What does the theory of separation of yin and yang in Huangdi Neijing mainly talk about?

Firstly, it expounds that although Yin and Yang in nature are infinitely changeable and separable, there is only one key point, namely, one Yin and one Yang.

2. Discussed the connection and separation of three Yin San Yang meridians, their positions, starting points and ending points.

Thirdly, it points out the functional characteristics of the three channels of Yang-opening, closing and pivoting.

The original Yellow Emperor asked: I heard that the sky is Yang, the earth is Yin, the day is Yang, the month is Yin, and the size of the month is 360 days to become one year old. People should also respond. Today's three Yin San Yang, should not be Yin and Yang, so why? Zeebe told them that Yin He was counted as many as ten, pushed as many as a hundred, pushed as many as a thousand, pushed as many as ten thousand, and ten thousand was too big to count, but they needed one.

The sky covers the earth, everything is born from the earth, and the shadow of the sun is called the shadow of the sun; Those who come out of the ground are called yang in yin. Yang is positive and yin is dominant. Therefore, birth is due to spring, growth is due to summer, harvest is due to autumn, and storage is due to winter. If it is not normal, the world will be blocked. The changes of yin and yang in people can also be counted.

The emperor said: I want to hear about the three-point yang.

Qi Bo said: The sage stands in the south, the former is called bright, the latter is called Taichong, and the place name of Taichong is called sun. The sun is rooted in Yin and ends at Ming Gate, which is called Yang in Yin. In the body, it is called Ming, under Ming, called Taiyin, and before Taiyin, it is called Yangming; The root of Yangming originated from Lidui, that is, Yang in the Yin of the Sun; The table of Jue yin is called "the sun is not as good as yang"; The root of shaoyang comes from Yinqiao, and shaoyang is nominally Yin. Therefore, Sanyang leaves Taiwan, the sun opens, Yangming smells, and Shaoyang pivots. People who have passed the three courses will never lose each other, fight without floating, and live a life of Yang.

The emperor said: I would like to smell Sanyin.

Qi Bo said: The exterior is Yang and the interior is Yin, but the interior is Yin, and rushing down is called Taiyin. Taiyin is rooted in hidden white, which is called Yin in Yin. After the lunar calendar, the name day is less cloudy, the name day is less cloudy, and the name day is less cloudy. Before Shaoyin, it was called Jueyin, which was rooted in Datun, and Yin was absolutely yang, so it was called Jueyin. Therefore, the clutch of the three yin is also the opening of Taiyin, the closing of Jueyin and the pivot of Shaoyin. People who have experienced three classics should not lose each other, fight without sinking, and have a bad name.

Yin and yang are heavy, and after a week, the forms of qi complement each other.

The Yellow Emperor asked: I heard that the sky belongs to Yang, the earth belongs to Yin, the sun belongs to Yang, and the moon belongs to Yin. Together, the big moon and the small moon take 360 days to become a year, and the human body also corresponds to this. Now, I heard that the number of three Yang in Yin San's human body is not consistent with the number of Yin and Yang in heaven and earth. What is the reason? Qi Bo replied: The range of Yin and Yang in heaven and earth is extremely wide. In practical application, it can be deduced from ten to one hundred, from one hundred to one thousand, from one thousand to ten thousand, or even countless. However, its general principle is still nothing more than the unity of opposites of Yin and Yang. Between heaven and earth, everything is born without leaving the ground, which means it lives in yin, which means it is yin in yin; If it has grown out of the ground, it is called the Yang in the Yin. Everything grows with Yang, and everything takes shape with Yin. Therefore, everything happens because of the warmth of spring, the prosperity of everything, the heat of summer, the harvest of everything, the coolness of autumn, the seclusion of everything and the cold of winter. If the four seasons are abnormal and the climate is impermanent, the growth and collection changes between heaven and earth will lose their normal state. For people, this change of yin and yang is also regular and can be inferred.

The Yellow Emperor said, I'd like to hear about Yang's clutch. Qi Bo said: The sage stands facing south, with the name of light in front and the name of Tai Chong in the back. The meridians running in Taichong are called Shaoyin. Meridian above Shaoyin Meridian is called Sun. The lower end of the temple starts from Yin Zhi point outside the little finger, and the upper end ends at Jingming point. Because the sun is less cloudy, it is called yang in yin. In terms of human body, the upper part of the body belongs to Yang, which is called light, and under the light, it is called Taiyin. The meridian before Taiyin is called Yangming, and the lower end of Yangming meridian starts from Lidui point on the big toe side. Because Yangming is the table of the Taiyin, it is called the Yang in the Yin. Jueyin is inside and Shaoyang is outside, so the surface of Jueyin meridian is Shaoyang meridian, and the lower end of Shaoyang meridian starts from Yinqiao point, so it is called Shaoyang in Yin. Therefore, the combination and separation of the Three Yang Meridians, separately speaking, means that the main surface of the sun is open, the main surface of Yangming is closed, and the shaoyang pivots between the exterior and the interior. But the three are not separated, but closely linked, so together they are called one Yang.

The Yellow Emperor said: I want to know more about Yin San's clutch. Qi Bo said: The exterior is Yang and the interior is Yin, so the internal meridians are called Yin Meridian, the front of Shaoyin Meridian is called Taiyin, and the root of Taiyin Meridian starts from the hidden white spot at the end of the big toe and is called Yin in Yin. The back of Taiyin is called Shaoyin, and the root of Shaoyin meridian starts from Yongquan point in the foot, which is called Shaoyin in the yin. The front part of Shaoyin is called Jueyin, and the root of Jueyin Meridian starts from Dadun point at the end of the big toe of the foot. Because the two yin are combined but not yang, Jue yin is located at the innermost part, so it is called the absolute yin of yin. Therefore. On-off of Sanyin Meridian, respectively, Taiyin is the exterior of Sanyin, Jueyin is the interior of main yin, and Shaoyin is the hinge between Taiyin and Jueyin. But the three are not independent, but closely related, so they are collectively called Ayin.

The qi of yin and yang keeps running, spreads to the whole body, and is transported internally to the exterior. This is the principle that yin and yang are on and off, and the exterior and interior complement each other.