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Text Chapter 26 Chang¡¯an Prime Meridian

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    "Okay, since Your Highness is so sure, then I have overstepped my bounds!" Li Chunfeng agreed without thinking. Firstly, he did not believe that Li Min could find any way to simplify it. Secondly, he would not suffer any loss even if he lost.  Instead, I learned a way to simplify arithmetic.  As for the two difficult problems in arithmetic and astronomy that Li Min mentioned, he even ignored them.

    The bet between Li Min and Li Chunfeng attracted Yuan Tiangang and Yifan. Only Zhao Fu had no interest in these arithmetic. It was just about Li Min, his immediate boss, so he could only force himself to accompany him.

    "Okay, happy!" When Li Min saw that the other party had fallen into the trap, he immediately roared happily, then took the pen and paper on the desk and explained while writing: "If you want to simplify the current algorithm, the first step is to simplify it.  Numbers, you used to use Chinese characters to calculate numbers, but now we use a new set of numerical symbols to replace Chinese characters"

    Li Min used horrible calligraphy to write out all the Chinese characters from one to ten, and wrote the corresponding Arabic numerals below. He also wrote out the operation symbols such as addition, subtraction, multiplication, and division, and then explained them one by one to Li Chunfeng and the other three.  .  These things are actually just a layer of window paper, and the three of them are all extremely smart people, so they can understand it immediately.

    Then Li Min took the linear equation of two variables that Yifan made just now as an example. He substituted two unknown numbers x and y, listed two equations, and after elimination, one of the values ??was obtained, and the second value naturally came out.  .  All the calculations were done together, but only three or four lines were calculated, and the total time was less than one minute. For Li Chunfeng and the others, this was like a miracle.

    "Thisthisis simply incredible!" Li Chunfeng and Yuan Tiangang were still in shock.  Yifan was the first to say in surprise, and then, regardless of others, he took a piece of paper and tried to calculate other questions according to the method Li Min just said. It was a little awkward at first, but with Li Min's guidance  .  I quickly became proficient, and within a short time, I had completed all the questions on the original paper.

    At this time, Li Chunfeng and Yuan Tiangang finally woke up.  Seeing Yifan's actions, he couldn't help but feel a little itchy, and they all tried the calculation of these numerical symbols themselves.  As a result, I have a deeper understanding of these simple and convenient calculation methods.  For a moment, the look in Li Min's eyes became a little different.

    "Your Highness, Chunfeng lost!" Li Chunfeng bowed to the ground, even his self-identification changed, and there was some sincere admiration on his face. He wanted people like them to truly admire him, unless he could overwhelm the other party in knowledge, and  Li Min did exactly this.

    "Haha, Taoist priest Li doesn't need to be polite. I just know these tricks. In terms of attainments in arithmetic, let alone Taoist priest, I guess even Yifan is much better than me." Li Min  What he said was all true, at least he wouldn't be able to calculate the movement of celestial bodies.

    "Your Highness is so humble!" Yuan Tiangang stroked his beard and said with a smile.  In the past, I had only heard others talk about Li Min, but when I saw him today, he really lived up to his reputation. It was really surprising that he had such attainments in arithmetic.

    "Your Highness, Chunfeng admits defeat. I just don't know what the two problems you mentioned are. If even Your Highness can't solve them, then Chunfeng may not be able to help." Li Chunfeng said with a look of shame. In the past, he only  I thought I was unparalleled in learning, but only today did I know what it means to be someone who is different from others.

    "Haha, Brother Chunfeng, calling him Your Highness is too foreign. From now on, you and Taoist Yuan will call me Liulang. People who are close to me will call me that anyway." Li Min was not in a hurry to tell the two questions.  , because these two problems cannot be solved in a day or two, and Li Chunfeng will be very busy in the future.

    "Okay, okay! I also think it's troublesome to call you His Highness every day, but Liulang is better." Yuan Tiangang and Li Chunfeng haven't expressed their opinions yet, but Yifan said happily. She and Li Min talked very well, and she has a carefree temperament.  , in my heart, I never regarded Li Min as the King of Qi, but she still called Li Min as His Highness in front of others, otherwise her father Zhao Fu would be very unhappy.  Yuan Tiangang and Li Chunfeng were both outsiders and didn't care about the title. In addition, Yifan agreed, so they nodded in agreement.

    "Okay, let's talk about these two problems. In fact, the first one is okay and not very complicated. The second one is closely related to the first one, but it is a bit troublesome to solve."

    Hearing Li Min finally start to talk about the two mysterious problems, Li Chunfeng and the other two people immediately listened attentively, while Zhao Fu next to them had a sleepy expression. After all, from the perspective of a layman like him, these  Stuff is just so boring.

    After looking at the serious expressions of the three people, Li Min sorted out his thoughts, and then said: "Everyone must know that the land we live in, including the surrounding oceans, are all on a sphere!" After hearing this, the three people were furious.  Nodding, even Li Shimin¡¯s amateur astronomy loveIt¡¯s a problem that everyone knows, let alone the three experts in front of me.

