Chapter 38                                                             �

Zhou Mengchen didn't say much, so he started proof directly. He said: "Suppose, you can use a trigonometric function to find the height of the sun."

"I won't forget it here. I just bought the data of the ancestors. Although I think this data is not very correct and a little bit less, there is no problem using it. In the Zhou Ting meridian, the distance between the sun and the earth is about 80,000 miles. If the sun is observed at the same time, in different places, even in Beijing and Wuchang, the angle of the sun should be the same."

"But in fact, the ancients had known for a long time that the angles of the sun in different places were too big."

"This kind of data is no longer an error. It can only be said that the earth is definitely not a plane, and it is spherical."

Zhou Mengchen's few words made Feng Li suddenly enlightened. He couldn't help but say, "So that's it."

The rich astronomical records in ancient China were even in later generations, and it was a major resource for Chinese astronomy. There were so many measurements of the height of the sun, and countless measurements were made.

It can be said that the basic skill of ancient Chinese astronomy is to measure the projection of the sun, and divide it into twenty-four solar terms and seventy-two marquis according to the changes in the projection of the sun, and finally form a rigorous calendar. It can be said that anyone who has a little research on astronomy generally measures the projection at noon on the winter solstice.

During the Western Zhou Dynasty, a conclusion was drawn, which was called a thousand miles apart, and the shadow of the sun was one inch.

It means that a place a thousand miles apart is projected by an inch apart.

Of course, this is not correct. The error is very large.

Many astronomers later made many corrections. I won’t go into details.

But one thing is certain.

The projection of the sun on the sundial is different, but in fact, the angle between the sun and the ground has changed.

Even if the distance between the sun and the earth, which was not accurate in ancient times and had a huge error, is 80,000 miles, if the earth is a plane, a gap of more than hundreds of miles and thousands of miles, the change in the sun's angle should be almost negligible, and it should not be so drastically changed.

This can only show one thing: the earth has a curve.

Zhou Mengchen's words are naturally understood by those who can understand them at first, and are naturally confused by those who don't understand.

The prince of Chu was confused, with his eyes innocent, cute and ignorant, and looked like "Who am I? Where am I? What am I doing? Why am I here?"

Zhou Mengchen could only write on the blackboard, drawing several pictures of what was almost explained, using it to represent the positional relationship between the earth and the sun. He wrote most of the chalk in his hand. Zhou Mengchen breathed a sigh of relief, thinking that he could finally understand this. So he put the meaning, and he tapped his finger and bounced his fingers around the magic skill, and popped the chalk head outside the window.

This is a habit of Zhou Mengcheng.

After all, Zhou Mengchen was also favored by teachers and was often on the blackboard to solve problems. After Zhou Mengchen finished writing, he was used to popping the chalk head into the chalk box or outside.

But he never expected that his bullet was very accurate and went straight to the window. But he didn't notice that there was someone outside the window. It was either someone else, Li Yunzhen and Tao Yuan'er. The chalk head hit Li Yunzhen's forehead without bias. Li Yunzhen screamed in surprise. Then he saw that so many people in the room looked at her. He suddenly turned around and left.

Seeing this, Tao Yuaner chuckled and then followed Li Yunzhen away.

When the prince of Chu saw Tao Yuan'er, he felt that his body lightened. It seemed that dozens of kilograms of fat had been removed. His whole body and mind were about to fly up, and he immediately forgot everything Zhou Mengchen said.

What trigonometric function, what is the distance between the earth and the sun, and where is my zodiac?

The prince of Chu did not say a word or greeted the people here, and even left the seat.

This action can be said to be very rude.

However, as the prince of the King of Chu, he never cared about the so-called etiquette, and outsiders could not use etiquette to restrain him. Therefore, the prince of the King of Chu left. The others breathed a sigh of relief.

The same is true for Zhou Mengchen.

Only when the uninvited guest of the Prince of Chu, the prince of Chu, left, the situation in the classroom was considered to have returned to the formalities.

Feng Li said: "As soon as this statement is released, the theory of the sky is overwhelming, and the theory of the sky can be stopped."

Zhou Mengchen said, "I thanked Uncle Feng Shi's praise, but my nephew was ashamed of being accused of taking responsibility."

Feng Li said: "What's there to be something that I dare not take, but there is no perfection. I'm afraid I can't convince the public."

Many people think that the concept that the earth is circle was introduced from the West, but in fact, the mainstream view of ancient Chinese astronomers, that is, Huntian theory. However, supporters of both sides have always had it. It is a debate between air-to-air. You can see from the debates in the forum that it is difficult to win or lose such a debate.

This also caused many ancient Chinese theories to coexist.

