The stems and branches, namely the heavenly stems and earthly branches, originated from the observation of celestial phenomena in ancient China.

"Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui" is called the ten heavenly stems, and "Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai" is called the twelve earthly branches.

The heavenly stems and earthly branches formed the ancient calendar, which was said to be the beginning of the Darao family, the teacher of Huangdi.

The ten stems and the twelve branches are matched in sequence, forming sixty basic units. The two cooperate with each other in a fixed order to form the stem and branch epoch.

The Heavenly Stems and Earthly Branches were mainly used to record the days in the ancient times, and were also used to record the months, the years, the times, etc.

In ancient times, ancient people used the heavenly stems and earthly branches as carriers. The heavenly stems carried the way of heaven, and the earthly support the way of earth.

The heaven becomes an image, the earth becomes a shape, and the human fortune is formed; the heavenly way and the earth determine the human way, so the heavenly stems and earthly branches are set to conform to the fate of heaven, earth and human affairs.

The heaven and earth are positioned, and the stems and branches are used to determine time and space, and time and space are used to determine the world.

The stems are like the sky and the branch is like the earth. Although all things grow on the earth, the prosperity and decline of all things cannot be separated from the sky. The combination of the ten heavenly stems and the twelve earthly branches forms sixty Jiazi, which is used to explain the learning of heaven, earth and man.

Ancient records say: "There is a sacred life, and the great sacred life is a sacred life." According to ancient records, there were twelve earthly branches during the Yellow Emperor period, all representing twelve different month and seasons every year; the heavenly stems and earthly branches are used in combination to record year, month, day, and time.

The stems and branches are one of the important means and ways to apply Yixue in practice, and the development laws of many things are understood through it.

"Trunk and branch" is derived from the "trunk and branch" of a tree.

The ten heavenly stems are: Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui; among them Jia, Bing, Wu, Geng, Ren are the yang stems, Yi, Ding, Ji, Xin, Gui are the yin stems.

The twelve earthly branches are:

Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai. Among them, Zi, Yin, Chen, Wu, Shen, Xu are the yang branch, Chou, Mao, Si, Wei, You, and Hai are the yin branch.

The corresponding twelve zodiac signs of the twelve earthly branches are:

Zi-rat, Chou-ow, Yin-tig, Mao-rabbit, Chen-dragon, Si-snake, Wu-horse, Wei-sheep, Shen-monkey, You-rooster, Xu-dog, Hai-pig.

The predecessors said: "The heavenly stems are just like the stems of wood, strong and become yang; the branch is just like the branches of wood, weak and become yin." It can be seen that the original meaning is called stems and branches.

Since the meaning of the Heavenly Stems and Earthly Branches comes from trees, their original meanings are also given vivid statements by people.

The stem is the stem of a tree.

A: It is like plants and trees break through the ground and sprout, and the yang is inside and is wrapped by the yin.

B: The plants and trees are born, and the branches and leaves are soft and bent.

Bing: Bing, like the sun, the flames of fire, everything is ignited, and it is bright when you see it.

Ding: The plants and trees grow strong, just like the growth of human beings.

Wu: lush, symbolizing the lush and prosperous grass and trees on the earth.

Ji: rises up, and records. All things rise up with a recession, and there is a tangible way to record.

Geng: It’s also the harvest in autumn and the spring comes.

Spicy: The taste of gold is spicy, and things become more delicious. Spicy is new, and all things change solemnly and become more beautiful.

Ren: Pregnancy, the yang energy lurks in the ground, and all things are pregnant.

Gui: It is called Kui. All things are hidden, and they are pregnant and are underground, and Kui will sprout.

A branch is like a branch of a tree.

Zi: It is the breeding, and the yang energy begins to sprout and breeds from the lower part.

Chou: It is a stern, and the cold air is bending.

Yin: It is the spirit, the flexion of the grass and trees in the cold soil stretch from the ground facing the spring sun.

Mao: It is the sun shines on the east, and all things are flourishing.

Chen: It is shaking, stretching, all things are shaking up, and the yang energy has been generated by half.

Si: Si is, the yang energy has been spread all over.

Wu: It is a coronation. All things are full and growing, and yin and yang are in shock and coronation. The yang energy is full and the yin energy begins to emerge.

Wei: It is a twilight, and the sun is in the middle of the sun, and the sun is facing a quiet place.

Shen: If you extend the bundle to form, the bodies of all things will be formed.

You: That's right, everything is ripe.

Xu: Destruction, all things are destroyed.

Hai: The core is the collection of all things, and they are all firm.

The twelve earthly branches are derived from the ten heavenly stems.

Gui pregnant with Jia, called Zi

Ji is pregnant with Geng, called Chou

B is pregnant with Ding, called Yin

Yi is pregnant with C, called Mao

Ji Pregnancy is called Chen

Ding is pregnant with Ji, called Si

Ding is pregnant and Wu, called Wu

Wu is pregnant with Geng, called Wei

Xinbao Gui, called Shen

Xin is pregnant with Ren, called You

Wu is pregnant and Xin, called Xu

Gui is pregnant with Yi, called Hai

The combination sequence is - Yang stem and Yang branch, and Yin stem and Yin branch.

The twenty-eight constellations in the lunar sky are composed of stars. The stars are very stable, and their relative positions remain unchanged for tens of thousands of years or even longer. The impact on the earth is also relatively stable. The planets in the Earth and other solar systems constantly revolve around the sun, while the entire solar system is spiraling in the Milky Way relative to the Polaris. This forms a change in the positional relationship between the stars due to the movement of the sun, the moon and the five stars, which in turn changes the impact of specific constellations on the earth and everything on the earth. Therefore, the ancients predicted good and bad luck by observing the celestial phenomena at night, and the Seven Politics and Four Yu and Ziwei Doushu are the ancient star destiny theory extended.

