The saying that "the mountains in the south are sunny in the north and the mountains in the north are cloudy in the south" mainly originated from the Central Plains, that is, the Yellow River Basin. In the ancient Yin-Yang geomantic omen in China, dryness was called "Yang" and dampness was called "Yin", that is, the place that can be irradiated by the sun was called "Yang" and the place that cannot be irradiated by the sun was called "Yin".
Because geographically, the Yellow River basin is located in the north of the Tropic of Cancer, and the sun is in the south all the year round. In the east-west mountain range, the south of the mountain can be illuminated by the sun, which is called sunny slope, while the north of the mountain can't receive sunlight all the year round, which is relatively humid, so it becomes shady slope.
However, the branches and sections of the east-west rivers or rivers in China are located in the northern hemisphere, because under the influence of geostrophic deviation, the right bank is eroded and the left bank is piled up, that is, the south bank is eroded and the north bank is piled up. Therefore, the south bank is lower and wetter than the north bank, so it is difficult for sunlight to reach, and if there are peaks on the south bank, it will also block the sunlight that originally hit the south bank, so it is called shade. The north bank of the river can be illuminated by sunlight, so it is called Yang.
Take the Qinling Mountains as an example. The southern foot of Qinling Mountain is sunny all the year round, but there is no sunshine in the north. Therefore, the southern foot of Qinling Mountain is called Yang and the northern foot is called Yin. Take Huaishui as an example. The south bank of Huaishui is cloudy and the north bank is sunny. And the name of "Huaiyin City" came from this.
This concept of Yin and Yang has had a long-standing influence in China, and it has also become the basis for naming many place names in China. We all know Xianyang, but why is it called Xianyang? "salty" means "all" in ancient Chinese, and Xianyang means all yang. Xianyang is located in the north of Weihe River and in the south of Shaanxi. The mountains and rivers are all sunny, so it is called Xianyang. Huayin County is famous for its old Huayin accent. Huayin County is located in the north of Huashan Mountain, so it is called Huayin. According to this principle, we can also infer the local geographical environment from these place names.
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Why is Shannan Shuibei called Yang?
Many people are familiar with the word "Yu Gong Yi Shan". There is a sentence in the article "refers to the south of Henan, reaching Hanyin". The following interpretation of the text is: the south of the mountain is called Yang, and the north of the mountain is called Yin. So what exactly does this explanation mean? What's the point? This article will briefly share:
Why is the sun in the south of the mountain and behind the water? This is related to our traditional geographical concept. The ancients in China believed that the mountains and rivers in China originated from Kunlun. In the book "Geography as a Son", Kunlun Mountain is called the ancestor dragon, and all other mountains are descendants of the dragon of Kunlun Mountain. The small mountain range is called Zhilong, and there are three dry dragons in China, that is, three mountains originating from Kunlun Mountain. Although the three mountains are in different directions, they can all be regarded as east-west directions. The sun rises in the east, moves slowly south, and then sets in the west. The sun first shines on the south side of the mountain. The positive side is naturally called the positive side.
Where there are mountains, there is water. The water veins originating in Kunlun mainly include the Yellow River, the Yangtze River and the Yalu River. Due to the anger of the workers, the pillars supporting the sky are broken, and the support of the southeast dimension is also broken. The topography of China is generally high in the northwest and low in the southeast. Man struggles upwards, but water flows downwards. The rivers of these three big rivers can basically be regarded as flowing eastward into the sea. Zhu said in "Geography of the Son of Man": There are three major waters in the world, called the Yellow River; Yue Changjiang; It's called Yalu River. Today, according to the map, the Yangtze River and the South China Sea are in the East China Sea and the South China Sea. The Yellow River and the Yangtze River are sandwiched between the East China Sea; The Yellow River and Yalu River meet in the northern part of Liaohai.
For the Yangtze River, it is sunny to the south of Nanganlong, and the Yangtze River is located to the north of Nanganlong, so when the sun shines, it is sunny in the north; As far as the Yellow River is concerned, it is located in the north of Zhongganlong, where the sun shines and the north is sunny. For the Yalu River, it is located in the north of Beiganlong and also on the sunny side. So the three most representative water systems all face north.
Therefore, the most representative mountains and water veins are the south of the mountain and the north of the water, which is called Yang. With this knowledge, many place names in China are easy to understand. For example, Hanyang in Wuhan refers to the north of Hanshui River. Jiangyin in Jiangsu refers to the south of the Yangtze River. There are many similar examples, so I won't list them one by one.
Why is the mountain south and the water north? Is it cloudy in the north and south of the mountain?
The earth rotates.
The mountain is a towering part of the ground, and the light energy of the sun rising in the east and setting in the west can reach the south of the mountain, but not the north, so the south of the mountain is sunny and the north of the mountain is cloudy;
The topography of China is high in the northwest and low in the southeast. Rivers often flow to the southeast, and the south bank of the river is vulnerable to the impact and erosion of the river, forming a situation that the south is wet and the north is dry, so the water in the north is sunny and the water in the south is cloudy.
Many place names in China are also related to this, such as Jiangyin, Huaiyin, Hanyang, Hanyin, Huayang and Huayin.
Geographical knowledge is related to the rotation of the earth.
Extended data:
The relevance of the earth's rotation: the deflection of objects moving horizontally along the surface.
The rotation of the earth will also cause objects moving horizontally in any direction on the earth to deviate from the original direction. Based on the moving direction of the moving object, the horizontal object in the northern hemisphere leans to the right and the southern hemisphere leans to the left.
The reason why horizontal objects deflect on the surface is that all objects have inertia and try to keep their own speed and direction. As mentioned above, the horizontal direction on the earth is based on latitude and longitude, the longitudinal direction is the north-south direction and the latitude direction is the east-west direction.
However, due to the rotation of the earth, the latitude and longitude, as the standard of north-south and east-west directions, deviated with the autobiography of the earth. Therefore, the horizontal motion of objects that really keep the same direction, if represented by the direction on the earth, is relatively deflected.
Baidu Encyclopedia-Earth Rotation
Baidu encyclopedia-landscape yin and yang
Why is the mountain south and the water north?
It is sunny in the south and cloudy in the north, because the two places are affected by solar radiation differently. The water in the south is cloudy and the water in the north is clear. Because of the influence of the earth's rotation deviation, the south bank of the river is wetter than the north bank.
Because most of China is located in the north of the Tropic of Cancer, the direct point of the sun is always located in the south of the Tropic of Cancer. The sun mainly shines from south to north, and the south slope is sunny. The south can get more solar radiation and heat. Therefore, the south of the mountain is yang and the north of the mountain is yin.
At the same time, due to the influence of the earth's rotation deviation, rivers will shift to the right bank when flowing, while most rivers in China are east-west, and the south bank of rivers is vulnerable to the impact and erosion of rivers, resulting in a situation of wet south and dry north. So the water in the north is yang and the water in the south is yin.
Extended data
Application of Shannan as Yang
In ancient times, the mountains in the south were sunny in the north, and the mountains in the north were cloudy in the south. At the same time, many place names in China are also related to this, such as Jiangyin, Huaiyin, Hanyang, Hanyin, Huayang and Huayin.
At the same time, many buildings in our country also adopt the principle that Shannan is the sun. As early as the primitive society, China ancestors built village houses facing south. In the Shang and Zhou Dynasties, the direction of survey was the first step in selecting the environment.
In ancient times, the south was regarded as supreme, while the north symbolized failure and submission. The palaces and temples face south, and the emperor's seat faces south. When he became an emperor, he called it "south is the respect"; Defeat, surrender to others, "defeat" and "surrender to the north."