Is Zhouyi related to pi? Zhouyi Zhou perimeter variable

According to Mr. Needham, ancient Egypt once got a pi of 3. 1604 and ancient Babylon got a pi of 3. 125, but the common practice of ancient civilization was to take pi as 3. The same was true in ancient China, at least in the Western Han Dynasty, when we were still talking about Wednesdays and Mondays.

Parallel to Path One on Wednesday, China also has the concept of a circular place. Although the Book of Rites said that Ceng Zi, a disciple of Confucius, was opposed to this concept, even if he said that, the sky could not be covered. But until the end of feudal society, this concept still deeply influenced people's thoughts and the political life of the country. We can still see that the Tiantan in Beijing is round, and so is the Hall of Prayer for the New Year next to the Temple of Heaven, although it is very difficult to build such a round house. The altar is square, so is the social altar in Beijing Zhongshan Park, because it is also a symbol of the earth. When people play the game of giving everything a number, three nature is the most suitable number for heaven.

"Zhouyi Shuo Gua Zhuan" says, "Go to heaven and earth and count". Ginseng three. This sentence can be understood as three for odd numbers and two for even numbers. However, it can also be directly understood as three days. For example, Yu Fan mentioned earlier said that participation is three. On some special occasions, such as pi, people will naturally connect heaven, circle and three together immediately.

One of the important functions of the state is to issue unified standards of weights and measures, which is still the case today. Qin Shihuang unified China; One of the great achievements is unified measurement. Today, we are going to visit the Forbidden City. There is a standard measuring instrument in front of the Hall of Supreme Harmony as a symbol of power. At the end of the Han Dynasty, Wang Mang proclaimed himself emperor on behalf of Han Dynasty, and Liu Xin also made such measuring tools for Wang Mang. This measuring instrument is now kept in the Palace Museum in Taiwan Province Province. It has a cylinder at the top and an inverted square barrel at the bottom. The cylinder is called Hu, and there are three gadgets on each side of Hu, which are called Sheng, He and Hu respectively. There is an inscription on it explaining the volume of the measuring device. The inscription reads: the inner wall of the cylinder can accommodate a square with a side length of one foot, and the angle of the square is still 9.5 mm from the inner wall of the cylinder. The bottom area is 162 square inch, the height is one foot, the volume is 1620 cubic inch, and there are ten buckets.

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There are many, I don't understand.

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In the second part.