"Okay, since Your Highness is so sure, I will be arbitrage!" Li Chunfeng agreed without thinking. First, he did not believe that Li Yan could have any simplified methods, and second, even if he lost, he would not suffer any loss.

Instead, he knew a way to simplify mathology. As for the two mathology and astronomy problems that Li Yan mentioned, he ignored them even more.

Li Yan and Li Chunfeng's bet attracted Yuan Tiangang and Yifan, but Zhao Fu had no interest in these calculations. It was just that Li Yan, who was concerned about his immediate boss, could only force himself to accompany him.

"Okay, happy!" Li Yan immediately shouted happily when he saw the other party being trapped, then took the paper and pen 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 brand new set of numerical symbols to replace Chinese characters…”

Li Yan used terrible calligraphy to write out all Chinese characters from one to ten, and wrote the corresponding Arabic numerals below, and also wrote out the symbols of addition, subtraction, multiplication, division, etc., and then explained them 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, so they can understand it at first.

Then Li Yan took the binary first equation that Yifan just made as an example, substituted two unknown numbers x and y, listed the two equations, and after eliminating the number, one of the values ​​was obtained, and the second value would naturally come out.

.The whole thing was verified, but it was only three or four lines, and the whole time was less than a minute. This was like a miracle for Li Chunfeng and the others.

"This...this...this is simply incredible!" Li Chunfeng and Yuan Tiangang were still shocked. Yifan said in surprise first, and then ignored the others. He took a piece of paper and said Li Yan just now

The method was to try to test other questions, which was a bit awkward at the beginning, but with Li Yan's guidance, he quickly became proficient. In a short while, he found out that all the questions on the paper were solved.

At this time, Li Chunfeng and Yuan Tiangang finally woke up. Seeing Yifan's actions, they couldn't help but feel itchy, and they personally tried the calculations of these numerical symbols. As a result, they had a deeper understanding of these simple and convenient calculation methods.

I experienced it. The eyes that looked at Li Yan for a moment also changed a little different.

"Your Highness, Chunfeng lost!" Li Chunfeng bowed to the ground, even his claim changed, and his face showed a little sincere admiration. He wanted people like them to truly admire him, unless they could overwhelm the other party in their knowledge.

Li Yan did this.

"Haha, Master Li doesn't have to be too polite. I just know these tricks. In terms of my achievements in mathematics, let alone Master Taoist, I guess even Yifan is much better than me." Li Yan

All he told is the truth, at least he would not be able to calculate the movement of celestial bodies.

"Your Highness is so humble!" Yuan Tiangang smiled. He used to only hear others telling him how Li Yan was. When he saw him today, he was really well-known. He actually had such achievements in mathematics. It was really surprising.

"Your Highness, Chunfeng admits the gambling and accepts defeat. I just don't know what the two problems you mentioned are. If even Your Highness can't solve them, Chunfeng may not be able to help much." Li Chunfeng said with a shameful look on his face.

I thought I was unparalleled in my studies, but today I realized what it means to be outsiders.

"Haha, Brother Chunfeng, calling Your Highness seems too flirtatious. From now on, you and Master Yuan will call me Liulang. Anyway, those who are close to me call me that." Li Yan was not in a hurry to tell the two questions.

Because these two problems cannot be understood in a day or two, Li Chunfeng will be very busy in the future.

"Okay, okay! I also think it's troublesome to call you Your Highness every day, but Liu Lang sounds nice." Before Yuan Tiangang and Li Chunfeng had expressed their opinions, Yifan said happily. She and Li Yan had a very talkative relationship with each other, and they were careless again.

, I never thought Li Yan was the King of Qi in my heart, but I still called Li Yan the Lord in front of others, otherwise her father Zhao Fu would be very unhappy. Yuan Tiangang and Li Chunfeng were both

The people outside the square didn't care about the title, and Yifan agreed, so they nodded and said yes.

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

Hearing that Li Yan finally began to talk about the two mysterious problems, Li Chunfeng and the other two immediately listened attentively, while Zhao Fu next to him had a drowsy expression. After all, in the eyes of him, these things were

Things are simply boring.

After looking at the serious performance of the three of them, Li Yan sorted out his thoughts, and then said: "I believe everyone knows that the land we live in, including the surrounding ocean, are all on a sphere!" After hearing this, the three of them were very excited.

Nodding, even amateur astronomy enthusiasts like Li Shimin know about it, let alone the three experts in front of him.

"Okay, since it's a sphere, it brings us a problem of positioning. If it's okay on land, there are mountains, rivers and rivers to refer to, but if it's on the endless sea, how should we know what we are in

Where is the direction?" Li Yan asked step by step.

