The Tai Chi Yin and Yang Diagram was originally called the "Heaven and Earth Nature Diagram", so it should be a theoretical model of the structure and movement principle of heaven and earth in nature.

According to the basic law of the unity of the opposites of yin and yang in Taiji, the sun is the sky and the earth is the earth, that is, the sun and the earth should have the two basic characteristics of the Taiji yin and yang diagram, "yin and yang mutual root" and "yin and yang interchange": the interior of the sun can be mainly divided into three layers: the core area, the radiation area and the convection area. Although the core of the Sun is small, with a radius of only a quarter of the Sun's radius, it is the true source of the Sun's enormous energy.

The temperature of the sun's core, which is 15 million degrees Celsius, and the pressure is so high that the thermonuclear reaction from hydrogen fusion to helium takes place, which releases enormous amounts of energy.

This energy is then transmitted through the radiosphere and troposphere to the bottom of the sun's photosphere, through which it radiates outward into the sun's atmosphere.

In other words, the core of the sun is undoubtedly the material basis of the sun's enormous energy, and the sun would not have released enormous energy without this thermonuclear reaction from hydrogen fusion to helium, that is, without this conversion of the material base.

The core area of the sun is the material base of yin, and the radiation area, convection area and atmosphere of the sun are the embodiment of its function, which belongs to yang.

Everything has its structure and function, the body yin uses yang, the body is inside, and the outside is used, these two are an organic whole, and the sun is no exception.

Yin and yang are relative, although the temperature of the surface of the sun is 6,000 degrees Celsius, and the temperature of its core area is higher, but from the perspective of matter and function, the thermonuclear reaction produced in the core area of the sun provides a material basis for the brilliance of the surface of the sun.

In terms of the virtual and the real, the virtual is the yang, the real is the yin, the periphery of the sun is the virtual is the yang, and the pressure in the core area of the sun is extremely strong and the real is the yin.

Furthermore, the surface of the sun is full of radiance and belongs to yang, while the inside of the sun is opaque, and its core is not visible and belongs to yin.

Therefore, in the relative sense of yin and yang, this is the structural pattern of "yin in yang", which is the so-called "yang in nature, but yin in yang".

Its core area is also very similar to the structural feature of the Tai Chi Yin-Yang diagram of "Yang and Yin", that is, the fisheye. Obviously, this must be the yin inside the sun, and the external yin will not make it infinite.

There is yin in the yang to be infinitely biochemical, otherwise it is a fire without roots!

The earth is also divided into three main layers: the crust, the mantle, and the core.

The hottest place on Earth is the center of the earth, where the temperature reaches up to 6,000 degrees Celsius and is in a molten state.

Water covers 71 percent of the Earth's area, and if the land was flattened and filled into the sea, the entire Earth would be surrounded by a hydrosphere about 3,000 meters deep.

People actually inhabit a planet with the wrong name – water polo. In addition to surface water, the atmosphere is also full of water, and the water contained in the atmosphere five kilometers above the ground accounts for 90 percent of the water in the entire atmosphere, and only one in 100,000 of the total water volume of the earth, which plays a huge role in the life and reproduction of living things.

Without the constant cycle between atmospheric water and surface water, it would be difficult for organisms to survive. Therefore, water is the foundation of the earth.

Although the earth is composed of five substances: wood, fire, earth, gold, and water, "all things are not water-infertile", so water is the root of the earth's yin.

Water is yin, fire is yang, cold is yin, heat is yang. Relatively speaking, the surface of the earth is water, its nature is cold, and the inside is fire, and its sex is hot, which is the structural pattern of "yin in yin", which is the so-called "earth is yin, but yin is yang".

The center of the earth is also very similar to the structural feature of the Tai Chi yin-yang diagram "yin and yang", that is, the fisheye.

Obviously, this must be the inner yang of the earth, and the external yang will not make its spring inexhaustible.

Only when there is yang in yin can the spring be inexhaustible! Otherwise, it will be a pool of stagnant water.

Heaven and earth, "the power of creation, all in fire and water".

"He who is the living of all things is only this day."

"All things are shaped, not water is sterile".

The sun is the sun, which is the "yang of the yang", and the fire of the true yang, and the water is the yin, which is the "yin of the yin", which is the water of the true yin, that is, the true fire of the sun and the up-and-down movement of the true water of the sun are related to the creation of all things, so they should be the root of the yin and yang of heaven and earth.

