In a few days, Guanshishan Academy will also be on holiday.

After several years of development, the academy has slowly entered the right track, and it has also attracted some students from outside the Chu Wangfu system to join it.

Today, Li Kuan just came to take a bath in the hot spring in the corner of the academy, and Xu Jingzong persuaded him to give a speech or give a class.

Li Kuan originally wanted to refuse, but seeing that even Fang Yiai, who had always been unlearned, looked expectant, he simply agreed.

It just so happens that the East China Sea fishery has gone to sea in recent years, and it is going to the Japanese country and the South China Sea.

And his own little corn also caught the globe when he caught Zhou.

Li Kuan felt that it was time for everyone to change their understanding.

When he came to the lecture hall of Guanshishan Academy, this newly built landmark building, which can accommodate thousands of seats, was already full.

Many people were already standing in the aisle, just to hear Li Kuan's lecture for the first time.

"With so many people here today, this king feels a little stressed."

Li Kuan came to the middle of the lecture hall with a smile and started today's lecture.

With the students of Guanshishan Academy, there is no need to be so polite, this way of doing things is also what Li Kuan admires in the academy.

"It is estimated that many curious students have already seen the ball in my hand, which is what my daughter caught when she caught Zhou, and the lesson I want to talk to you today has something to do with this ball."

After Li Kuan finished speaking, he picked up the globe, walked to the students in the front row, and gave them a look.

"The ancients called the undivided heaven and earth and the beginning of chaos as Taiji, and Taiji gave birth to two instruments, which drew out yin and yang, and divided heaven and earth. If you look at it a little, you will find that all round objects have the characteristics of being active and unstable, just like the round sun and moon, and like this restless ball in my hand; And all square objects generally have the characteristics of being static and relatively stable, they are like the quiet earth, which is the understanding of the heaven and the round place of the heavens. ”

Li Kuan didn't tell everyone as soon as he came up, the sky is not round, the earth is not square, you are all wrong, and then crackled and preached.

This kind of lecture made Li Kuan can't help but think of his former primary school teacher, a rural primary school in the nineties, and the level of teachers is really ......

Thinking back to their classes, it was really cramming, almost preaching there according to the textbook.

It makes people not want to learn at all.

"There are a few people who are here today who have been to sea, and many of you have probably heard of it. The king asked them a few questions. ”

Li Kuan looked at Fang Yiai and Wei Chihuan in the front row, as well as Cheng Chumo, who had just returned from the Wa Kingdom, and felt that if they could really listen to this course, maybe there would really be a Columbus of the Tang Dynasty.

"Lord Wang, what do you want to ask, just ask me Wei Chihuan."

Yu Chihuan stood up with great interest.

"The king's question is actually very simple, that is, when you are in the middle of the vast sea, a ship is coming from afar, so what part of the ship is the first thing you see?"

"Of course it's the mast, everyone knows about the people who drift on the sea."

Wei Chihuan was a little puzzled why Li Kuan asked this.

"And when you come across an island with a tall cliff or a mountain, what is the first thing you see?"

Li Kuan continued to ask with a smile on his face.

"We had come across islands with cliffs in the South Seas before, and the first thing we saw was the strangely shaped rocks at the top of the cliffs. As for the mountains, it is common to see clouds and mist on the top of the mountain. ”

Although he didn't understand why Li Kuan asked this, Wei Chihuan still answered this question truthfully.

"We all think that the sky is round, so haven't you ever wondered why when you see ships and islands in the distance, the first thing you see is the top? Shouldn't you ship or island? It's like if you walk out of the lecture hall and see the Gewu Building on the other side, you see the whole building, not the roof of the building. ”

As soon as Li Kuan's question was raised, the lecture hall fell into a brief silence.

yes, why is that?

Even Fang Yiai, who has developed limbs and is simple-minded, feels that there seems to be something wrong with this.

"Lord Wang, could it be that the ships and islands you see at sea are far away after all, so you can't see clearly at first?"

After frowning and thinking for a moment, Yu Chihuan gave an answer that he didn't quite recognize.

"The mast is a relatively small object in the bow, and if it is so far away that you can't see the hull clearly, won't the mast be even more invisible?"

Li Kuan's rhetorical question directly denied Wei Chihuan's speculation.

"Lord Wang, what do you think is the reason?"

Fang Yiai is very single, with a look that I really don't know, and asked Li Kuan rhetorically.

"This king has a hypothesis, I will say it for everyone first."

Li Kuan did not directly answer Fang Yiai's question, but walked back to the podium and picked up the globe.

"Suppose there are two bowships at opposite ends of the ball, and they are walking in the opposite direction along the sphere, then at first, the people on the two bows must not be able to see each other, right?"

Yu Chihuan: "Of course, the bulge of the sphere blocks the field of vision. ”

"So when these two ships are getting closer, what is the first thing they see each other?"

