The surname Yu of Jiyang Waihuang is barely a famous family, and it is said that it is after the famous general Yu Xu of the Eastern Han Dynasty - Yu Yin is out of his family. This will be Ji Yuyao also has the Yu family, Pei Gai is the first time to hear of it...... But think about it again, where is Yu Tuo, a famous minister of Eastern Wu, from? Looks like it's a joke, right......

This Yu Zhongning is neither a big surname, but also a commoner, theoretically he should be in the way - it's not that Pei should look down on the Hanmen, but most of the current Hanmen disciples have a limited level, but the number is several times that of the family, if they all come to ask for a meeting, he is really overwhelmed - I don't know why it's on top?

asked Pei Fu, and Pei Fu reported with his hand: "Carry Wang Zhonglang's letter for him." ”

Pei should hear it, oh, it is the person recommended by the prince, it is really inconvenient to block the drive, and he immediately summoned Yu Xi to meet him.

The time is not big, Yu Zhongning bowed in, Pei should take a look, this person is thirty or forty years old, although the clothes are old, but quite neat, although the appearance is ordinary, but also spirited, especially the eyes are very positive, at a glance, he is not as treacherous as Wang Gong...... I had a bit of a good impression first. So he took the initiative to stand up and salute, and then waved his hand to sit down.

Pei should be this temper, no matter how low the other party's status is, as long as he is not absolutely disdainful, then since he is willing to meet him, I have to be amiable, and I can't show arrogance - the leader who has seen too many nostrils in the key previous life, he is always vigilant to himself, don't accidentally become that kind of goods.

Yu Xi from Wang Gong, all the way from Qingzhou to Guanzhong, on the one hand, in order to avoid the battlefield in the north of Yanzhou, so he went far away; On the other hand, he didn't have the idea of meeting Pei Gai urgently, and he had to stay for a few days to observe the stars for almost every 300 miles on the way, so he procrastinated, and arrived in Chang'an three days ago. After finding a place to settle down first, he took the name thorn and Wang Gong's handwritten letter to worship Pei Gai.

When he entered the hall and took a look, Da Sima actually took the initiative to stand up and salute himself, which frightened Yu Xi. Although he was once promoted as virtuous and was also recruited as a doctor, because he refused to go to the post, he is still a common man in cloth, and he has never been so courteous in front of an official. Zhuge Hui was the county guard of Huiji and forcibly called him to serve as Gongcao, which was also an order to send people to the door and indirectly; Yu Zhongning sometimes wonders, if Zhuge Daoming drove the grass house to open up, would he refuse him in one bite? I'm a soft-hearted person after all......

Who would have thought that in Chang'an's Great Sima Mansion, before Wang Gong's letter was handed over, the Great Sima would be able to get up and greet him-Have you ever heard of my name? However, I have no distant reputation, and I am good at astronomy and have abandoned the classics for a long time, and the great Sima Beiren is also, the probability of hearing of me is very low, because the fame leads to a different attitude, which is even more unreliable.

Quickly bowed, gave a big salute, and then sat down sideways, then he took out Wang Gong's letter from his sleeve and presented it with both hands. Pei Xiong happened to be by Pei Gai's side, so he took the role of an attendant, took the letter, and handed it to Pei Gai. Pei should unfold it and glance at ten lines, and he couldn't help but be surprised.

Wang Gongxin praised Yu Xi like a flower, saying that although this person is obsessed with stargazing and does not like mundane affairs, he is in the general trend of the world, and every time he has more insightful opinions, even I often have to ask him for advice, and I have benefited a lot. He hoped that Pei should be able to hire Yu Xi, and he would be able to make up for it; But at the same time, he also said that Yu Xi has no eunuch intentions, if he resolutely refuses to allow it, Ming Gong can ask him to watch the stars in Guanzhong as an excuse, try to keep it, as a friend of cloth.

Wang Gong just mentioned it casually, and did not focus on Yu Xi's preferences for stargazing, and his achievements—because he didn't understand it himself—Pei should have seen it, but he couldn't help but think a little. So he rolled up the letter, raised his head, smiled at Yuxi, and asked him: "Zhongning traveled thousands of miles from Qingzhou to Chang'an, and it was hard to pass on the book to the prince." ”

Yu Xi replied: "I am good at stargazing, but I want to travel all over the world, and observe the slight difference in the starry sky everywhere. "He is specifically explaining, I am not here to see you, even if it is to send a letter for Wang Gong, it is a convenient move, my whole mind is on the celestial phenomena, it is really not conducive to governing the country and the country, you must not be interested in hiring me - it is estimated that Wang Gong's letter is to recommend me to you, you don't believe it.

Pei Gai asked: "Zi Ci letter Zhongyun, Zhong Ning Tong classics, once interpreted "Mao Shiluo", annotated "Filial Piety", and "Zhilin" thirty articles, somehow interpreted the Confucian scriptures, and turned to the heavens? "Are you purely a hobby, or do you really want to delve into astronomy?

