In ancient times, maps played a crucial role in the victory or loss of a battle. When Jing Ke assassinated Qin, the stepping stone he took was the map of Yan State. During the Warring States Period, having a map of a country and a city was basically the same as occupying.

In the Tang Dynasty, due to the thousands of years, especially after the Three Kingdoms era, various places fought endlessly and broke up and reunion. There was no longer the distinction between "Qin land" and "Chu land", the map also changed from being secretly unanimous to a "relatively open secret" mastered and circulated in the hands of some people, especially in the hands of military clans. But even so, the map still has very few people, and the accuracy is diverse.

An accurate map can play a very huge role in the hands of warlike generals. For example, if a valley is marked on the map, the general will know in advance and ambush it, setting up a "pocket array" to wipe out all the enemies. However, on the side using the inferior map, there is no valley on the map, and you will be caught in an ambush and you will not even have the chance to resist.

This is just the simplest effect brought by an accurate map, and there are many uses. Li Shimin was born in the army. When fighting, the map was a thing that was with his weapons and was always left and right.

Li Shimin couldn't help but fall into a fascination when he looked at the map. He stretched out his hand and followed the lines on the map, and found that both the exquisiteness and the marks on this map were several levels higher than the map he had seen before.

Compared with this picture, the map Li Tai drew is simply garbage!

"Good picture!" Li Shimin couldn't help but laugh. He looked at Empress Changsun and said, "Empress, God gave me a Li Mu, which can be worth millions of soldiers! I really don't know, is there anything he can't do? Talent, no, he is a genius!"

Li Tai also looked proud and said, "Yes, Father, brother is a genius!"

Before Empress Changsun could speak, a voice suddenly came from the door: "Qingque, it's rare that you can still say good things to me in front of your father... But you have a good eye, you are right, brother, I'm a genius, hahaha..."

Li Tai turned around and saw Li Chengqian's smug face. He smiled bitterly and said, "Brother Prince, I am not talking about you, but our elder brother, Li Mu, the Marquis of Zhulu."

"Uh..." Li Chengqian's smile froze on his face, and he was extremely embarrassed. He forced himself to win over the emperor and laughed loudly, saying, "It's okay, it's okay, my brother is a big genius, I am a little genius, although he is awesome, I am actually not bad recently."

As Li Chengqian spoke, he suddenly saw the map, his eyes widened: "Where did this come from? There is such a map in the world?"

Li Shimin smiled and said, "Li Mu painted it, Chengqian, come and see, how is it painted?"

"Oh my god!" Li Chengqian almost lay on the map, looked from top to bottom, from left to right, and exclaimed: "Father, I really don't know how my elder brother drew it. This... I can't think of it."

When Li Shimin heard this, he also asked, "Qingque, didn't you ask how he drew it? Or did he refuse to say it?"

"Father..." Li Tai lowered his head and said, "It's not that the eldest brother refused to say it, but... the child didn't understand."

"Don't understand?" Li Shimin was extremely surprised. Among all his sons, why did he like Li Tai the most? The main reason was not Li Tai's fat, but Li Tai's cleverness. Li Tai was the best in all his sons. As for obesity, he could not practice martial arts, but for Li Shimin, it was not a big problem, because he experienced the alternation of Sui and Tang Dynasties and knew that it was easy to fight the country, but difficult to sit in the country. You can fight the country on the horse, but you can't sit in the horse. Therefore, it is not a problem to not practice martial arts.

Now that Li Tai said that he didn't understand Li Mu's words, Li Shimin felt that he was very incomprehensible. What kind of theology is that it can reach the level of incomprehension? Li Shimin is very clear about Li Tai's geographical attainments, and he is not weak at all compared to the great people in the world!

Li Tai measured a circle and said, "Father, brother said that the earth under his feet is round, so the map should have a certain arc. The map I drew was just about this arc, but I couldn't figure it out. How could the earth be round?

"round?"

Li Shimin also compared and said, "He said it was round?"

"How can it be round..." Empress Changsun was also puzzled and asked, "Li Mu didn't say anything, why did he think it was round?"

"I gave an example, saying that the Yangtze River flows eastward, thousands of years but never ends. Why can it not end? Because the earth is round, the water goes around and returns to the west, so it will never end. But the child feels that something seems to be wrong, but the child has not yet made a mistake and dares not argue with his elder brother."

"Is this statement..." Li Shimin was also confused. He was not good at astronomy and geography, and he couldn't tell why. While frowning and thinking, he suddenly found that the map in front of him seemed to be moving. When he looked down, he saw that Li Chengqian had already rolled up one-third of the map, obviously he was going to steal it!

Li Shimin was furious and slapped the map with a slap, and another slapped Li Chengqian on the back of the neck, cursing: "Don't you dare to steal my map?"

Li Tai was stunned by the side and quickly said, "Father, this is the map of the son minister!"

