Zhenguan Civil Servant

When it comes to Chinese astronomy, many people will think of the "round sky and square earth" and think that the ancient Chinese cosmology is a romantic fantasy and has no science at all. But when you understand the "history of astronomy" in ancient my country, you will find that the "cosmology" of the ancients coincides with modern astronomy, surpassing people's cognition. Zhang Heng, a scientist in the Eastern Han Dynasty, wrote the book "Lingxian" after many years of observation. The "cosmology" described in the book is beyond the imagination of the ancients, but it is the same as the results of today's astronomical observations. The moonlight is born from what the sun shines on; the soul is born from what the sun covers. When the day comes, the light will be abundant; when the day comes, the light will be exhausted. The general idea is that the moon's light comes from the sun's irradiation, and the shadows on the moon are caused by the sun's lack of irradiation. If the sun is facing forward, the moon will be full; if the sun is facing away, the moon will be waning. In other words, the moon movement theory proposed in "Lingxian" appeared in the Eastern Han Dynasty at the latest. Some people may think that there were no astronomical telescopes in the Eastern Han Dynasty, and Zhang Heng's theory may be a coincidence between imagination and fact. But the "Jingfang" of the Western Han Dynasty also described the cause of moonlight. Shen Kuo, a scientist in the Northern Song Dynasty, recorded in detail the reasoning behind the relationship between the moon and the sun in "Mengxi Bi Tan". The sun and moon are shaped like pills. How to know it? It can be verified by the monthly profit and loss. The moon itself has no light, especially the silver pill, and the sun shines brightly. When light first appears, the sun is beside it, so the light looks like a hook from the side; as it gets farther away, it shines obliquely and the light is slightly full. Like a projectile, half of it is coated with powder. If you look at it from the side, the powder will look like a hook; if you look at it from the opposite direction, it will be round. This is how you know it is like a pill. " The theory of a round sky and a round place and the Huntian Many people think that ancient Chinese people believed that the sky is round and covers the square earth. This perception is affected by the "round sky and earth theory" and deviates from the original meaning of the sky and the earth. The idea of a round sky first appeared in "Yu Shu Yao Dian" of Shangshu. It is said that Emperor Yao ordered Xihe and Haotian to observe the stars and found that the stars rotated accurately along a fixed trajectory, which was called "the sky is round". Later, Xihe, Xizhong, Hezhong and Heshu were ordered to investigate in four directions, which was called "place". It was ordered that Xihe, who admired the sky like the sky, looked like the sun, moon and stars, and taught people the time. Then Xihe, Xizhong, Hezhong and Heshu were ordered to go to all directions. Therefore, the round sky and the square place are talking about an activity of ancient astronomical and geographical investigation, rather than the shape of the heaven and earth that we now think of. Yang Xiong of the Western Han Dynasty first proposed the concept of "Huntian" in his book "Fayan". The Eastern Han Dynasty book "Annotations on the Armillary Sphere" completely records the conjecture of the "Huntian theory", proposing that the heaven and earth are the same as eggs, and the sky is like an egg shell wrapping an egg yolk. The sky is like a chicken. The heavenly body is round like a pellet, and the earth is like the yellow inside of a chicken. They live alone in the sky. The sky is big and the earth is small. The "Zhonglu Chuandao Ji" written by Shi Jianwu, the number one scholar in the Tang Dynasty, has more comprehensive records. It not only explains that the earth is round, but also describes the movement of the sun, moon and stars, and puts forward the conjecture that the planet moves in a circular orbit. This is very close to today's astronomical observation results. Zhong said: "Chaos is first divided, and Xuan Huang is positioned. The shape of heaven and earth is like an egg. Among Liuhe, it is round like a ball. The sun and the moon come and go, moving above the day and under the earth. Things go up and down, moving around like a wheel. In addition to the above two points, our ancestors also measured the average angular diameter of the sun and the moon, and the error was only 2' from the actual value. In fact, our country has been observing astronomy since primitive society. Records of sunspots, solar eclipses, and Halley's Comet can all be traced back to before the Xia and Shang Dynasties. Therefore, the ancient Chinese never believed that the earth was square, but always knew that the earth was round. In fact, China discovered that the earth is round earlier than Western countries, but the ancient Chinese only had theories and did not conduct empirical research.

So much nonsense! So much nonsense! So much nonsense!

In the end it sucked. Not much different from eunuchs

It's written like a running account, stiff, and the whole plot doesn't have any inner drama or waves.

It turns out that this is a class novel, and most of the plot is about giving classes to individual characters.

I remember that corn was planted right after the wheat harvest, and it would be ready for harvest at the end of October.

During the Li Shimin period, bamboo slips were still the main method, right? It was not until Wu Zetian's time that papermaking and printing processes were improved

It doesn't matter if you don't look tired if you run a running account... However, The classic duck eats locusts (locusts are grasshoppers. Excessive hormone secretion changes their appearance, and locusts are poisonous and ducks will not eat them)... Classic Slavs began exploring Siberia in the tenth century...