This question scratched Yu Xi's itch, and immediately replied: "I read the ancient chronicles, and knew that the early Han Dynasty followed the ancient six calendars, starting from the beginning of the morning glory with the winter solstice, and then making the "Taichu Calendar". In this westward move, Liu Zijun (Liu Xin) was vague and did not know his explanation. Because of my doubts, I looked at the stars and sought their roots, and I am now four years old. ”

- I've left behind the Confucian classics for 14 years, don't treat me as a dish!

To tell the truth about Yu Xi's words, Pei Gai didn't understand it at all, so he had to twist his beard in a fake way, thoughtfully, and asked casually: "However, I don't know if Zhong Ning's fourteen years of stargazing can be the reason?" ”

Yu Xi replied: "The winter solstice is one year old, which is shorter than the day of the week, so the winter solstice only moves westward every year - I name it 'precession'." ”

In fact, this is Yu Xi's discovery of the difference between the sidereal year and the return year, although Pei Gai also understands the difference, but he does not directly correspond to Yu Xi's words, he just suddenly found a familiar word - precession. What do you say, "precession" was invented by you...... No, you made it up? Then it looks like this Yu Zhongning has two brushes.

After thinking about it, he asked: "This world follows Wei's "Jingchu Calendar", which has been promulgated for nearly a hundred years, and I persuaded farmers in Guanzhong, but I felt that the four seasons may not be accurate, is it the reason for the 'precession'?" Do you have a calculation of the size of the precession? ”

Yu Xi nodded and said: "According to the record of "Yaodian", I know that the winter solstice is short and the stars are short, and now it is measured that in the east wall, in the past 2,700 years, it has retreated more than 50 degrees, so it should be more than 50 years old. ”

What "the days are short and the stars are in the Pleiades", what is "in the east wall", Pei Gai is completely confused, but he roughly understands that Yu Xi is based on the records of the stars on the winter solstice at that time in ancient books, and calculated that the "precession" is one degree in fifty years, which sounds quite reliable. But the question is, not to mention whether the "Yaodian" is really an ancient material, Di Yao is his person, and the specific era in which era he lived, even later generations have not been able to verify it, then the words of Confucianism are completely unbelievable!

No matter how correct the number is, this parameter is not reliable, can you get even a close to the correct answer?

simply ignored the astrological signs, but asked Yu Xi in a general way: "Zeqing thinks, what is the earth, what is the sky, where are the sun, the moon and the stars?" "If you tell me it's round, you'll be able to get out of here.

When Yu Xi heard this, he was stunned for a moment, and then replied: "In my opinion, the 'Hun Tian Theory' of Han Zhang Pingzi (Zhang Heng) and the 'Xuanye Theory' passed on by the secretary Xuan Meng are close to good. The sky is high and infinite, the earth is deep and immeasurable, and it doesn't matter how far it is. As for the sun, moon and stars, their light is laid out in nothingness, and they move like the tides of a river and sea. ”

Pei Gai smiled and asked: "According to Zhang Pingzi's 'Hun Tian Said', the clouds are like chickens, and the earth is like chickens in yellow' - both are yellow in chickens and oval, I often wonder, how does the earth resemble eggs?" Could you please help me? ”

Yu Xi thought for a while and replied: "According to what Zhang Pingzi said, it is just a metaphor, not necessarily that the earth is like an egg. It is true that the earth is not flat, and it is not possible to see the roots of the distant mountains without the mountains or mountains in the wilderness; I came from Huiji, and I often looked at the returning boat, and saw its sails first, and then its oars - it can be seen that the earth is really curved. Only whether it is like an egg, whether it is as Zhang Pingzi said, hanging in the water of the sky, I dare not say it......"

Pei Caixin said It's a pity, you have been able to accept "Hun Tian Said" and "Xuanye Said", but you can't go further...... But that's right, according to what Wang Gong said, this person has been working behind closed doors in Huiji, and in order to escape Zhuge Hui's call, he will go to Qingzhou to rely on Wang Gong, and this return to Chang'an is probably the first time in his life to cross the great longitude...... Only he lives in the corner of the sea, but he has already found that the earth has a curvature.

To remind Yu Xi, the earth is actually a ball...... But there are no strong arguments. After a while, my heart suddenly rose, and my heart said I'll just reveal something more mysterious to you!

So he asked Yu Xi: "If it is as 'Hun Tian Said', and what He Qing said, the five stars of the sun and moon are really hanging in the void, then why do they move?" ”

Yu Xi couldn't help but be dumbfounded, and said in his heart that Da Sima's thinking was really unexpected...... In the past, he also discussed his own cosmology with his friends—later known as "An Tianshuo"—and the other party's first reaction was: How can the sun, moon and stars hang in the void and not fall? I thought that Pei Da Sima would ask the same question, but unexpectedly asked what the sun and moon and the five stars rely on to run...... How should this be answered?

