In ancient times, maps played a crucial role in winning or losing a battle. Jing Ke stabbed Qin, and the stepping stone he took was the map of Yan Kingdom. During the Warring States period, having a map of a country and a city was basically the same as occupying it.

And in the Tang Dynasty, due to the millennium, especially after the Three Kingdoms era, various places have been fighting endlessly, divided and merged. There is no longer a distinction between "Qin Land" and "Chu Land", and the map has changed from being secret to a "relatively open secret" that is held and circulated in the hands of some people, especially the military gate lords. But even so, maps are only a minority of the population, and their accuracy varies.

An accurate map, in the hands of a warlike general, can play a very huge role. For example, if a valley is marked on the map, the general knows in advance that he can ambush and set up a "pocket array" to annihilate all the enemies. And the side that uses the inferior map, there is no valley on the map, and they don't know if they are ambushed, and they don't even have a chance to resist.

This is only the most superficial utility of an accurate map, and there are many uses. Li Shimin was born in the army, and when he was fighting, the map was something that could not be separated from his blade.

Li Shimin looked at this map and couldn't help but be fascinated. He stretched out his hand and traced the lines on the map, and found that both the delicacy and the markings on this map were several notches higher than the map he had seen before.

The map that Li Tai drew before is simply rubbish compared to this one!

"Good picture!" Li Shimin couldn't help but stroke his palms and laughed, he looked at the eldest grandson queen, and said: "Queen, God gives me a Li Mu, which is worth a million male soldiers!" I really don't know, is there anything he won't know? Talent, no, he's a genius! ”

Li Tai also looked honored, and said: "Yes, father, the eldest brother is a genius!" ”

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

Li Tai turned around, saw Li Chengqian's triumphant face, smiled bitterly, and said: "Brother Prince, I'm not talking about you, it's our eldest brother, Li Mu, the Marquis of the deer." ”

"Uh......" Li Chengqian's smile froze on his face, extremely embarrassed, and he forcibly laughed loudly, and said: "It's okay, the eldest brother is a big genius, I am a little genius, although he is powerful, I am actually not bad recently." ”

As Li Chengqian spoke, he suddenly saw the map, and his eyes widened in vain: "Where did this come from?" Is there a map like this? ”

Li Shimin said with a smile: "Li Mu painted it, Cheng Qian, come and take a look, how is the painting?" ”

"Oh my God!" Li Chengqian was almost lying on the map, looking at it from top to bottom, from left to right, and exclaimed: "Father, the son really doesn't know how the eldest 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 not say it? ”

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

"Didn't understand?" Li Shimin was extremely surprised, among all his sons, why did he like Li Tai the most? The main reason is not that Li Tai is fat, but that Li Tai is smart. Li Tai's reading, calligraphy, arithmetic, and essays were the best among all his sons. As for being obese and not being able to practice martial arts, for Li Shimin, it is not a very big problem, because he has experienced the alternation of the Sui and Tang dynasties, and knows that it is easy to fight the country, but it is difficult to sit on the country. You can hit the country on the horse, but you can't sit on the horse. So it's not a problem that you can't practice martial arts.

Now Li Tai actually said that he didn't understand Li Mu's words, and Li Shimin felt very incomprehensible. What kind of theism would reach the point of incomprehension? Li Tai's attainments in geography, Li Shimin is very clear, and he is not weaker than everyone in the world!

Li Taibi measured a circle and said, "Father, the eldest brother said that the earth under your feet is round, so the map should have a certain arc. I drew a map, and it was just around this arc, but the child couldn't figure it out, how could the earth be round when the sky was round? ”

"Circle?"

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

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

"I gave an example, saying that the Yangtze River is rolling eastward, and it is endless for thousands of years. Why not? Because the earth is round, and the water comes in circles and back to the west, it never ends. But the child felt that something seemed wrong, but the child hadn't figured out the reason yet, and he didn't dare to argue with the eldest brother. ”

"Is this a statement...... Li Shimin is also confused, astronomy and geography, he is not good at it, and he can't say why. When he was frowning and pondering, he suddenly found that the map in front of him seemed to be moving, and when he looked down, Li Chengqian had already rolled up a third of the map, obviously trying to steal it!