Li Shimin was extremely surprised: "Don't you want to offer it to me?"

"I never said I would like to offer it to my father, I just want to show you-"

Li Shimin seemed to have not heard it clearly and said, "You haven't said anything?"

"Dedicated to the Father--"

"Good son!" Li Shimin rolled up the map and put it in his arms, patted Li Tai on the shoulder, and said, "I will accept your wishes and retreat. I am tired of it! A high-ranking official, send the prince and the King of Yue out."

“…”

“…”

The two brothers looked at each other and came out of Tai Chi Palace with their heads hanging down. As soon as they left the hall, Li Chengqian couldn't help but complain and said, "Qingque, are you stupid? My father has fought a lifelong battle and how could he not want such a good map? Next time there is such a thing, please show me. I really won't take away what I have to do. I'll pay you back after reading it."

"Haha," Li Tai glanced at Li Chengqian and said angrily: "Brother, I don't believe what you said. Once you bought Tianhua Ji in the West Market and missed 30 stagnant coins. I lent it to you. It's been a year or two months since then. Have you paid me back?"

"There is such a thing?" Li Chengqian was shocked and yelled: "Oh, look at my brain, I have completely forgotten it, hahaha... Don't worry, I'll give you something to you some other day, I have something to do, let's go first!"

"Brother Prince! Don't leave, what day will it be the next day?"

"One other day is another day. My grand prince can still save your money!" The voice became farther and farther away. I heard that I had to pay back the money, and Li Chengqian ran very fast. Li Tai, the fat man, would definitely not be able to catch up with him.

...

In Tai Chi Palace, Empress Changsun hugged Li Zhi who was asleep again and couldn't help but complain, saying, "Your Majesty, how can you steal the child's things? If you want a map, just let Li Mu draw another one."

"Do you think I want it? I have asked Qingque for a map. Qingque can still ask Li Mu for one. But if I ask Li Mu, I can't guarantee that this kid will exchange it. I'm a little afraid of him now, so I can't plot against him. Let me be safe for a few days and wait until the New Year is over."

"You," Empress Changsun smiled, picked up Li Zhi, and said, "Zhinu is asleep again, I will go back to Lizheng Hall first."

"Okay, I'll go to dinner."

Li Shimin watched Empress Changsun go out and winked at Eunuch Gao. Eunuch Gao walked to Jikuo and muttered quietly at a sound transmission device. After about a stick of incense, Yuan Tiangang walked out of the secret passage.

"Your Majesty, what's the matter to summon the minister?"

"Look at this map." Li Shimin expanded the map to Yuan Tiangang and asked, "What do you think?"

Yuan Tiangang's eyes narrowed slightly, he looked carefully, and said, "Your Majesty, this is the most accurate map I have only seen in my life. Who has drawn it?"

"Li Mu."

"Oh..." Yuan Tiangang suddenly realized, but saw no surprise. As if everything unexpected was done by Li Mu, it would not be surprising.

"I just heard a strange thing. Qingque told me that it was Li Mu's words. He thought that the earth under his feet was a circle. Because he thought it was a circle, the Yangtze River flowed eastward and would never flow all the time, because it would go around again and again... I was confused. You are my Imperial Heaven Supervisor and are well versed in astronomy and geography. Do you think Li Mu's statement is reasonable?"

"This..." Although Yuan Tiangang was a good Taoist priest, claiming to be counted for five hundred years and five hundred years, he was an ancient man after all. He didn't know anything about science. After thinking for a long time, he couldn't find out where he was. Suddenly he remembered something and said: "Zhang Heng of the Han Dynasty once wrote "The Notes of Zhang Heng's Armary Sphere", which once said that the sky was like an egg. The celestial body was round like a projectile, and the earth was like a yellow in the egg. It lived alone in the sky, and the sky was large and the earth was small. There was water inside the sky, and the sky covered the ground, just like the yellow shell wrapped in the shell. It seemed to have the same effect as Li Mu said. Since the celestial body could be like an egg, the earth under our feet seemed to be like this, but this was all conjecture and could not be verified."

Yuan Tiangang murmured to himself, saying, "Even if it is true as Li Mu said, the earth under his feet is a circle... it must be seen at a very high place, how can Li Mu know--"

Li Shimin frowned and continued, "If he is really a banished immortal, wouldn't he be able to explain it?"

When Eunuch Gao heard this, he laughed and interrupted: "Your Majesty, the so-called exiled immortal is nothing more than rumors in the market and is not enough to believe it."

Yuan Tiangang said, "Your Majesty, I am a Taoist priest. Although I have never seen an immortal, there are many seniors who practice immortals and seek Taoism. I also believe in gods. Whether Li Mu is a banished immortal is not sure. But if he wants to explain his magical magic, I am afraid that only this reason can explain it."
Chapter completed!