prime numbers, which can only be divided by themselves and cannot be decomposed again. In the eyes of the ancients, they had mysterious power. From the order of numbers, 1 is the origin of numbers and the lowest molecule of all numbers, such as "all things are metaphysical, and nine and nine are one"; And 3 stands for many things, such as "A threesome must have a teacher" in The Analects of Confucius, "The Tao gives birth to one, two, two, three and all things three"; 5 is the middle of the number, which accords with the viewpoint of median, so the emperor is called the ninth five-year plan supreme; 9 stands for the largest and highest degree in the singular, and also has special meanings, such as the homophonic "long", which stands for long; And because in our country, people regard nine as "heaven", because nine is a dragon-shaped or snake-shaped totem character. Therefore, in order to show that their sacred power was given by God, ancient emperors tried their best to associate themselves with Nine. Finally, the number 7, the most useful combination of stars known by ancient people is the Big Dipper, so it is of great significance to astrology, calendar and religion, such as Nu Wa's seventh birthday. This causes the special status of odd numbers.

In addition, odd numbers often exist in ancient grades. For example, the Book of Rites stipulates that "the emperor hall is nine feet, the princes are seven feet, the doctors are five feet, and the scholars are three feet"; In the Tang Dynasty, the "Camp Maintenance Order" stipulated: "Those who have more than three products in one hall can barely span five rooms and nine shelves, and one hall and one mansion can't span three rooms and five shelves; The fourth and fifth halls are reluctant to have five rooms and seven racks, and the gatehouse is not allowed to have three rooms and two; For halls below Grade 6 or 7, we can't bear to have three rooms and five frames, and there can't be one or two gatehouses. " It can be seen that there is a strict distinction between the number of "houses" and "racks" that officials at different levels can own.