"The old man is Xu Yue, Xu Gonghe." After the elder scribe bowed to Cai Ji, he modestly corrected, "However, the "Dry Elephant Calendar" was made by the family master Yuan Zhuogong, and the prince of the palace is afraid that it will be done." ”

Cai Ji saw that the other party was really Xu Yue, and mentioned Yuan Zhuogong by the way, and his eyes subconsciously lit up. It must be known that the Yuan Zhuo Gong mentioned by Xu Yue was a famous astronomer and mathematician in the late Han Dynasty - Liu Hong. Liu Hong was born in a clan, and he was a group of books since he was a child, and he was appointed when he was about thirty years old. After that, Liu Hong spent more than ten years, together with Cai Yong and others, to determine the position of the sun between the stars during the 24 solar terms, the degree distance between the sun and the declination of the celestial sphere, the shadow length of the sun in the middle of the afternoon, the length of day and night, and the value of the 28 degrees in the south of the sky at dusk. These observations were tabulated and included in the Eastern Han Dynasty's Four-Minute Calendar. However, Liu Hong was not satisfied. After realizing that the Eastern Han Dynasty's "Four-Minute Calendar" was inaccurate, he began to calculate and improve it with reference to the calendars of previous dynasties, and then compiled China's first calendar, the "Qianxiang Calendar".

As for the reason why Cai Ji said that Xu Yue compiled the "Dry Elephant Calendar". It was because Xu Yue was Liu Hong's successor, and after Liu Hong's death, he continued to devote himself to studying the calendars such as obscurity, Shuo, strings, hope, and the eclipse of the sun and the moon, until he perfected the "Qianxiang Calendar" and taught it to Kan Ze, the Chinese book of Eastern Wu, so that the "Qianxiang Calendar" could be put into practical use. In addition, Cai Ji remembered that Liu Hong should have passed away in the early years of Jian'an.

However, hearing Xu Yue's answer at this moment, Cai Ji still asked the other party with the mentality of trying it out, "Yuan Zhuogong has also arrived in Donglai?" ”

"Don't hide it from Cai Fujun, the family teacher died a few months ago." Xu Yue hesitated for a moment and choked up,

"Yuan Zhuogong has died?" When Cai Ji heard that Liu Hong had indeed passed away, he also lamented it, "It's a pity that I couldn't ask Yuan Zhuogong for advice. ”

"It's a pity that Yuan Zhuogong didn't have the opportunity to see Cai Fujun." Xu Yue said with a relative.

Cai Ji couldn't help but be surprised when he heard Xu Yue sigh like this, "Where did Gonghe say this?" ”

But at this time, Xu Yue took out a roll of bamboo slips from his sleeve and asked Cai Jitan, "This book is compiled by Cai Fujun?" ”

Cai Ji fixed his eyes and saw that the scroll in Xu Yue's hand was a mathematics textbook written for the senior students of the Lecture and Martial Arts Hall. Could it be that this textbook frightened the astronomer and mathematician of the late Han Dynasty in front of him? In other words, Xu Yue and Liu Hong were not only proficient in astronomy, but also had a deep understanding of mathematics. Xu Yue is the author of the "Records of Mathematics" and "The Use of Arithmetic" mentioned by Duan Zhi earlier. Liu Hong is the author of China's first mathematical monograph, Nine Chapters of Arithmetic. Being favored by the patriarch of Chinese mathematics, Cai Ji was flattered, but also felt a little puzzled. Because although this book is advanced mathematics, it only deals with the four arithmetic operations and the basic plane geometry. And these contents are also described in Liu Hong's "Nine Chapters of Arithmetic". Therefore, the content in the textbook is not at all ahead of its time.

Thinking of this, Cai Ji couldn't help but ask Xu Yue, "This is a textbook compiled by this mansion for the children of the Martial Arts Hall. But what's the problem? ”

"No, no. The old man just wants to ask, where did this kind of algorithm come from? The old man has never seen it. Xu Yue, who was actually nearly fifty years old, pointed to a vertical calculation example on the scroll like a studious child.

This is a vertical calculation method, that is, it is calculated by position, unit to unit, ten to ten, hundred to hundred, and so on. It's more troublesome than abacus. But the victory lies in the clear process, and it is found with the calculation. It was learned from a day of cannibalism. Cai Ji replied half-truthfully. In her opinion, ancient Chinese arithmetic has always focused only on results, not on the process, and it would not be a good thing if Xu Yue's attention to mathematical calculus and reasoning could be aroused.

"Big cannibal? No wonder. Well, the principle of this method is similar to that of abacus, and it is simple and clear, and it is really a wonderful method. Xu Yue twisted his beard and said.

Duan Zhi on the side asked Cai Ji even more curiously, "Are all the princes of the mansion taught by that big cannibal?" ”

"That big cannibal is a traveling businessman, and after teaching the sisters and brothers in this mansion arithmetic for half a year, he left Caifu and didn't know where to go." Cai Ji lied with a weak heart, and on the other hand, he sighed in his heart that it was really a foreign monk who was good at chanting.