After Li Kuan finished speaking, he looked at Wei Chihuan, who thought of a question he had just answered, as if he realized something, and said a little unconfidently: "It should be a mast, right?" ”

"Huh? Mast? Just now, the prince asked us what was the first thing we saw when we saw a ship in the distance in the vast sea, and the actual situation was also a mast, which ......"

Fang Yiai felt that his brain was not enough.

Why are the answers to both questions the same?

It's kind of unreasonable.

Many of the students in the lecture hall also fell into deep thought.

Wei Chihuan said that he first saw the mast of a distant ship in the sea, and no one could answer this reason.

However, in the hypothetical situation of His Royal Highness the King of Chu, the people on the two ships also saw each other's masts first.

This......

Could it be ......

Many people were shocked, held their breath, and looked at Li Kuan with eager faces.

Li Kuan was very satisfied with everyone's reaction.

"Master, could it be...... Is the earth round? ”

Di Renjie, who was sitting in the front row, threw out an explanation that shocked everyone.

"No way, how can the earth be round?"

Wei Chihuan looked at Li Kuan in disbelief.

"Lord, if the earth is round, won't the people who live below fall down?"

Li Yan, who was sitting in the front, couldn't help but ask questions

"The king then assumes that if the earth we live on is not square, but a very, very large sphere, then the original question is not explained?"

Li Kuan did not rush to defend himself, but let everyone think for themselves.

Yu Chihuan: "This ......"

Fang Yiai: "It sounds very reasonable, but someone just said that if the earth is round, wouldn't people fall down?" ”

Fang Yiai and Li Yan's point of view is estimated to represent many people's doubts.

However, Li Kuan is already very satisfied with everyone's reaction.

It's good that everyone is entangled in some explanations that don't make sense, instead of blindly denying because of negation.

If Kong Yingda's gang were to sit here, it was estimated that they would immediately jump out and cite a bunch of so-called sages to oppose Li Kuan, and maybe they would have to buckle a few more big hats for Li Kuan.

Just like when Copernicus proposed heliocentrism, he was finally condemned by the Inquisition as a "heretic" and burned to death in Campo de' Fiori in Rome.

"You have a good question, and to answer this question, we need to go back to the experiment that this king did on the roof of the Gewu Building."

"Is that the test of throwing iron balls? What does this question have to do with that? ”

Living on a ball yourself?

Yu Chihuan found it difficult to accept this statement.

"No, who says it doesn't matter? Through that experiment, it has been proved that there is a force in this world, called gravity. Gewu students have proposed a set of calculation formulas for gravity, although the specific parameters have not been calculated, but all objects in this world are affected by gravity, this view has been widely recognized by everyone in Gewu Academy. ”

As soon as Li Kuan's words were finished, Di Renjie couldn't help but say, "Master, are you saying that people who live under the earth will not fall because they are affected by gravity?" ”

"That's right, because the earth is round, then for people who live in every place, their heads are above the sky, in fact, the saying that they fall down does not exist in itself."

Li Kuan's answer once again plunged the lecture hall into silence.

Although few people can really accept the statement that the earth is round, for a while, it seems that there is nothing to refute.

Whether it is the order in which the ships and islands appear in front of them, or the explanation of gravity, it seems to support the statement that the earth is round.

On the contrary, the ancient view that the earth is square does not seem to hold up evidence.

"Lord, if you say so, wouldn't it be true that the ship would be able to go in one direction and eventually return to its original place?"

After being silent for a while, Wei Chihuan asked a question again.

"Yes, could it be that after we go to the South Seas, we will continue to travel south and finally return to Hangzhou?"

Fang Yiai also does not believe in this inference.

When going to the South Seas, the ship was obviously getting farther and farther away from Datang, how could it be possible to return to Datang in the end?

"You can't go to the South Seas!"

"Huh? Didn't you say that the earth is round, why do you say that you go all the way to the south and can't return to the Tang Dynasty in the end? ”

Yu Chihuan seemed to have found the shortcomings of Li Kuan's strange theory, and his face became excited.

"The king is saying that the earth is round, and if you go all the way to the south, you will not be able to come back unless your ships can walk on land, on the icy continent of the extreme south. Because except for Datang, not all the oceans on this earth. ”

When Li Kuan said this, Wei Chihuan was a little unconvinced, but he didn't know how to refute it for a while.

"Master, it doesn't work to the south, and it shouldn't work to go to the extremely cold land that seems to lead to the north. So if you keep walking east, is it possible to finally return to Datang? ”

Di Renjie's brain is obviously more active, and he came up with a scheme that seems to prove that the earth is round.

"Well, before answering everyone's question, I'll show you this ball." Li Kuan once again took the globe and occupied the vicinity of the front row, "This king calls this sphere a globe." ”

Di Renjie: "Globe? ”

"That's right, this is a globe that this king speculated to make after combining the travelogues left by various Hu merchants and ancestors, which simply describes some countries and seas outside the Tang Dynasty. Although because of the irregular distribution of the sea and land on the earth, it is impossible for us to drive the ship back to Datang in the same direction. However, we can still find a path that proves that the earth is round. ”

After Li Kuan finished speaking, he put the globe in the hands of Di Renjie, who was coming around.

