"Liaodong is so bitterly cold, most of them will not be cared for, otherwise this old county guard will not guard Youzhou for such a long time." Zhang Dasu pondered.

Zhang Daxiang's face was solemn, "Just like Xu Jingzong said, the Diplomatic Institute in Liaodong needs to be operated, and Zhang Yang has also explained that it is very important to the Foreign Academy. ”

The three of them looked solemn and were quiet for a long time.

Xu Jingzong pondered, "Da'an is because the imperial examination was written in Liaodong, so it will be arranged in Liaodong, Your Majesty has just rectified the rule of officials, and the imperial examination will be held in the coming year, and it will be said that sending people to Liaodong will wait until the summer of next year at the earliest." ”

In order to seize power, it is necessary to control Liaodong, and even more so, to develop Liaodong.

The three of them are facing a very serious problem at the moment, that is, how to make His Majesty not pay attention to Liaodong and put Liaodong on hold in court politics first.

"I don't know what Zhang Shangshu is doing now." Xu Jingzong said suddenly.

"If he's here, maybe there's a way?" Zhang Dasu said.

The two of them in front of them have a lot of trust in Zhang Yang, it is said that they are the Shangshu of the Ministry of Rites, and they are in control of the Foreign Affairs Academy, everyone has to listen to Zhang Yang's orders and arrangements, no matter how they say that they are Shangguan.

He is estranged from political affairs, and every time he encounters various things that are difficult to make a choice, the three squires discuss them together.

While the three of them were still deliberating, Dickinson walked to the door of the Diplomatic Academy, and there were more pedestrians on the street than usual, and many of them were traveling together as a family at the end of the year.

Di Zhixun looked at the heavy snow and had a feeling of nowhere to go, and then thought about it and walked back to the courtyard, where in the backyard, there was also a row of houses, and many scribes who could not find a place to live in Chang'an City would also live here.

It doesn't cost anything to live here, it usually seems crowded, but now it's quite empty, and there are only three or two beds with futons on them.

Dickinson opened his futon, took out a book, and sat quietly reading.

Since the completion of Li Chunfeng's zodiac armillary sphere last year, a year has passed now, and Yuan Tiangang has been exploring a problem for the past year.

Inside the Qin Tian Prison.

Now in front of Yuan Tiangang there is a roll of sand table measurement results, all of which are carried out with iron pestles of the same length.

There must be many discrepancies in the results, and the places selected are the most characteristic of the mountains and rivers, and they are also far away.

Yuan Tiangang stroked his head and said, "Where is Zhang Yang?" The old man wants to see him. ”

Li Chunfeng, who was sitting on the side, was studying a math problem in front of him, which Zhang Yang had given to Guozijian at the beginning, saying that it was a question for the imperial examination.

It's not difficult to look at this question, isn't it just a result obtained by dividing and converting numbers with different properties.

This kind of problem helps people to understand the number of arts, in the past, they would compete with others for the operation of number technology, but now in this realm, number operation is a very boring and boring thing for him, and he prefers to study the number series itself.

"Did you hear the old man's words?"

Li Chunfeng came back to his senses at this time, "What did Daoist Yuan say?" ”

Yuan Tiangang said melancholy: "You are afraid that the old man is crazy, and now the old man is crazy when he sees that you specialize in mathematics." ”

He took two steps forward and then said, "Chunfeng, you were quite intelligent when you were young, and you still haven't understood it?" Zhang Yang is leading you to an infinite realm, a realm that you and I mortals can grasp. ”

Li Chunfeng put away the scroll and stood up, "Daoist Yuan is saying that what is the deeper realm of mathematics?" ”

Yuan Tiangang closed his eyes and said, "As soon as the wind and snow stop, I will go to Zhang Yang to ask for an understanding." ”

The heavy snow fell for five days in a row, and when the snow stopped, Zhang Yang took his family to Lishan.

The court is also closed, so it is just right to come to Lishan to rest for a while, relax and build a new home.

Xiao Wu and Xu Hui went to the village to have fun, and the furniture that Zhang Yang arranged listened to the two little girls whispering, planning to take the little bear to Lishan to play, which was quite adventurous.

The two aunts carried a large box, which contained the gold that was robbed at the beginning, and it was also where Li Shimin's heart disease was.

"Your Royal Highness Princess, where do you put this box?"

"Now the new home can't be lived in, it must not be placed on the mountain, so it is buried in this yard, and it can also be used for emergency use if necessary."

