“…… This is the so-called binary equation, it is very easy to use it to solve the problem of chickens and rabbits in the same cage, you can try it according to the method I just talked about when you go back! Li Jie stood on the podium and finished the lecture to Zhu Yunxi and the others below, and then took a sip of water to moisten his throat.

But as soon as Li Jie's words fell, Guo Zhenglin immediately stood up and said loudly: "Li Banyu, the main class is over, I have an astronomical question I want to ask!" ”

Hearing Guo Zhenglin ask for knowledge of astronomy, the people below the class were all shocked, except for Zhu Yunxi, these people who listened to the lecture were all officials of Qin Tianjian, and they were of different ages, some of them may be the same age as Li Jie, and some of them were already gray-haired, but they all had their own specializations in astronomy and geography.

"Brother Guo is polite, if there are any problems, we can discuss them together!" Li Jie also replied with a smile.

The last time Li Jie promised Yuan Jianzheng and others, these people came to listen to his lectures, and after he finished the lecture, they would discuss some other issues, and Li Jie was also happy to communicate with the scholars of this era, so he tried his best to answer the questions they raised.

But without waiting for Guo Zhenglin to answer, he saw Ma Hama also stand up and preemptively said: "Li Banyu, this question is actually an argument between me and Brother Guo, we have proved that the earth is like a ball before, and in my opinion, outside the earth, there are moon days, Mercury days, Venus days, solar days, and Mars days, but Brother Guo thinks that Mars should be before the sun, and none of us can convince anyone, so I also ask Brother Li to uphold justice!" ”

When Li Jie heard this, he immediately understood that Guo Zhenglin was a supporter of the Central Plains Armillary Theory, while Ma Hama was a supporter of the Western Geocentric Theory, and the two theories were similar, both believed that the earth was in the center and did not move, while other celestial bodies rotated around the earth along a certain orbit, but they had different views on the order of these celestial bodies.

"Brother Li, my family has been observing the sky for generations, and the recorded books can fill several rooms, and according to our observations, we found that Mars sometimes blocks the sun, so Mars must be closer to us than the sun!" Guo Zhenglin expressed his opinion loudly at this time, and his opinion was evidenced by family records.

"Ancient Greek scholars have long discovered that celestial bodies are at different distances from us at different times, so their orbits sometimes intersect, and Mars may be in front of the Sun at certain times, but in general, it is still relatively far away from the Earth!" Ma Hama didn't give in at all.

Although Ma Hama and Guo Zhenglin are friends, they both have their own insistence on academics, so no one can convince anyone of this disagreement, so they asked Li Jie for verification, after all, during this time, Li Jie has used his rich knowledge to impress the entire Qin Tianjian, and even Yuan Jianzheng felt guilty and wanted to resign and give up the position of the supervisor to Li Jie.

Li Jie felt like he couldn't laugh or cry when he heard the argument between the two, because as long as the future generations knew a little about astronomy, they would know that both of them were wrong, because their argument was that the earth remained immobile, which was wrong, and of course all the things deduced from the arguments were all wrong.

Thinking of this, Li Jie decided to help them, so he coughed dryly and reminded: "What you said is right but not right, in your thoughts, the earth is motionless in the center, but have you ever thought about what if the earth is moving around other celestial bodies?" ”

As soon as Li Jie's words came out, there was a strange silence in the room, and Ma Hama and Guo Zhenglin also opened their mouths in shock, then glanced at each other, and then looked at a person in the corner of the room with the rest of Qin Tianjian.

Li Jie thought that as soon as his words came out, Ma Hama and Guo Zhenglin would argue with him after being shocked, but he didn't expect that they didn't look at him, but looked at a person in the corner, which made him look curious.

I saw a somewhat down-and-out middle-aged man sitting in the corner, wearing a low-level green official uniform, although there were not many wrinkles on his face, his hair was already half white, and his beard was not taken care of, looking sloppy and unsatisfactory.

The middle-aged man in the corner also widened his eyes at this time, staring at Li Jie in disbelief, he never thought that there were still people in this world who supported his doctrine!

Li ...... Do you really think that the earth under our feet is not fixed? I saw that the middle-aged man also stood up excitedly at this time, and even his voice trembled a little.

"Uh~, yes, I don't think the Earth is stationary, but orbits other celestial bodies!" Li Jie couldn't help but hesitate when he saw the other party's excited appearance, and then spoke.

"Hah...... Ha ha...... Hahahaha~" I saw that the middle-aged man laughed when he heard Li Jie's answer, and he was a little sad at first, but the more he laughed, the happier he became, as if he wanted to laugh out all the depression in his life. 、

Li Jie was also confused at this time, this middle-aged man just felt familiar, he should have come to listen to his classes often, but he didn't know the other party, let alone why he was so excited?