This is an unqualified globe.

The continents and oceans on the surface were all depicted by Li Kuan according to the geography books in the nine-year compulsory education textbook.

Don't look at Li Kuan's reputation as the No. 1 talent in Chang'an City, in fact, he is so good at painting and calligraphy that he can't do it at all.

However, the globe in water is also a historic idea of great significance.

"Master, is this Chang'an?"

Di Renjie looked at the globe in his hand, and did not rush to think about how to find a route that could go around and return to Datang, but his eyes were wide open, looking for where Chang'an was.

"That's right, this is Chang'an."

"Hangzhou is here, and Nanyang is this piece." After Di Renjie found the positioning coordinates, he quickly discovered some key locations marked by Li Kuan, "Master, this globe will be good, right?" How come there are such large oceans and continents in the South China Sea? ”

The Tang Dynasty is a dynasty full of self-confidence.

From the princes and nobles to the common people, they all believe that the Tang Dynasty is the center of the world.

Suddenly saw that on the globe, Datang only occupied a small area, and there were more extensive land and seas in the world than Datang, which was still difficult to accept for a while.

"No, there's nothing wrong with that. The world is very big, and outside of Datang, there is no cave. For example, an animal with a grain yield of several thousand catties per mu, an animal with a pocket on its belly, an animal with a neck longer than a person, a fish that eats people, a tree that bleeds, and all kinds of things that everyone thinks are impossible, maybe one day, they will appear in front of everyone's eyes. ”

Di Renjie: "How many thousand catties of grain per mu? This...... It can't be, right? ”

Li Yan: "Trees still bleed?" Isn't that a dryad? ”

But Li Yixie and Li Geng, who were sitting in the corner, glanced at each other, and their eyes shone with fiery light.

Li Yixie is the son of Li Junxian, and Li Geng is the son of Li Zhong.

Although the fathers of the two competed, the relationship between Li Yixie and Li Geng was very good.

Today, it was also because Li Zhong once said that he wanted to go to Guanshishan Academy to study, so Li Geng took Li Yixie to visit the academy, but he didn't expect to run into Li Kuan's lecture.

"Yixie, what the prince said about thousands of catties of grain per mu, do you think it's true or false?"

"It sounds like a joke, but looking at the expression of His Royal Highness the King of Chu, it seems that he firmly believes that this thing exists."

Li Yixie has a lot of experience in the changes in the expressions of characters, and can accurately judge whether people are telling the truth or a lie from the expressions of others.

This is the most important skill that Li Junxian taught him.

As an important escort force around the emperor, it is not enough to simply have a high force value, but also to be careful enough, to be able to observe words and feelings, and to detect dangers in time.

Obviously, Li Junxian has all these conditions, otherwise he would not be able to sit in this position for a long time.

As for not ending up miserably in the second half of his life, it was purely a bad fate, and he took the blame for Wu Zetian.

No matter what kind of trust or feelings, in front of the throne, they are as light as a feather.

"I decided, I will go to sign up for the assessment of Gewu Academy in a while, and I heard that only when I enter Guanshishan Academy can I enter the library to read books and listen to some lectures inside the academy."

Li Geng made a decision in his heart and immediately began to prepare.

Li Yixie had a good relationship with him, and naturally guessed his thoughts, "None of us have ever been to the sea, if we want to find a grain yield of several thousand catties per mu, it is best to worship under His Royal Highness the King of Chu, and then use the power of the East China Sea fishery to explore." ”

"That's right, but His Royal Highness the King of Chu won't accept apprentices, so we can only retreat and worship the Guanshi Mountain Academy."

Li Geng and Li Yixie glanced at each other and smiled knowingly.

The two of them have been doing nothing all these years, but their respective fathers' exploits are very prominent, which makes them always have a kind of pressure to beat their fathers.

This is probably also the common idea in the hearts of many aspiring noble children.

In addition to expanding the territory, the greatest achievement is to solve the problem of eating for the common people in the world.

That mu yields thousands of catties of grain, if it really exists......

As the person who discovered and brought them back to the Tang Dynasty, they are destined to be famous through the ages.

Of course, at this moment, Li Kuan really answered all kinds of questions for the problem boy Di Renjie, and he didn't know that the two hot-blooded young men in the corner actually set a great goal because of their words.

After Li Kuan finished today's speech at Guanshishan Academy, he immediately asked a skilled craftsman to carve a huge globe and place it at the entrance of Gewu Academy.

And this has become a landmark object of Guanshishan Academy for thousands of years, although after several wind and rain, wind and sun, the clarity is getting lower and lower, but it is one of the most important objects in the Gewu Academy.

But that's all for later.

After releasing such a big satellite, the earth is round, and the saying that everyone is standing on a earth has also spread in Chang'an City, and it immediately caused a very big response.

Although this statement seems a bit difficult to refute, many people do not want to believe that it is true.

What's more, it is said that Li Kuan is lying to confuse the public.

However, Li Kuan just treated them as a fart!

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