Li Shimin was furious, slapped one on the map, and slapped Li Chengqian on the back of the neck, scolding: "Rebel, dare to steal my map? ”

Li Tai was stunned next to him, and hurriedly said, "Father, this is the map of the son!" ”

Li Shimin was extremely surprised: "Aren't you going to dedicate it to me?" ”

"Erchen didn't say that he wanted to dedicate it to his father, Erchen just showed you-"

Li Shimin didn't seem to hear clearly, and said, "You didn't say anything?" ”

"To my father—"

"Good son!" Li Shimin rolled up the map and put it in his arms, patted Li Tai's shoulder, and said, "I will accept your heart, all of you retreat, I am tired!" Gao Gan, send the crown prince and the king of Yue out. ”

“……”

“……”

The two brothers looked at each other and came out of the Taiji Palace with their heads drooped together. As soon as he left the palace, Li Chengqian couldn't help complaining, and said, "Qingque, do you say you're stupid." My father has fought a lifetime of war, and when he sees such a good map, how can he not want it? Next time there is such a thing, you bring it to me to see, I really won't take away people's favor, I'll pay you back after reading it. ”

"Heh," Li Tai glanced at Li Chengqian, and said angrily: "Big brother, I don't believe what you said." You once bought a halberd in the West Market, and you were short of thirty yuan, I lent it to you, and it has been a year and two months now, have you paid me back? ”

"And this kind of thing?" Li Chengqian was taken aback and said, "Oh, look at my brain, I completely forgot, hahaha...... Don't worry, I'll pay you back another day, I still have something to do, so I'll go first! ”

"Brother Prince! Don't go, what day is it another day? ”

"Another day is another day, my dignified prince, I can still send your money!" The voice is getting farther and farther away, I heard that I want to repay the money, Li Chengqian ran fast, and Li Tai, the fat man, will definitely not be able to catch up.

……

In the Taiji Palace, Empress Changsun hugged Li Zhi, who was asleep again, and couldn't help complaining, and said: "Your Majesty, how can you snatch the child's things, you want a map, just let Li Mu draw another one." ”

"What do you think? I asked for Qingque's map, and Qingque could still go to Li Mu to ask for one. But if I ask Li Mu for it, what exchange will I have for this kid if I can't keep it. I'm a little scared of him now, and I can't count him. Let's let me settle down for a few days, and wait until the New Year. ”

"You," Empress Changsun smiled, picked up Li Zhi, and said, "The young slave is asleep again, and the concubine will go back to the Lizheng Palace first." ”

"Okay, it's time for dinner."

Li Shimin watched Empress Changsun go out, and glanced at Duke Gao, who walked to the side of the machine and muttered something in a whisper at a microphone device. After about a stick of incense, Yuan Tiangang walked out of the secret passage.

"Your Majesty, what is the matter with summoning Wei Chen?"

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

Yuan Tiangang's eyes condensed slightly, looked at it carefully, and said: "Your Majesty, this is the most accurate map that the minister has only seen in his life, who drew it?" ”

"Li Mu."

"Oh......" Yuan Tiangang was stunned, but he didn't see any surprise. It seems that everything that is unexpected, as long as it is done by Li Mu, is not strange.

"I just heard a strange thing, Qingque told me that it was Li Mu who said it, and he thought that the earth under his feet was a circle. Because he thinks it's a circle, the Yangtze River flows eastward and never ends, because it will go around and go back again...... I am confused, you are my Qin Tianjian and you are well versed in astronomy and geography, do you think what Li Mu said makes sense? ”

"This ......" Although Yuan Tiangang is a good Taoist, known as five hundred years at the top and five hundred years at the bottom, he is an ancient man after all, and where does he know about things in the field of science. After thinking about it for a long time, he couldn't do anything, and suddenly he remembered one thing and said: "Zhang Heng of the Han Dynasty once wrote "Zhang Heng's Notes on the Armillary Instrument", in which he once said that the sky is like an egg. The celestial bodies are round like projectiles, the earth is like the yellow of an egg, and they live alone in the sky, the sky is big and the earth is small. There is water in the sky, and the sky envelops the earth, and the shell is yellow. It seems to be similar to what Li Mu said. Since celestial bodies can be like eggs, it seems that the earth under our feet can also be the same, but this is all conjecture and cannot be verified. ”

Yuan Tiangang muttered to himself, "Even if it is really as Li Mu said, the earth under your feet is a round ...... That must be seen from a very high place, how can Li Mu know——"

Li Shimin frowned and continued: "If he is really an immortal, wouldn't it be easy to explain?" ”

When Gonggong Gao heard this, he laughed and interrupted: "Your Majesty, the so-called immortal is just a rumor in the market, and it is not enough to believe it." ”

Yuan Tiangang said: "Your Majesty, the minister is a Taoist priest. Although the minister has never seen an immortal, there are many predecessors who cultivate immortals and seek the Tao, and the minister also believes that there are immortals. Whether Li Mu is an immortal or not, it is uncertain. But if he wants to explain all kinds of miracles, I am afraid that only this reason can be explained. ”

"Hmm......" Li Shimin was silent for a long time, waved his hand, and Yuan and Gao both retreated. In the huge Taiji Hall, only Li Shimin sat alone, not knowing what he was thinking.