"This..." When Li Yan's question was heard, Li Chunfeng and Yuan Tiangang were silent. They lived on land most of their time before, rarely went to sea, and never thought about this problem.

Li Yan waited for a while. Although the three people in front of him were all extremely talented, they could never think of any good solution for a while. So he said again: "If you want to solve this problem, you must introduce Jingwei."

Concept, the so-called horizontal line is latitude and vertical line is the foremost. I named the ball we live in the earth, and the longitude and latitude are the lines drawn on the earth..."

Li Yan slowly explained what he knew about Jingwei. Although it was just a foundation, and there were even some missing and errors in some places, for Li Chunfeng and the other two, it was like opening a brand new door, not only very

I almost understood the meaning of Jingwei, and even learned from Li Yan's explanation, I learned from it some other knowledge about Jingwei.

"Your Highness is really something that ordinary people can't do, I am impressed!" After hearing Li Yan's speech, Yuan Tiangang was the first to stand up and salute, and Li Chunfeng followed closely behind. Although Yifan did not salute Li Yan, he was naughty.

Blinking at him was a compliment to Li Yan's knowledge.

"Haha, this is just a random thought when a boy is fine. There must be many fallacies, which makes the Taoist priest laugh." Li Yan's face had become indestructible, and his expression did not change at all when he plagiarized.

"Your Highness talks about the concept of this qualities. Do you want me to help you complete this knowledge?" Li Chunfeng asked with an anxious look on his face.

"Haha, Brother Chunfeng is really amazing, he guessed the key at once." Li Yan smiled. He still gave his professional knowledge to professional talents. As long as he started one head and pointed another direction, someone would naturally help him supplement it. After all,

The Tang Dynasty is so big, are you still afraid of lacking available talents?

"Don't worry, your highness, as long as you give Chunfeng a while, you will definitely sort out the relevant knowledge." After Li Yan's affirmative answer, Li Chunfeng immediately became excited. Although Jingwei is just a concept, its significance is extremely unusual.

If nothing unexpected happens, it is definitely a beautiful thing that can be famous for all eternity. Although Li Chunfeng is not greedy for money and sex, he attaches great importance to the word "fame", otherwise he would not have become an official.

"Brother Chunfeng, it's not enough to sort it out. I'm going to build an observatory in Chang'an, just outside Chang'an City, on the extension line of Zhuque Street, and then the meridian line passing Zhuque Street and the observatory is named Benchu ​​Meridian.

It is the zero-degree meridian line, and all the meridian lines on the earth begin! And this matter will be done when you return to Chang'an and personally supervise the construction. As for the funds, it will be provided by my Prince Qi's Mansion."

Li Yan said ambitiously that the prime meridian in his previous life was located in Britain, which was a witness to the glorious period of the British Empire. Now Li Yan is going to set the meridian on the Zhuque Street of the Tang Dynasty. This street happens to be north-south, and it is also considered a darkness.

There is a destiny in the underworld, and as long as it is there, no one will forget the glory of the Tang Dynasty.

"Good idea!" Li Chunfeng and Yuan Tiangang clapped and praised loudly, and Li Chunfeng thought about it and suddenly laughed, "Your Highness, you don't need to invest at all. If I report this to Your Majesty, with Your Majesty's temper,

I should be very happy to allocate funds to build this observatory.”

When Li Yan heard Li Chunfeng's words, the two looked at each other tacitly and then laughed. Indeed, with Li Shimin's temper of being very fond of merit, it would be strange if he didn't rush to do such things that could leave a name for later generations.

What's more?

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

"Yes, just like Liulang, you said just now. It's okay on land, there are reference objects such as mountains, rivers, etc., but if it is on the vast ocean, then these reference objects will be gone, unless..." Yuan Tiangang heard Yifan's

I agreed with the problem at first, but as my thinking progressed, I suddenly thought of a solution and my eyes immediately showed a hint of ecstasy.

"Haha~, unless you use the sun, moon, stars as a reference." Li Chunfeng took the words of his master and said next. With their intelligence, as long as Li Yan takes a head, they can immediately come up with a subsequent solution.

"But if you use the sun, moon and stars as references, if you want to determine the longitude and longitude of your life, you must be proficient in astronomy and mathematics. There are not many such people in the Tang Dynasty. If you want to have one on every sea boat, it is really

It is unrealistic." After reminding from the master and senior brother, Yifan also woke up and thought of a way to determine the direction through calculations. But then he thought of a very practical difficulty.

Listening to their discussion, Li Yan was extremely surprised. These three people were indeed the rare talents in the Tang Dynasty. Before he could even say the second question, they had already thought of it. (To be continued)
Chapter completed!