After all, Yang Xiong has a friendship with the national teacher for decades, and those who are close to the building get the moon first, and the fifth Lun knocked on the side before, making this person's resume clear.

Lao Yangxiong also told him: "Liu Zijun's family has a tradition of changing its name, and his father's original name was Liu Gengsheng, and later changed his name to Liu Xiang. ”

In this way, it is known that Liu Xiu and Uncle Liu Ying are the names that were later changed, and they were originally called "Liu Xin", the word Zijun.

Liu Xin and his father led the school secretary during the Heping period of Emperor Cheng of the Han Dynasty, and also got acquainted with Yangxiong at that time, although Yangxiong had a lot of derogatory comments about Liu Xin, but he still admired his talent, and praised it as "mathematical skills, everything".

His name is very big: the banner bearer of the ancient scriptures, the great master of the Zuo Chuan and Zhou Li schools, plus the compilation of the three unified calendars, the revision of the pre-Qin book "Seven Strategies" and other achievements, the uneducated Fifth Lun did not understand until Yangxiong talked about it.

"When the previous dynasty mourned the emperor, Liu Xin returned to Tang Yu's ancient book "The Classic of Mountains and Seas" with 18 chapters, dedicated to the Son of Heaven."

At that time, the fifth Lun's eyes lit up, who did he look down on? Of course he knows the "Classic of Mountains and Seas"!

It's just that I've heard it but haven't seen it.

In this way, the identity of the national teacher has become extremely complicated: a great Confucian, a scholar, a writer, a lawyer, plus Wang Mang's closest comrades-in-arms and in-laws, which makes Wu Lun secretly suspicious: "This Liu Xiu ...... Is it really Liu Xiu, the son of that plane? It can't be the same name. ”

first helped Wang Mang replace the Western Han Dynasty, and then recreated an Eastern Han Dynasty against Mang? This script always feels a little strange.

And when he finally saw Liu Xin's true face today, Wu Lun found out, what kind of son of plane is this......

You can call the master of the plane!

According to Yang Xiong's description, Liu Xin should be about the same age as him, sixty-seven or eight this year. After Wu Lun followed Kui Huan and Liu Gong into the inner courtyard of the National Teacher's Mansion, he saw an old man sitting under a peach tree with bleak branches and leaves. He wears a plain white robe, a fox fur coat, and gray hair.

"Uncle, the fifth lun is here." Liu Gong called softly, making Liu Xin raise his head and look at it, and then didn't say anything, and continued to hang his head and think hard.

Liu Gong whispered to Wu Lun: "It's also unfortunate, the national teacher is just counting the hips, and you are sitting and waiting on the pu mat over there, if the national teacher doesn't call you, don't make a sound, if you disturb the national teacher, you will be driven out by the big stick." ”

So serious? Fifth Lun Yingnuo, now closer, he found that Liu Xin was far from the aging that he should have at his age, perhaps because he was good at maintenance, plus practicing body cultivation techniques, he looked only in his fifties. Every strand of hair and every strand of beard are neatly combed, and there are some fairy bones, which is much stronger than Yangxiong's old drunk.

The ground has a pattern that resembles eight trigrams, and the rings are paved with sand, which is different from the river sand, so it may be the finest sand transported from the seashore.

I saw Liu Xin holding rules and rules, constantly drawing circles on the sand, and then measuring with rulers and leather ropes, or carefully drawing polygons in the circles. He still has a stack of calculation chips next to him, and Liu Xin uses this ancient to backward tool to constantly combine complex mathematical operations.

Fifth Lun looked at this great power of dual cultivation of arts and sciences curiously, and then glanced at a tool thrown to the side, so he went over lightly and picked it up, and gasped after seeing it.

"It's ...... Vernier calipers? ”

This thing is made of bronze, more than one foot long, fixed ruler, fixed claw, fish-shaped handle, guide trough, guide pin, combination set, movable ruler, movable claw, handle and other parts are readily available, and the vernier caliper that will be exposed to junior high school physics classes in later generations is very similar.

However, after trying the fifth lun, he found that it was like a car, but he couldn't swim at all, and he could only use the indicator line to estimate the data below the length unit "minute" by visual measurement, which was not accurate enough.

"Give it to me."

Liu Xin probably calculated that when he wanted to use this thing, he stretched out his hand to ask for it, but he didn't raise his head, and only regarded the fifth Lun as a slave.