    "Okay, since it is a sphere, then it brings us a positioning problem. If it is on land, it is okay, there are mountains and rivers for reference, but if it is on the endless sea, how should we know where we are?  Where is the direction?" Li Min asked step by step.

    "This" Li Chunfeng and Yuan Tiangang were silent for a while after hearing Li Min's question. They used to live on land most of the time and rarely went to sea, and they had never thought about this problem.

    Li Min waited for a while. Although the three people in front of him were all extremely intelligent people, they could not think of any good solution for a while, so he said again: "If you want to solve this problem, you must introduce Jingwei's method  Concept, the so-called horizontal lines are latitude and vertical lines are longitude. I named the ball we live in the earth, and the longitude and latitude are the lines drawn on the earth"

    Li Min slowly explained what he knew about latitude and longitude. Although it was only a foundation, and there were even some gaps and errors in some places, for Li Chunfeng and the other three, it was like opening a new door. Not only was it very  I almost understood the meaning of latitude and longitude, and even thought of other knowledge about latitude and longitude based on Li Min's explanation.

    "Your Highness is really capable of what ordinary people cannot do, I am so impressed!" After listening to Li Min's words, Yuan Tiangang was the first to stand up and salute, followed closely by Li Chunfeng. Although Yifan did not salute Li Min, he was naughty.  Winking at him was a compliment to Li Min for his erudition.

    "Haha, this is just the kid's random thoughts when he is free. There must be many fallacies, but it made the Taoist priest laugh." Li Min's face has been trained to be indestructible, and his expression will not change at all when he plagiarizes.

    "When Your Highness talks about the concept of longitude and latitude, you want me to help His Highness complete this knowledge?" Li Chunfeng's eyes lit up and he asked eagerly.

    "Haha, Brother Chunfeng is really good. He guessed the key right away." Li Min said with a smile. Professional knowledge should be left to professionals. He only needs to make a start and point in a direction, and someone will naturally help to supplement it. After all,  Datang is so big, are we still worried about the lack of available talents?

    "Don't worry, Your Highness, as long as Chunfeng is given some time, he will sort out all the relevant knowledge." After receiving Li Min's affirmative answer, Li Chunfeng immediately became excited. Although longitude and latitude are just a concept, its meaning is extremely unusual. If  Not surprisingly, it is definitely a beautiful thing that will last forever.  Although Li Chunfeng is not greedy for money and sex, he attaches great importance to the word "name", otherwise he would not be an official.

    "Brother Chunfeng, just sorting it out is not enough. I also want to build an observatory in Chang'an, just outside Chang'an City, on the extension of Zhuque Street. Then the longitude passing through Zhuque Street and the observatory will be named the prime meridian.  It is the zero-degree longitude, and all the longitudes on the earth start from this! And this matter will have to wait until you return to Chang'an to personally supervise the construction. As for the funds, I, Prince Qi, will come from the palace."

    Li Min said ambitiously that the Prime Meridian in the previous life was located in the United Kingdom, which was a witness to the glorious period of the British Empire.  Now Li Min wants to set the meridian at Zhuque Street in the Tang Dynasty. This street also happens to run north-south. It can be regarded as a destiny of its own. As long as it is there, no one will forget the glory of the Tang Dynasty.

    "What a great idea!" Li Chunfeng and Yuan Tiangang clapped their hands together and praised loudly. Li Chunfeng thought about it and suddenly smiled, "Your Highness, in fact, you don't need to contribute at all. If I report this matter to His Majesty, with His Majesty's temper,  They should be very happy to fund the construction of this observatory."

    When Li Min heard Li Chunfeng's words, the two looked at each other with great understanding, and then laughed.  Indeed, with Li Shimin's eagerness for success, wouldn't it be strange that he doesn't rush to do something that can leave a name for future generations?

    "The concept of longitude and latitude is indeed very good, but there is still a very critical question, that is, how do we know the longitude and latitude of where we are?" At this moment, the smart Yifan suddenly raised a difficult problem.

    "Yes, as Liulang said just now, it's fine on land, with mountains and rivers as reference points, but if you're on the vast sea, these reference points are gone, unless" Yuan Tiangang heard Yifan's words  He agreed with the problem at first, but as his thinking progressed, he suddenly thought of a solution, and his eyes immediately showed a trace of ecstasy.

    "Haha~, unless we use the sun, moon and stars as a reference." Li Chunfeng took over the master's words and went on to say that with their intelligence, as long as Li Min raised his head, they could immediately come up with subsequent solutions.

    "But if you want to use the sun, moon and stars as a reference to determine your longitude and latitude, you must be proficient in astronomy and arithmetic. There are not many such people in the Tang Dynasty. If you want to have one on every ship, it will be really difficult.  It¡¯s unrealistic.¡± After the masterAfter being reminded by senior brother, Yifan also woke up and thought of a way to determine the direction through calculation, but then he thought of a very practical difficulty.

    Listening to their discussion, Li Min was extremely surprised. These three people were indeed rare talents in the Tang Dynasty. They had already thought of the second question before he could even ask it.  (To be continued)

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