Xu Yue'er heard that Cai Ji had learned arithmetic from the Great Cannibal, and immediately raised his eyebrows, turned back to a young scribe standing behind him, and excitedly announced, "Wen Rui, the old man will not go to Yangzhou with you. The old man wants to stay in his hometown Donglai and ask Cai Fujun for teaching Dashi arithmetic. ”

When the young scribe known as Wen Rui heard that Xu Yue was determined to stay in Donglai, he immediately stepped forward and respectfully bowed his hand to Xu Yue, "As long as Gonghe Gong can study with peace of mind, I will rest assured." ”

And Cai Ji next to him saw that this person was extraordinary, and he didn't seem to be an ordinary humble person, so he asked Duan Zhi, "Who is this?" ”

Duan Zhi was asked by Cai Ji, and then realized that there was another person who had not been introduced. So he hurriedly responded with his hand, "This is the nephew of Zhang Zibu, a famous man in Pengcheng, Zhang Jin, Zhang Wenrui." ”

Pengcheng Zhang Zibu? Although Zhang Zhao had long heard that the famous people of the late Han Dynasty were more or less related to each other, the successive surprises still made Cai Ji have to sigh that the world of the famous family is really small. As long as you have the ability to step into this circle, you will inevitably meet all kinds of celebrities. Just like the young man in front of him, although he is only an unknown nephew of Zhang Zhao, he may be able to catch up with the family of Soochow through the guò line one day. There's nothing more than that.

And just when Cai Ji was thinking about how to have more connections and more roads. Zhang Jin saw that Duan Zhi's old bottom was exposed as soon as he came up, so it was not good to continue to keep a low profile. I saw him turn around and say to Cai Jishi, "Zhang Jin, a native of Pengcheng, has seen Cai Fujun." ”

"Lang Jun, this is the first time to come to Donglai, right? There are a lot of words on the no fiction network," Cai Ji asked with a greeting.

"Huifujun, it is indeed the first time to come to Donglai. I never thought that there would be such a peaceful place as Donglai in the Northland, no wonder the Gonghe Guild decided to stay and study. Zhang Jin said half-flattering and half-emotional. Yes, since the Yellow Turban Rebellion, a large number of celebrities and talents in the Central Plains have moved to the south to escape the war. One of the more famous is the Zhuge family in Langya, Xuzhou. Historically, Xu Yue also completed many of his works in the state of Wu. It can be said that the Three Kingdoms at the end of the Han Dynasty was a turbulent era of wars between princes on the one hand, and a prosperous period of cultural exchanges between the north and south of China on the other hand. Those families of the Central Plains who moved south brought the advanced doctrines of the Central Plains and the fashion of learning to the originally wild south. The tradition of producing talented people in Jiangnan began around this period. Because of this, Zhang Jin originally thought that going north to pick up Xu Yue and going south this time would be very smooth. Who would have thought that a letter from Duan Zhi's guy would disrupt the plan. Thinking that he would be criticized by his uncle in the future, Zhang Jin's stomach began to ache faintly.

Regardless of Zhang Jin's secret sigh in his heart, he ran for nothing. On the other side, Cai Ji warmly invited him, "Even so, Zhang Langjun will stay in Huangxian for more time, and learn more about the customs of Donglai." ”

Cai Ji's invitation was not just a simple politeness, but really thinking about Zhang Jin's safety. In the opinion of Cai Ji, who is familiar with history, since Lu Bu has withdrawn his troops to aid Liu Bei, most of the "Yuanmen Halberd Shooting" incident will still occur according to historical facts, and then the little overlord Sun Ce will also be separated from Yuan Shuxiang during this period, and will start to set up his own portal to attack Wu Yue. If Zhang Jin leaves for the south at this time, I am afraid that he will just catch up with the scuffle set off by Sun Ce.

Although Zhang Jin didn't know that Cai Ji was thinking about his safety, seeing that the prince of Donglai was so kindly invited, he naturally couldn't dismiss people's face. So Zhang Jin immediately put aside the "stomach pain" and replied loudly, "Then it is better to be respectful than to obey your fate." ”

After that, Zhang Jin respectfully made a bow to Cai Ji. But at the moment when he leaned over, the corner of his eye suddenly swept into a familiar figure in the crowd. A figure that he thought was unlikely to appear in Donglai. But when he straightened up to take a look, the figure disappeared again.

Am I dazzled? And just when Zhang Jin was secretly wondering, everyone had already gathered around Cai Ji and others to beat gongs and drums into the city. Seeing this, Zhang Jin had no choice but to put aside the doubts in his heart and follow the trend. It's just that Zhang Jin didn't know that the figure he saw appeared in front of the Donglai Taishou Mansion a few days later.

"Stand there?"

The two bearded soldiers in front of the Taishou Mansion drank a suspicious man. The reason why Jun Han felt that this person was suspicious was not because he behaved sneakily in front of the Taishou Mansion, but because he was dressed strangely. It must be known that at the end of summer and early autumn, most people have not completely faded their summer clothes, but the man in front of him is not only tightly wrapped in a black robe, but most importantly, his face is covered with a black cloth. No, his face was covered with a cloth, and he was still in broad daylight, at the gate of the dignified Donglai Taishou Mansion.