Fifth Lun carefully walked around the circle on the sand, he knew how furious the polytechnic dog would be when the calculation process was destroyed, and only handed the caliper to Liu Xin.

Just wanted to say something, such as pointing out a few words to Liu Xin, but unexpectedly, this old man waved impatiently to send off the guest.

"I've seen him, uncle, take him away."

……

It's really just a "meeting"! Fifth Lun only felt inexplicable.

After leaving the inner courtyard, the doctor Liu Gong smiled and said: "Uncle has always been like this, don't say Boyu, once the prince came to the mansion, he met him and was planning, and he also ignored it, and the prince could only return in a huff." ”

Wang Lin, the crown prince of the new dynasty, is Liu Xin's son-in-law, and he is fighting with Gongchong Gong Wang Zongming. Liu Xin naturally stood on the side of the prince, and Wu Lun knew that if he accepted Wang Zong's invitation today, the door of the National Teacher's Mansion would probably not be able to enter.

But after coming in, it was useless, and without saying a word to Liu Xin, it still couldn't rule out the possibility that he was Liu Xiu, the son of the plane, but he couldn't be sure.

Fortunately, Liu Gong treated him very politely, and asked Wu Lun to drink some warm wine to warm up and come back.

When the wine was placed, Wu Lun took the opportunity to ask: "Dare to ask Dr. Liu, isn't the national teacher calculating pi?" ”

The fifth Lun heard Yangxiong mention that "the ancient nine numbers, pi three, circle diameter rate one", which means that the ancients thought that the circle was three diameter one, and the division of the two was pi.

"That's true." Liu Gong said: "Has Boyu ever seen 'Jialiang'? That was made by my uncle at the behest of His Majesty. ”

Jialiang is the new dynasty's weights and measures instrument, the fifth Lun was also shocked when I first saw it, it is a copper cylinder, the inside is square, there are small ears on the left and right, it seems ordinary, but in fact, it is complete: with Hu Liang as the main body, the circle foot is the bucket volume, the left ear is the liter, the right ear is the upper one, the lower one is the amount of 龠 (yuè), and the weight is two jun.

On the back of it is the inscription: "Lijia Liang Hu, square ruler and outside it, 庣 (tiāo) next to nine centimeters and five millimeters, one hundred and sixty-two inches, deep ruler, one thousand six hundred and twenty inches, capacity ten buckets." “

The combination of five metrics on a small utensil is indeed exquisitely designed, which can be seen by Liu Xinzhi.

Liu Gong said: "When my uncle was making Jialiang, he found that the mistakes and omissions of the three paths that the ancients thought were too big, so that the circle did not form a circle, which damaged the method of weights and measures of the same law of the Holy Dynasty. He created his own method of calculation, broke through the circle, and re-obtained pi, and Jialiang was completed. “

"But recently, my uncle found that the pi was still not accurate enough, so he did the calculation repeatedly."

"How much did you count before?" Fifth Lun asked, and seeing that Liu Gong didn't say anything further, he deliberately said: "Don't hide it from Doctor Liu, my master Yungong has also been planning at home recently, and he has also gained something, which may benefit the national teacher." ”

"Ziyun Weng is also counting?"

Liu Gong didn't know that this was the fifth Lun nonsense, and after being stunned, he understood, and couldn't help laughing.

Okay, the two old enemies are fighting again! In the past few years, Liu Xin held back his strength and wanted to drum up a copy because Yangxiong didn't show him "Dialects", and Liu Gong got used to it after seeing a lot.

Liu Gong then gestured: "With the diameter of the circle as one zhang, the circumference of the surplus is three zhang and one foot five inches and eight minutes and six centimeters. ”

In these years, it is difficult to describe the number after the decimal point, so the 8 units of zhang, ruler, inch, minute, centimeter, milli, second, and sudden are expressed as integers.

"3.1586 Ah, it's good, but it's a lot worse......"

Fifth Lun came to see Liu Xin today, but he saw a loneliness, and then remembered that Yang Xiong came to the National Teacher's Mansion to intercede for him before, but Liu Xin ridiculed him, suffered a lot of grievances, and was depressed for several days.

He then took a little revenge, got up and said goodbye: "After several days of hard calculations, my master and I have found the most accurate pi, even if Zhang Cang is resurrected, it cannot be exceeded. ”

"Therefore, the National Teacher University doesn't have to waste any more time and calculate it for nothing."

