Divination has two streams, one is "Yi", which is based on gossip as the basic symbol, which originates from tortoiseshell animal bone divination; The other is the "Shushu" with the heavenly stems and earthly branches as the basic symbol, which originates from ancient Chinese astronomy.

Bu and Xiao are the two earliest mathematical activities in Chinese history.

In the Fuxi era, there may have been the act of divination. More precisely, it may just be an act of psychological suggestion, an act of mental decision-making, decision-making, the mental act of choosing one or more of the two as a result. This act of choice is still being used every day and all the time, to make a choice between two or more.

The earliest information on divination in history is the oracle bone engraved with divination or divination symbols in the Shang and Zhou dynasties. At that time, before people decided on important matters, they had to use fire to burn tortoise shells or ox shoulder blades, and guess the good luck and evil of personnel based on the cracks that were burned. In ancient times, there were divination officials, and they were very good officials.

"Dictionaries" cloud: "The number of Dayan is fifty, and its use is forty and nine; Divided into two, like two, hanging one like three, with four, with four times, attributed to the strange, to the like leap, five years old and then leap, so then hang", this is the yarrow divination.

With 50 yarrows, use your hands to score casually, see if it is odd or even, three times in a row for the result. No matter how many times you divide it, there are only eight possible results in the end. Some people think that this is the origin of gossip!

The lunar calendar has 354 days in a year and 365 days in a solar year, a difference of 11 days, so a leap month needs to be added every three years, and two leap months need to be added in five years. Therefore, a leap month needs to be added to the above four years (lunar calendar). After four years (lunar calendar), an additional leap month is added to the fifth year. In this way, there are a total of 50 months, and these 50 months are the origin of "the number of the Great Yan is fifty, and its use is nine out of forty".

The "Great Yan Zheng Method" is based on the number in the river chart. Heaven and earth are two, heaven three earth is four, heaven five earth is six, heaven seven earth is eight, heaven nine and earth is ten, and the numbers in the five units of heaven and earth are added together, and there are a total of fifty-five numbers, and the whole number is fifty and used to occupy it.

The tool used to occupy the Da Yan Zheng is a perennial yarrow. Legend has it that yarrow is a rare plant, and there are only three places in the country that grow this grass: one is Qufu, Shandong; One is Shanxi Jin Ancestral Hall; Then there is Taihao Fuxi Mausoleum. Yarrow is a perennial herbaceous plant that grows only one stem every year, and only after a hundred years will it grow in clusters before it can be used as a strategy. It is said that only those who have deep experience and talent can use it effectively.

The "Great Yan Zheng Law" takes the integer number of the number of heaven and earth and uses it to occupy it, that is, fifty! The number of heaven and earth is five out of fifty. In terms of rhetoric, it is said that "the number of Dayan is fifty, and its use is nine out of forty". First of all! Take one out and set it aside, symbolizing Tai Chi.

The remaining forty-nine branches are divided into two parts, symbolizing the two rituals. One side symbolizes the heavens and the other symbolizes the earth. Take one from one side of the earth and put it near the sky, symbolizing man! Symbolize the three talents of heaven, earth and man!

And then! Start on one side of the day and divide by four. Four symbolizes the four seasons, so divide by four! If the remaining number is four, it will be placed on this side of the heavens, symbolizing a leap year or leap month!

And then! Start on one side of the earth and divide by four as well. If the remaining number is four, it will be placed on this side of the earth, symbolizing a leap year or leap month!

After such calculations, the result will be as follows: if there is more than one number of days, then! There are only three remaining in the number of lands; If there are two days left, then! There are only two remaining in the number of lands; If there are three days left, then! There is only one left in the number of lands; If there are four days left, then! There are only four places left. The remainder of heaven and earth add up to either four or eight! Plus the one that is put aside to symbolize people, it is five or nine. Such! The numbers one, two, three, four, five, six, seven, eight, and nine all appeared!

The remainder symbolizes leap. The remainder of one hand indicates a leap month, and the remainder of both hands together symbolizes another leap year, or leap year.

The formation of a line needs to go through four steps to form. 1. Divide into two instruments; Second, hang one, determine the important position of man in heaven, earth and man. Three, divide by four; Fourth, Guiqi. These four steps are also called the "Four Battalions". This is just a one-time change. One is determined through three changes. There are a total of six hexagrams, so it takes eighteen changes to form a hexagram.

The first line in the "Great Yan Zheng Law" can only be determined through three changes. The second and third times are the same, and on the basis of the first time, the remainder of the first time is no longer used, that is, the odd or even number that was left just now. Instead, just use integers! That is, the most numerous. Put them together and go through four more steps to form. 1. Divide into two instruments; Second, hang one, determine the important position of man in heaven, earth and man. Three, divide by four; Fourth, the four steps of returning. The second and third times are the same, and the remainder is added to the number of "hanging one", that is, the number representing "people", and the result is generally like this: not eight but four!

After three calculations, the first line can be determined. After three calculations, the results of the general result are as follows: nine and eight, five and four. Nine and eight count as large numbers, and four and five count as decimal places. If the result of three times is two large numbers and one decimal number, then! It's Shaoyang. Record with a penistro. If it's two decimal places and one big number, then! There is less yin. Record it with a yin. If the three are large numbers, it is Lao Yang, and it is recorded with Yang Yao. If the three are decimals, then the old yin is recorded with the yin.

There are a total of six hexagrams, so it takes eighteen changes to form a hexagram.

The explanation of the Qiangua and Kun hexagrams, as well as the sixty-four hexagrams, in the "Dayan Zheng Law".

The Qiangua is composed of six yang hexagrams, and the number represented by the yang yao is nine. Six times nine equals 54 numbers. Each line is calculated by the "Great Yan Zheng Method", which is obtained by dividing by four. So! 54 multiplied by 4 is 216.

In other words, the six lines of the Qiangua are selected from 216 numbers. The kun hexagram is made up of six yin hexagrams, and the number represented by the yin hexagram is six. Six times six equals 36 numbers. Each line is calculated by the "Great Yan Zheng Method", which is obtained by dividing by four.

So! 36 multiplied by 4 equals 144. In other words, the six lines of the kun hexagram are selected from 144 numbers. There are 360 numbers in the Qiangua and Kun hexagrams, which represent exactly 360 days in a year.

"Yi" is divided into the first part and the second part. There are 30 hexagrams in the first part and 34 hexagrams in the second part, for a total of 64 hexagrams. There are a total of 384 hexagrams in the 64 hexagrams. 64 times 6 equals 384. In the first and second chapters, the number of yang and yin lines each accounts for half, that is, 192. The number represented by the yang line is nine, and each line is obtained by dividing it by four.

So! 192 multiplied by 9 and then multiplied by 4 equals 6912 numbers; The number represented by the yin line is six, and each line is obtained by dividing it by four. So! 192 multiplied by 6 and then multiplied by 4 equals 4608 numbers; The 6,912 numbers of the yang line plus the 4,608 numbers of the yin line are a total of 11,520 numbers, which is equivalent to the number of all things.

(End of chapter)