This son wants to rob the Taishou Mansion? This is probably a question shared by the two military men and all passers-by.

However, the masked man did not shout, took out his knives, guns and sticks, and caused discord. And Xinbu stepped forward and arched his hand at the two military men, "I'm tired of reporting, the disciples of Xiangyang Lumen came to apply for a job in Wutang." ”

"Hmph, the person who hides his head and shows his tail actually falsely claims to be applying," one of the military men who had read some books refuted loudly. The other soldier cooperated with the spear.

Unexpectedly, the masked man seemed to have been stimulated suddenly, and immediately raised his eyebrows and asked in a loud voice, "The law of the Han Dynasty stipulates that you must not wear a face towel when you go out?" Wearing a face towel is to hide your head and show your tail, but if you are infected with a disease, you can't stand the wind? What if there is a wound on the lower face? You and others said that they wanted to recruit talents, but the result was still to judge people by their appearance."

was so troubled by the masked man, and many onlookers soon gathered at the gate of the Taishou Mansion. People pointed at the man's strange outfit while having to admit that the strange man had a point. So immediately, some people with good deeds coaxed, "Yes, why can't you wear a face towel?" ”

And just when there were more and more people coaxing, a crisp female voice suddenly came from the crowd, "Dahan Law really doesn't stipulate that you can't wear a face towel." ”

As the woman's words fell, the crowd that had been noisy suddenly fell silent. Because people in Huang County will use women with this tone, there is only one person in Donglai. No, immediately afterwards, two teams of freshly dressed and bright-armored sergeants opened a way in the crowd, and the young woman standing in the middle was Cai Anzhen, the Taishou of Donglai.

But seeing Cai Ji at this time, he looked at the strangely dressed man in front of him, and on the other hand, he stepped forward and bowed to the other party, "This mansion is Donglai Taishou Cai Ji." But let's talk about applying for a job in Wutang? ”

The masked man faced Cai Ji's scrutiny, and suddenly lost his previous arrogance, and instead lowered his head and answered vaguely, "Hmm." ”

On the contrary, Cai Ji didn't mind the commotion caused by the man before, and generously and enthusiastically raised his hand to the other party and invited, "Please." ”

So, under the curious eyes of the people, the masked man walked into the Taishou Mansion side by side with Cai Ji. Since the man claimed to be applying for the lecture hall, Cai Ji naturally took him straight to the small courtyard of the lecture hall. At this time, the class is in class, so the sound of children reading aloud and the sound of teachers lecturing can be heard from time to time in the small courtyard. Cai Ji and the man sat down as guests of honor in the teacher's rest room.

"If it's inconvenient, wear a face towel. Anyway, this government is based on knowledge, not appearance. Cai Ji raised his hand to stop the man who was about to take off his face towel. In Cai Ji's opinion, in troubled times, it is not a big deal to have scars on people's faces. Even influenced by later film and television dramas, Cai Ji also believes that a moderate amount of scars on a man's face can be regarded as a sign of sexiness. However, after a gap of 1,800 years, the aesthetics of the Eastern Han Dynasty are different from those of later generations. Just like Cao Cao's general Xiahoudun, because of his one-eyedness, he was highly sought after by the unparalleled female players of the Three Kingdoms in later generations, but he himself rarely even looked in the mirror because of the one-eyed thing. So if the appearance will involve the other party's self-esteem, then it is better for others to be accommodating.

Sure enough, when the masked man heard Cai Ji say this, he was stunned at first, and then he also dispelled the idea of taking off the face towel, and instead took out a yellowed cloth from his sleeve and handed it to Cai Jidao, "I have answered this Han Xin's order, please take a look at it." ”

Cai Ji took the cloth and took a look, it turned out to be a recruitment notice that was released. It seems that it has been a few days, but what Cai Ji cares about more is the densely written steps behind the poster. To be honest, this is the most detailed and serious answer Cai Ji has seen so far. Regardless of the other party's dress and appearance, it is for this seriousness, Cai Ji has also identified with the staff of the applicant in front of him.

So, after Cai Ji carefully folded the notice in front of the other party, he then asked him solemnly, "Dacai." How do you dare to ask what to call it? ”

However, before the masked man could answer, he suddenly saw Guo Jia with the smell of wine all over his body, and he swayed in and asked, "I heard that a masked beauty is visiting." What about beauties? Well, there's a masked. Come, come, come, don't be shy. ”

After that, Guo Jia ignored the other party's surprised gaze, and directly reached out to pick up the face towel on the man's face. Cai Ji, who didn't have time to stop it, suddenly exclaimed.

"Bonghyo, don't"

Forgive me, everyone, Liu Ding is in urgent need of mature men here~~~ So some Zhengtai (∩_∩) ha

A certain man finally came out after a long time, and the bird ~~~ no nonsense ~~~ asked for a ticket~~~

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