Liu Gong raised his face: "You son, your tone is not small, a few days of work, you can surpass your uncle for more than ten years?" ”

Wu Lun smiled: "If you don't believe it, the doctor will tell the national teacher a number, and let him calculate it in reverse, and then he will know which is better and which is worse!" ”

Isn't this a fire for the two old enemies, but Liu Gong also wants to see this excitement.

Fifth Lun left a number and left, and for people like Liu Xin, who are stuck on a mathematical problem, only telling him the answer and not explaining his solution process is even more annoying.

Regardless of whether he is the son of the plane or not, he will speak for Yangxiong first.

Shaoqing, who was meditating hard under the peach tree, but because of the error in the accuracy of the algorithm and tools, Liu Xin, who had not been able to get more accurate results for a long time, heard a string of numbers from Liu Gong's mouth.

"Uncle, Yang Xiong, the fifth Lun calculated the circumferential surplus is ......"

"Three feet, one foot, four inches, one minute, five centimeters, nine millimeters, two seconds, six seconds!"

……

On the other side, the eighth correction also returned to the Tai Student dormitory with a spring face and began to pack his bags.

Liu Xiu, who happened to live next door, came over and couldn't help but be surprised.

"Ji Zheng, where is this going? Traveling far or going home. ”

After raising the flag to save Lun, the eighth correction trusted Liu Xiu very much, and he was honest and sincere, when Liu Xiu was the same kind of person as himself, he smiled and told him about today's events.

"I'm going to go to the Gongchong Mansion the day after tomorrow, as a Duchy Xian Ma, I can't continue to be classmates with Uncle Wen anymore."

Hearing this, Liu Xiu was taken aback, but he was worried about another person: "The fifth Boyu was also hired by Gong Chonggong?" ”

The eighth shook his head: "It's not, Boyu intends to go into hiding, and has no intention of pursuing a career, so he refused." ”

As soon as he finished speaking, Liu Xiu couldn't help laughing, and Eighth Jiao didn't understand what he was happy about.

Liu Xiu only said that he came to thank the Fifth Lun brothers for giving charcoal, and as a thank you gift from the Fifth Lun, the students who participated in the flag raising all got a share.

And Liu Xiu unexpectedly received twice the amount, which was comparable to Liu Long, and it seemed that the fifth Lun already knew who the main hero of that day was.

Although Liu Xiu was indifferent on his face, he was still a little happy in his heart: "Fifth Lun remembers Uncle Liu Wen." ”

After this battle, the reputation of the Fifth Lun has spread in Chang'an, and then look around, so many students participated in this matter, and they received the gift of the Fifth Lun, the gift is light and the friendship is heavy. They come from all over the world, and when they return to their hometowns after completing their studies, they will spread the word of mouth and spread the fame to the world for Wu Lun.

"It would be nice if my brother could be assisted by such a famous person."

Now that he learned that Wu Lun had no intention of entering the Shi Mang Dynasty, Liu Xiu was even more overjoyed in his heart.

Liu Xiu had heard the story of Gong Sheng, a Confucian who was known for his harsh punishments and harsh punishments. Later, he was dissatisfied with Emperor Han Ai's favor Dong Xian, and ridiculed him, and when Wang Mang was in power, Gong Sheng saw Wang Mang's intentions and returned to his hometown.

In the third year of the founding of the new dynasty (11 AD), Wang Mang wanted to hire Gong Sheng to be the prince's teacher, but Gong Sheng refused to accept the order, resolutely did not get into the car, and finally died of hunger strike.

There is also Guo Dan in the same county as Liu Xiu, Guo Dan is a native of Sui County, seven years old and lonely, famous for his filial piety to his stepmother, and later entered Chang'an Taixue, often speaking, Confucianism respects it. After Wang Mang usurped the throne, he conquered Guo Dan twice, promising a high position, but Guo Dan resigned, and finally ran to Beidi County, where the government was weak, with a group of students.

In Liu Xiu's eyes, the combination of not being a priest and returning to seclusion is simply synonymous with dissatisfaction with Wang Mang!

After returning to the living room, the corners of Liu Xiu's mouth curled into √.

"These are those who have gone into seclusion."

"One counts as one, and everyone misses me as a big man!"

……

PS: Shizhong, Fengche Duwei, Guanglu Doctor Chenxiu Collar School, Secretary Yan School, Secretary Taichang Chenwang School "Classic of Mountains and Seas" 32 articles, now set to 18 articles, has been decided. ——"The Classic of Mountains and Seas"

In addition, Liu Xin was the first person in China to try to calculate pi.