The coordination of Yin and Yang in heavenly stems and earthly branches is very simple, that is, odd numbers are positive and even numbers are negative, that is, heavenly stems are positive for A, C, E, G and nonyl, negative numbers are B, D, G, Xin and Gui, earthly branches are positive for Zi, Yin, Chen, noon, Shen and Xu, and negative numbers are ugly, Mao, Si, Wei and unitary.
Heavenly stems and earthly branches's cooperation with the Five Elements is slightly complicated. In Tiangan, A and B belong to wood, C and D belong to fire, E and E belong to soil, G and Xin belong to gold, and Ren and Gui belong to water. In the earthly branches, Yin, Mao and Chen belong to wood, Si, Wu and Chen belong to fire, Shen, You and Xu belong to gold, Hai, Zi and Ugly belong to water, Chen, Xu and Ugly belong to earth.
Ten-day stems: A (ji ǐ), B (yǐ), C (bǐng), D(Dǐng), E (w ǐ), J (jǐ), G (G ǜ ng), Xin (xǐn).
Twelve earthly branches: Zi (zǐ), chou (Chou), Yin (yín), Mao (m ǐ o), Chen (chén), Si (s), Wu (), Wei (wèi) and Shen (shēn).
(Note: The twelve earthly branches correspond to the zodiac-son: mouse; Ugly: cattle; Yin: tiger; Thumb: rabbit; Chen: Dragon; Rudder: snake; Afternoon: horse; No: sheep; Shen: Monkey; Hey: chicken; Hey: dog; H: pigs. )。 Ten branches and twelve branches are matched in turn to form sixty basic units. The ancients used this as the serial number of year, month, day and time, which is called "the discipline of branches and branches".
As early as 2697 BC, when Huangdi, the ancestor of China, established the People's Republic of China (PRC), he was ordered to explore the atmosphere of heaven and earth and the five elements (fire, water and earth in Jin Mu), starting from the ten days of A, B, C, D, E, G, Xin, Ren and Gui, as well as Zi, Ugly, Yin, Mao, Chen, Si, Wu. According to the records in Five Elements of Justice, the main branches and branches were created after great efforts. Big scraping "takes the five elements of love and builds it with a bucket machine." Party A and Party B use the name of the day as the basis, and the name of the month as the basis. There is something in the sky that uses the sky, and there is something in the ground that uses the moon. Yin and Yang are different, so there are branches and branches. "
In the China calendar, the time for the moon to orbit the earth once (29.5306 days) is regarded as January, and the time for the earth to orbit the sun once (365.438+09 days) is regarded as a year. In order to make the average number of days in a year consistent with the number of days in the tropical year, a leap month is set up. According to records, in the 6th century BC, China began to coordinate the lunar calendar with the solar calendar by the method of 19.
Heavenly stems and earthly branches is a symbol designed by the ancients to facilitate the 60-digit system when building calendars. For ancient China people, the existence of heavenly stems and earthly branches was as simple as Arabic numerals. Later, these symbols were applied to maps, directions and time (time axis and space axis), so these numbers were endowed with more and more meanings.
The ancients (Yellow Emperor) observed Wang Shuo's moon and found that the two moons were about 59 days. 1February is generally more than 354 days (similar to the length of a tropical year), so the ancients got the concept of 12 months in a year. In the collocation diary method (ten-day dry), the yin-yang calendar was produced and developed in heavenly stems and earthly branches; It should be more mature in Xia, Shang and Zhou Dynasties.
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It originated from the observation of astronomical phenomena in ancient times and is a kind of "river map"
The river map and Luo Shu produced by astronomical observation became valuable things for the emperors of the three dynasties. Hetu and Luoshu are simple in structure and are one of the cultural cornerstones of ancient China. Liao Ping, a scholar of Confucian classics in Qing Dynasty, made many textual researches on The Book of Songs, The Book of Changes and The Internal Classic, and confirmed that the theory of The Internal Classic originated from The Book of Changes, and the mathematical theory of The Book of Changes was taken from Heluo.
The river map consists of five elements, five elements, yin and yang, and images of heaven and earth. The schema takes white circles as yang, sky and odd numbers; Black dots are yin, earth and even numbers. And the combination of heaven and earth and five elements, and the combination of yin and yang and five elements, so the schema structure distribution is as follows:
One and six * * * live in the north, because the sky is full of water, and the ground is 60%; Two and seven are friends who live in the south, because the land is second only to inflammation, and the sky is 70%; Three and eight live in the east as friends, because the sky is full of trees and the land is 80%; Four or nine live in the west, and gold is born because of the land, and the sky is 90%; Five and ten are in the same place and live in the center, because they were born in five places and the land is 100%. The river map is drawn according to the five-star season. Five stars, called five latitudes in ancient times, are five planets in the sky. Wood is called the old star, fire is called the twinkling star, earth is called the town star, gold is called the white star and water is called the morning star. Five elements of operation, divided into 28 dormitories. Because its orbit is not far from the sun road, the ancients used it to mark the sun. The five stars generally appear in the Arctic sky in the order of wood, fire, earth, gold and water. Each star has a 72-day line, and the five stars circle 360 degrees. It can be seen that the river map is drawn by the five-star sky, which is also the source of the five elements. Because before the winter solstice of 1 1 month every year, Mercury can be seen in the north. When the winter weather comes, everything is dormant, and there are only ice, snow and water on the ground. This is how the concept of water travel was formed. After the summer solstice in July, Mars was seen in the south. It was summer weather and the ground was very hot, so the concept of fire line was formed. At the vernal equinox in March, Jupiter appeared in the east. Just as spring came, plants sprouted and grew. The so-called "spring comes to the world to know the vegetation", and this is how the concept of wooden walking is formed. In September and the autumnal equinox, Venus appears in the west. In ancient times, weapons were represented in many ways to show the season of autumn war, and everything was old and withered, which led to Jin Xing. See Saturn in May, which means that when the soil is wet in the long summer, the wood, fire and water all take this as the midpoint. The four seasons climate changes caused by wood fire and gold water are all observed from the ground, and the concept of soil travel is formed in this way.