"Brother Li, this is Wang Yue Wang Sichen, he proposed that the earth revolve around the sun more than ten years ago, but the prison did not agree with his statement, and even thought it was a fallacy and heresy, but he was stubborn, so he was not very popular in prison." At this time, Guo Zhenglin came to Li Jie's side and whispered.

Si Chen is a petty official from the ninth grade, which is considered the lowest grade official, only better than the scribe, and this Wang Sichen put forward a "crooked heresy" that is not recognized by others, so it is not surprising that his career is unsatisfactory.

When Li Jie heard this, he couldn't help but be in awe of this Wang Sichen, the other party was able to put forward the heliocentric theory, this is definitely a great progress in astronomy, but unfortunately there is no information about him in history, presumably he should be excluded by others, and the doctrine he wrote should not have been handed down.

"I didn't expect Wang Sichen to see the same as me, if I have time in the future, I will also ask Wang Sichen for advice or two!" Li Jie immediately saluted the other party.

"Li Ban is polite, don't dare to ask for advice, and the lower officials also have many questions to ask Li Ban for advice!" Wang Sichen returned the salute excitedly to Li Jie again.

After so many years of persistence, his doctrine has not been recognized by others, and sometimes even he himself is a little suspicious of himself, and now Li Jie's words have finally completely restored his self-confidence, and his waist has straightened all of a sudden, and his whole person's bearing has undergone some changes.

Guo Zhenglin, Ma Hama and the others looked at Wang Sichen with a slightly different gaze, because they had long been impressed by Li Jie, and they also attached great importance to the doctrine put forward by Li Jie.

It was not early, and Li Jie was also going to send Zhu Yunxi back to the palace, so he packed up his things, and said goodbye to that Wang Sichen before leaving the room.

As soon as Li Jie left, Wang Sichen was immediately surrounded by some officials of Qin Tianjian, who had only known that Wang Sichen adhered to a set of fallacies and heresies, but they had never understood them carefully, and today's Li Jie's words also made them extremely interested in Wang Sichen's doctrine.

"Li Banyu, is the earth under our feet really moving around other celestial bodies?" On the carriage back, Zhu Yunxi also asked in disbelief, after all, in his feeling, the ground under his feet has not moved, unless the earth dragon turns over, and there will be an earthquake.

"Your Highness, human feelings can sometimes be wrong, and movement is only a relative concept, not an absolute concept." Li Jie once again opened a small stove for Zhu Yunxi.

"I don't understand!" Zhu Yunxi can't understand what relative and absolute are?

Li Jie was very patient, and saw him stretch out his hand and point to the carriage and said again: "Your Highness, please look, for you, is this carriage moving?" ”

"Nope!" Zhu Yunxi shook his head.

"Very good, then Your Highness thinks about it again, for the pedestrians outside, is our car moving?" Li Jie induced again.

"Of course!" Zhu Yunxi nodded immediately, and then seemed to understand something, and immediately showed a contemplative look, and after a while, he raised his head and said, "I understand, the earth under my feet does not move, it is just for me, but if I stand on other celestial bodies, the earth is in motion!" ”

"Your Highness is really getting smarter!" Li Jie also smiled and praised when he heard this.

Through this period of getting along, Li Jie found that Zhu Yunxi is actually very smart, but he is sensitive by nature, for this kind of child, he can't blindly criticize education, but use encouraging methods to educate, but unfortunately Zhu Biao only knew blind criticism before, and the more he criticized, the more Zhu Yunxi felt inferior, and even under self-suggestion, even his originally smart brain became clumsy.

Hearing Li Jie's praise, Zhu Yunxi was a little embarrassed, but he liked this kind of praise very much, and even every time he praised it, he felt that he was closer to Li Jie, in his opinion, Li Jie was not only his quasi-brother-in-law, but also his most respected teacher!

"By the way, tomorrow is my birthday, are your sister's gifts ready?" Li Jie suddenly asked with a smile, he is now alone in the capital, although he has some relatives and friends, but sometimes he still feels lonely, so he is more concerned about Zhu Yuning, his fiancée.

"You should be ready, I saw her embroidering a handkerchief last time." Zhu Yunxi wasn't quite sure, but then he said again, "Tomorrow is your birthday, is it going to have a birthday banquet or something, and invite me to a big meal?" ”

"That's natural, I'll have a banquet at home tomorrow afternoon, and it's all dishes made by me, I guarantee you haven't eaten it!" Li Jie said very confidently in the end.

"You can also cook?" Zhu Yunxi was even more surprised when he heard this, in his eyes, Li Jie was proficient in astronomy, geography, arithmetic and history, but he never expected that he would even know how to cook, so what else in the world he couldn't do?

"Don't be surprised, the longer you spend with me, the more I'll find out how much more I have!" Li Jie said in a quiet tone, his face was raised forty-five degrees when he spoke, and if there was a little bright sunlight on his face, it would be even more enough to pretend to be a fan.