Zhou Mengchen said, "I would like to ask for advice from Uncle Feng Shi."

Feng Li said: "I think your book has an unfinished meaning. You should use this method to measure the distance between the sun and the earth, prove that the ground is round, and find out several types of problems that are easier to calculate with trigonometric functions, solve them together and attach them to the back. This is how easy it is to understand."

Zhou Mengchen's entire book focuses more on various deductions, and has extended the axiomatic concept system, so there are indeed no examples attached.

Because Zhou Mengchen thought that such a simple thing would require any other examples.

I don't bother to worry about that.

But Feng Li is different.

As I have said before, ancient Chinese classics were almost all sorts of exercises. So in Feng Li's opinion, Zhou Mengchen's book would be problematic if it was not added to the exercises.

Zhou Mengchen said: "Uncle Shi taught me a lesson."

Feng Li said: "Especially, you must write the process of proving that Huntian said well. I will send it to Beijing for you. With this book in Beijing, it is no problem that you become famous in Beijing. At least one county magistrate will never dare to make things difficult for you again."

Zhou Mengchen was slightly moved and said, "Thank you, Uncle Shi."

In fact, Zhou Mengchen also understood that Feng Li had been helping him. Just like today, Feng Li brought more than a dozen people, and these people were at least a scholar, and many of them were juren. It can be said that after today, Zhou Mengchen made friends with so many people in the Shixiang. Even though he had no fame, he was still a member of the Shixiang in Wuchang.

Shilin is a circle.

Although most of the people here have fame and fortune, the main body of the Shilin is also composed of Jinshi, Juren, student, etc., but it does not mean that everyone in this circle has fame and fortune. Not to mention anything else, the Eight Beauties of Qinhuai are definitely people in the Shilin circle.

But have they made great achievements?

Although this example has some extremes, it also shows that there are some influential people in the Shilin circle, but they are not people with fame and fortune, such as Taoist priests, monks, hermits, etc.

Although these people cannot be the main body of the Shilin circle, making friends with so many people in this circle itself represents a lot of resources, just like people from the middle and lower classes of the upper class.

It can be said that if the county magistrate acted one day later and knew that Zhou Mengchen had made so many juren, he would probably have to take Zhou Mengchen into consideration.

After Feng Li, the atmosphere became warmer.

Although these scholars have specialties in reading books of sages, otherwise they would not have had their current fame and fortune, they could not understand the trigonometric function explained by Zhou Mengchen for a while.

So, people asked questions one after another.

Zhou Mengchen did not dare to neglect and answered one by one without mentioning it.

Without the two troublemakers, the Crown Prince of Chu and the County Master, the academic conference was successfully completed.

Zhou Mengchen had money, so he was naturally generous. He invited these people to a table of ten taels at noon.

After a banquet, Zhou Mengchen naturally sent everyone away.

Uncle Zhang stayed at the end, took out a bound book from his arms and said, "Your manuscript has been translated so messy that everyone is a little embarrassed. I copied it. I will return it to you instead of the manuscript."

Zhou Mengchen took it with both hands and said, "It's okay, it's just a small matter."

Zhou Mengchen didn't open it either and took it away.

For him, he has mastered what he wrote for many years. Even if he doesn't have it, it will only take several days to write it. Even if he doesn't have a draft, it's not a big deal. This is what Zhou Mengchen didn't value this book too much from the beginning.

For some people, it is a pioneering word, and cannot be said to be unprecedented, but it is also a different world.

But for Zhou Mengchen, it is probably equivalent to silencing some mathematical concepts in junior high school. The biggest problem is that Zhou Mengchen has graduated for many years. It is not easy to recall things in full back then, but since Zhou Mengchen has recalled them completely, he will not forget them for a long time.

"Mr. Zhou, do you have a lot of adults? Today I already know that I was wrong, so I can give up the younger ones." As they were talking, they saw two people coming over and kneeling on the ground and wailing.

These two people are nothing else, just the county master and Liu Shiye.

The county magistrate was still as embarrassed as before, with a swollen face like a watermelon, and his clothes seemed to have been beaten several times on the ground, and none of them were clean. However, Master Liu is the same now, with a bruised nose on his face, as if he was beaten up.

Zhou Mengchen glanced at him and guessed in his heart. If he was probably right, Master Liu's beating was done by the county magistrate.

The county priest walked several steps on the ground, hugged Zhou Mengchen's thighs, and said, "I am short-sighted, I don't know that Mr. Zhou is a master of knowledge, and it's all my fault. I also think that I am old and weak, have an old mother and a wife and children. Let me spare me once."
Chapter completed!