The star constellation at night is restricted by many unfavorable factors such as time, position, and climate, so people try to find a simpler way to divine, and the earthly branches are used in this case.

The division of the moon is based on a cycle of round and ignition of the moon, and is divided into large and large moons, thirty days of the big moon, twenty-nine days of the small moon, twelve months of a year, and leap months are added to make up for its shortcomings. Therefore, the plane of the ecliptic is divided into the twelve palaces in astronomy, and the sun and the passing palaces are divided into twelve months. Therefore, in ancient times, the zodiac twelve palaces were named after the earthly branches, and the twelve palaces were corresponding to the twenty-eight constellations, that is, the uterus has three constellations, the ugs have three constellations; the ugs have two constellations; the yin palace has tails, and the ji

Two constellations; there are Di, Fang and Xin in the Mao Palace; there are Jiao and Kang in the Chen Palace; there are Yi and Zhen in the Si Palace; there are Liu, Xing and Zhang in the Wu Palace; there are Jing and Gui in the Wei Palace; there are Jue and Shen in the Shen Palace; there are Wu Palace; there are Wu Palace, and Shen in the You Palace; there are Wu Gai, Mao and Bi in the Xu Palace; there are Kui and Lou in the Xu Palace; there are room and wall in the Hai Palace. Therefore, the astronomical meaning of the twenty-eight constellations is the source of the symbolic meaning of the earthly branches in the stem and branch studies, and the twenty-eight constellations are hidden in the twelve earthly branches, and its meaning also comes from this.

Because the stems and branches are used to count the time, if the plane of the zodiac twelve palaces is imagined as the dial of the clock, with the earth as the center of the dial, the twelve palaces are the scale indicators of the dial, and the five stars of the sun and the moon are equivalent to seven pointers, which run on the large dial of the zodiac twelve palaces, forming a huge clock. Among them, the sun is the "year" pointer, and the earth moves around the sun for one week and returns to the origin is one year; the moon is the "moon" pointer, and the moon moves around the earth for one week and returns to the origin is one month; the twenty-four solar terms are directly related to the sun passing through the palace, but have no direct relationship with the movement of the moon, which causes the time difference between the moon and the solar terms in the calendar. Therefore, the monthly orders learned by the stems and branches are determined according to the solar terms, that is, they are consistent with the Sun passing through the palace.

The two slowest pointers, that is, the cycle of the intersection of Jupiter and Saturn, the two most important planets in the solar system, need twenty years, that is, one fortune; if two stars want to meet in the same house, it will take sixty years, that is, one yuan.

Similarly, the period when the five stars of the sun and the moon overlap in the same house requires about 180 years, that is, a positive element; if the positions of the five stars of the sun and the moon overlap, and change from a house with an angle of 30 degrees to a constellation of a constellation at a angle of 12.8 degrees, it takes about 540 years to overlap once, that is, a great element. Because the twelve palaces are the twelve earthly branches, they represent the twelve directions in space; the dial of the clock represents the energy field of the universe, that is, the aura of the relatively static heaven and earth; the movement of the five stars of the sun and the moon stirs up the originally relatively static energy field, and the distribution of the five stars of the sun and the moon in the twelve palaces represents the influence of each star on each palace in the current time, that is, the distribution state of the energy of the celestial body in the current time space, and its expression is Jiazi, Yichou, Bingyin, Dingmao, etc.

The earth's rotation period is one day, that is, twelve hours. During the earth's rotation, the influence of the sun and the moon on the same place on the earth is changing at all times. The same place on the earth moves for a week relative to the sun and the moon. The earth's revolution angle moves forward for about one degree in one day, that is, the spatial position of the sun and the moon and the five stars changes to one degree, and it repeats itself day after day.

Therefore, the energy distribution of celestial bodies at the same place on the earth changes at one degree a day, that is, the energy distribution of the same place changes day by day, which is the Jiazi, Yichou, Bingyin, Dingmao, etc. of the sun and hour.

There are twelve earthly branches, and there are only ten heavenly stems. Why is this?

First of all, the clock model just now is based on the geocentric theory, but in fact, the Earth and the other five stars are revolving around the sun. Due to the different orbits and speeds of operation, the relative positions of planets are approaching and away from each other, which is the "planet retrograde" in astronomical form. Retrograde has a special position in astrology. Traditional astrologers believe that retrograde allows planets to exert a weak influence.

However, under the guidance of the Yin-Yang theory in ancient China, the energy represented by the five stars is divided into Yin and Yang according to the two forms of the position of the five stars close to and away from the earth, and then the ten heavenly stems of the five stars affecting the earth are sorted in sequence: Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, and Gui.

The heavenly stems and the earthly branches are matched, and two more earthly branches do not match the heavenly stems, forming Xinkong, which is also called Kongdea.

This is because the sun, moon, five stars and the earth are constantly rotating and revolving, stirring the energy field of the zodiac twelve palaces, which is relatively stationary, which causes uneven energy distribution around the earth. This is equivalent to the vortex formed by the river water in the river downstream of the stones and the place behind the stones. The position of this vortex is empty.

As time goes by, the positions of the sun, moon and five stars have changed, and the position of the vortex also changes. The original vortex disappears, and the adjacent places become vortexes, which repeat and cycle for one week, thus creating a reciprocating cycle of sixty Jiazi.

The stems and branches develop to the calendar, the month, and the hour, forming the stems and branches calendar.

In addition to recording time and divination, the stems and branches were later given more and more functions.

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