"Only there is yin in the yang, so the weather can fall", this "yin in the yang" must be the yin of the earth from the outside; "there is yang in the yin, so the earth qi can rise", this "yang in the yin" must be the yang of the sky from the outside, which is the principle of movement of yin and yang that "the rise and fall of qi, and the use of heaven and earth".

Only the upward and downward movement of mutual use (mutual attraction) can make the two opposing sides link into an organic whole, so that heaven and earth are one, so that "water can rise and fire can fall, one rises and one falls, there is no end, so business exists".

On the whole, the yin in the yang of the sun and the yang in the yin of the earth are the structural patterns of the yin and yang of the Taiji Yin and Yang diagram, while the yang energy of the sun and fire descends to the earth, and the yin energy of the earth water rises to the sky, which is the movement mode of the yin and yang of the Taiji Yin and Yang diagram.

The former is structure and body, and the latter is function and use, which is in line with the two aspects of structure and function of any thing.

If it is discussed in terms of fire and water, then this is the evidence that the fire is bright on the outside and dark on the inside, and the water is dark on the outside and clear on the inside.

The sun "has yin in yang" and the earth "has yang in yin" conforms to the structural pattern of yin and yang mutual roots in the taiji yin-yang diagram, which is equivalent to the fish head and fish eyes of the taiji yin-yang fish.

The movement of the yang energy of the sun and fire and the yin energy of the earth's water rises and falls to create all things, which conforms to the movement mode of yin and yang of the Taiji Yin and Yang diagram, which is equivalent to the body and tail of the Taiji Yin and Yang fish (less yang and less yin).

Therefore, the unity of yin and yang opposites between the sun and the earth may be the true source of the yin and yang diagram of Tai Chi.

Therefore, the Taiji Yin and Yang diagram was originally called "the natural diagram of heaven and earth".

"In the sky is the air, in the earth is formed", in the sky for the wind, heat, dampness, dryness and cold, in the ground for the wood, fire, earth, gold and water five shapes, the shape and gas are sensed and all things are born.

Since the yin and yang opposites of the sun and the earth are the yin and yang relationship between heaven and earth, they should have a relationship between form and qi.

Why are the five atmospheres of wind, heat, humidity, dryness, and cold, which belong to the category of changes in the earth's atmosphere? Because from the perspective of the earth, the changes in the four seasons mainly depend on the results of the relative changes in the radiation of the light and heat energy of the solar fire on the earth's surface caused by the apparent movement of the sun relative to the earth, that is, the four seasons of spring, summer, autumn and winter are produced due to the changes in the intensity of the solar fire.

The promotion of the four seasons (five seasons) causes the earth's atmosphere to produce changes in the five qi of wind, heat, humidity, dryness and cold, so the five qi are called heavens.

Qi is yang, and fire is the root of yang, so sun fire is the root of the five qi (Tianyang).

Only the normal change of the strength of the sunfire can push each other at four o'clock and the five qi can be smooth.

The sky is qi, the earth is shape, the air is yang, and the form is yin. Although the sky is composed of five qi: wind, heat, dampness, dryness, and cold, the sun and fire are the foundation of the five qi.

Although the earth is composed of five substances: wood, fire, earth, gold, and water, water is the root of the earth's yin.

The earth fire is only the fire in the yin, and the fire in the yin is the "less yang" and not the sun.

Otherwise, "the water is cold, so that there is no fire in the water, then the cold must be extreme, and the cold pole will die out of the sun, and all things will be extinguished."

If there is no fire and earth, the water will be cold and unable to give birth to all things, which is the internal cause.

The sun and fire and the yin water are the foundation of the heavens, so the rise and fall of yin and yang (heaven and earth) is essentially the rise and fall of water and fire, and the sense of shape and qi (heaven and earth) is essentially the combination of water and fire.

Therefore, the "power of creation" of heaven and earth is all in water and fire, and only the yang energy of the sun and fire and the yin energy of the yin water rise and fall.

If the yang energy cannot fall, the yin energy cannot rise, and the yin and yang energy cannot be used for each other, there will be no unity of heaven and earth, and there will be no incarnation of all things, which is an external cause.

Only when yin and yang are mutually rooted and mutually used, and internal and external factors work together, will there be the transformation of all things.

The human body also has a Tai Chi Yin and Yang diagram.

As the saying goes: "the human body is a small world", "people are a small world", "humanity is the way of heaven".

That is to say, the human body should also be the unity of opposites of heaven and earth, and should have the structural mode of "yin and yang mutual root" and the movement mode of "yin and yang mutual use" of Tai Chi yin and yang. This is also the "Heaven and Man correspond" and "Those who speak well to Heaven will be fulfilled by others." ”