Seeing the two girls walking towards the mountain with the little bear, Aunt Wang said worriedly: "Your Royal Highness the princess, Xiao Wu and Xiao Hui have entered the mountain." ”

Li Yue glanced at it and smiled: "Very sensible, I will bring them back before dark." ”

When Zhang Yang walked out of his house, there was still snow piled up on both sides of the road in the village, and the air at the foot of Lishan Mountain was cold, and when the weather cleared for two more days, the snow should melt.

"County Marquis, go and meet His Royal Highness King Wei." Two guards came with sad faces.

"What's wrong with him?"

"I don't know about my humble position, and now King Wei is crying and howling."

Just be a good cash cow in Lishan, as long as this little fat man makes good money, his life will not be bad.

Li Tai built a small courtyard in Lishan, which was the new Wei Palace.

If it is not necessary, he will not return to Chang'an City, saying that he is nauseous and wants to vomit as soon as he enters Chang'an City, and he doesn't know what is wrong with Chang'an City, so that he has such symptoms.

"The king's money."

Li Tai's cry was heard in the courtyard.

Glancing at the guards in front of the door again, Zhang Yang stepped in, "His Royal Highness King Wei, how are you doing recently?" ”

Li Tai wiped his tears and choked up, "The Turkic cattle and sheep have died a lot, brother-in-law, we have lost a lot of money, so let's not contract." ”

"Why don't you contract, we should buy a lot at this time."

"What?" Li Tai was so stunned that he even held back his tears.

Seeing that his brother-in-law was overjoyed, he rubbed his eyes in confusion, "What did my brother-in-law just say?" ”

"I said we should buy a lot now and control more pasture."

Li Tai stood up, his expression was still a little dazed, "Slow, why did my brother-in-law say this?" ”

"If this kind of thing happens in the pasture, it will affect the number of sheep in the coming year, and the herdsmen will naturally be willing to sell the pasture to us if they have fewer livestock, and send people to see the situation of the Turks, to see if they can collect more pasture, and by the way, the pasture contracted last year will be discussed as soon as possible to negotiate the contract price for the next year while it is now."

Li Tai calculated a little, the most fertile pasture north of Yinshan was already in the hands of Lishan, and if it was to be expanded, he could only choose the grassland west of Yinshan.

The little fat man walked back and forth thinking about it.

"Your Royal Highness King Wei, there is no time to miss the time, I have already given the wool fabric to your father and your mother, and the three thousand feet of wool fabric stored will officially start to be sold next month."

"How much money can you earn from 3,000 feet of wool fabric?"

"It's a kind of luxury, as long as it opens up sales among the powerful, you don't have to worry about selling it."

"How much silver a foot?" Li Tai hesitated.

"Then it depends on how well your father and mother sell our wool, King Wei, everyone has a love for beauty, people wear thick clothes in winter, the biggest advantage of this fabric is to wear the least clothes, enjoy the best warmth effect."

Li Tai looked at the bloated clothes on his body again, and even the king did not use the cloth spun from wool.

"I will arrange for someone to go to the grassland to lobby again, if Ashinadur knows, I'm afraid it won't be good."

"Don't worry, he won't be able to go to Turkia in the past two years."

"Really?"

"I arranged it."

Zhang Yang and his brother-in-law were discussing the grassland plan, and the guards came quickly to interrupt the conversation, "County Marquis, His Royal Highness the King of Wei, Daoist Yuan and Daoist Li Chunfeng are here. ”

Li Tai hurriedly said, "Please come in quickly." ”

Zhang Yang said with a smile: "Please also ask His Royal Highness King Wei to prepare early, and I will go back." ”

"The county marquis stays." The guard stepped forward again, "The two Dao Chiefs are not here to see His Royal Highness the King of Wei, but to see the county waiter." ”

Zhang Yang nodded and said, "Then invite people in." ”

Li Tai was very interested, "I heard that because of the sand table at the beginning, the two Taoist leaders sent a lot of people to build the sand table this year, and this king also wants to know how the progress is." ”

People have always had a curiosity about the world.

The time and effort required to find this truth is unimaginable, and sometimes even multi-generational.

Not to mention Datang without the blessing of industry.

After a short time, the guards took the two Taoist leaders outside the courtyard.

Yuan Tiangang walked into the courtyard first, he didn't speak, but sat down cross-legged and took off the burden on his shoulders, and then slowly opened it.