So he arched his hand and said: "I don't know, I still hope for the teachings of Da Sima." "You don't understand the ball back, do you?

Pei Cai smiled and stood up again, and Yu Xi also quickly left the table and got up. I saw Pei Gai walking down, three feet away, facing Yu Zhongning directly, and then kept this distance and circled around him. Yu Xi didn't understand what the other party meant at all - you can just look up and down when you look at people, why do you want to look at my ass...... I had to arch my hands and follow Pei Gai to turn around - after all, he turned his back to the nobleman, which was too disrespectful.

I heard Pei Gai say: "For example, Qing is the earth, and I am the sun and the moon, and I revolve around Qing." ”

Yu Xixin made it clear, it turned out that you were making an analogy - nodding your head and listening to the teachings.

Pei Gai suddenly laughed: "If this is not the main hall in the house, and there is nothing, it is as dark as the starry sky; I didn't do it on my own, but I turned around with the carriage and horse, but I didn't know that I was doing it, and I was doing it. Or in my opinion, it's actually Qing who is walking around me. ”

There is no need to beat the drum hard, Yu Xi heard this, and was stunned on the spot.

Some people are elm-headed, confused by fixed opinions, and do not think about more possibilities at all; But Yu Zhongning is different, through long-term observation of the starry sky, he gradually accepted the seemingly absurd two theories of "Hun Tian" and "Xuan Ye", as soon as his mind was opened, he naturally knew that it was difficult to truly explore the principles of heaven and earth only by daily experience. Therefore, Pei Gai made an analogy, and he understood that objects move in opposite directions, and it is completely possible to study the journey of the sun and the moon from a different angle.

What Da Sima means is that people believe that the sun and the moon revolve around the earth, so can you think the other way around, in fact, the earth revolves around the sun and moon - the other stars don't move much, so don't worry about it for the time being. This is naturally whimsical, but in the calculation of the orbits of the sun and moon stars, is it possible to get completely different values by changing the opposite idea? Comparing the two, it may be possible to find out where the formulas that were always wrong in the past are missing......

After being stunned for a while, he immediately took a deep look at Pei Cai: "I have inherited the teachings of the great Sima, and I am happy to benefit a lot, so I should retire." ”

Pei Cai observed his words and looks, and when he saw Yu Xi's frizziness scratching his ears and cheeks, he knew that he was busy going back to recalculate various astronomical parameters, and couldn't help but say: Go and calculate, if you can really calculate accurately, maybe you can explain the "heliocentric theory" in advance.

But he didn't let Yu Xi leave, but slowly sat down, Yu Zhongning had no choice but to sit down again. I heard Pei Gai ask: "The prince gave the real recommendation to Chang'an, but Yunqing has no eunuch intentions, only good stargazing - I don't know if I want to conquer Zhongning today, can I be willing to obey?" ”

Yu Xixin said it, and sure enough, he asked about it, and hurriedly refused: "As the prince said, there is no eunuch will, and the classics have not been governed for a long time, and there is no experience of the people, if you make up the number indiscriminately, you will definitely have the trust of the great Sima......"

Pei Gai interrupted him and said, "However, I have an important matter here, and I am afraid that Zhong Ning will not be able to do it." ”

Yu Xi was stunned when she heard this, and said in her heart, is there anything else I have to do? Since Da Sima is so polite and virtuous, if I have great hopes, it is inconvenient for me to refuse people thousands of miles away, so let's listen to what is going on first-"I am not sensitive, and I really have no talent, I don't know what Da Sima means when he is talking about important things......"

Pei Gai said: "As mentioned before, it has been nearly a hundred years since the "Jingchu Calendar" has been used, and according to Qing's calculations, the winter solstice will be biased twice, which will inevitably hinder it in the agricultural time. The predecessors made the calendar, and they didn't know the 'precession', but now that they know it, how can they not be revised because of this? Who can do this in Zhongning? ”

Pei should have wanted Yu Xi to revise the calendar, and as soon as these words came out, Yu Zhongning couldn't help but feel a little itchy. You must know that at that time, the main purpose of studying astronomy was to formulate a calendar to guide agricultural production, that is to say, the main application of astronomy was in the formulation of the calendar. Yu Xi is good at astronomy, and he must not want to end up with only a theory and calculation that few people can understand, and if he can revise the old calendar, or even formulate a new one, according to his new calculus, especially the influence of "precession", it is undoubtedly a very tempting thing.

After all, although Yu Xi has no idea of being an official, he is not interested in secular affairs, and he is purely a scholar, but he is a scholar who has studied the Confucian scriptures for enlightenment, and it is impossible to completely erase this heart of merit.

But this matter was too big, he didn't dare to accept it on the spot, but just asked Pei Gai: "Guanzhong Xingtai, you should not have the right to repair the calendar, Da Sima is in this life, and I think it is impossible to ...... the period."

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