Seeing the compass and the dust, Zhang Yang couldn't help but be curious: "Daoist Yuan also wants to do things?" ”

Yuan Tiangang sat upright, "The old man has never done things to fool the villagers. ”

Puzzled again, Zhang Yang stepped forward with his hand and asked again: "You sit like this, it's strange and solemn." ”

Yuan Tiangang took out a roll of bamboo slips, "These are all accounts of the sand tables that the old man sent people to various places to make, all over the Central Plains in thirteen places, and there are people further north who have not sent the results." ”

"North?"

Yuan Tiangang nodded, "In the deeper part of the north, I don't know if I died in the middle of the road." ”

Zhang Yang gasped, the ancients could even talk about life and death so lightly for the sake of their life's achievements, if they really died in the middle of the road, they couldn't help but sigh with emotion: "For the sake of the Tang Dynasty." ”

Yuan Tiangang held the dust in his hand, "These accounts are different, but the poor Dao still can't be understood, and he needs the guidance of the county marquis." ”

Daoist Li Chunfeng also stood aside and saluted.

The attitude of the two was very serious, Zhang Yang picked up a scroll on the ground and opened it and looked at it, which was brought from Lingnan, and it was written that the sand table changed every day, and it was recorded for a total of one hundred and fifteen days.

I picked up another roll and looked at it carefully.

After a while, Li Chunfeng said again: "Dare to ask the county marquis, can there be a result?" ”

Zhang Yang said loudly: "Bring a pen and paper." ”

Li Tai moved quickly, bringing an inkstone and a pen from the house, as well as the rough paper characteristic of Lishan.

Everyone looked intently and saw Zhang Yang draw a circle on the paper.

Li Tai confirmed that he was not mistaken, it was a circle, and nothing else.

Li Chunfeng was about to ask something, but saw that Zhang Yang was starting to write again.

A straight line runs through the center of the circle from the other end, and then a line goes down from the top, and two lines run through it.

Zhang Yang continued to take the pen and began to draw, "For example, this is Lingnan, and the sand table traces here are one inch and five. ”

After making a mark, Zhang Yang picked up another volume, "Handan, two inches and seven." ”

Still picking up a roll, Zhang Yang continued to mark on this circle, "Hexi two inches nine." ”

"Shuo Fang, three inches."

After marking the thirteen places, Zhang Yang put down the pen in his hand.

Yuan Tiangang looked at the circle with bated breath, "What does this mean?" ”

Zhang Yang smiled: "Didn't Daoist Yuan find out? The further north you go, the longer the scratches on the sand table. ”

Li Chunfeng nodded, "That's true." ”

"Are we really on a ball?" Yuan Tiangang was stunned and muttered to himself, in the face of this truth, he felt a chill in his back at this time, what have people been pursuing for so many years?

Li Tai ate the dried fruit in his mouth, "Why can we conclude that we live on a ball based on this?" ”

Li Chunfeng explained: "Your Royal Highness King Wei, if the earth is really rotating, the point of the hemisphere will be faster, and if you put the sand table on the top edge of this ball, the traces on the sand table will continue to draw circles. ”

Zhang Yang looked at the things in Yuan Tiangang's baggage, "Daoist Yuan, you have a good compass, can you give it to me?" ”

Yuan Tiangang's gaze was still on the map, "Take it." ”

Leaving Yuan Tiangang stunned here, Zhang Yang walked out of the courtyard with a compass, and then looked at this wooden compass, the edge of the compass was written with various marks and symbols, if you read it correctly, this should be an astrological compass.

It is used to determine the direction of the stars and to determine the calendar.

This is a good thing, and it is helpful for the daughter-in-law to learn latitude and longitude.

Never underestimate the wisdom of the ancients, who were able to use this compass to determine the coordinate system.

Zhang Yang returned home with the compass and rummaged through his daughter-in-law's box.

provoked Li Yue to be displeased: "What is the husband looking for?"

"Is the scroll I read before?"

Li Yue opened another box, and the Han books were all in this box.

Back then, there was a guy named Gongsun Qing, who and Sima Qian jointly compiled the calendar, and there was this volume of the Taichu calendar, and this volume of the calendar has been revised many times by predecessors since the Eastern Han Dynasty, and it is still complete.

It is also rare to have this book in the collection of the former Sui, and it is also the only book among the only books to get outside.

Zhang Yang opened the book, compared it to the symbols on the compass, picked up the pen, took out a roll of paper, spread it out, and began to make scales.

If you want to understand the understanding of the astrological coordinates of the ancients, you must use the way of the ancients to deduce.

It was a long process from the establishment of the calendar by Zhou Tianzi to the confirmation of the thirty-two scales.

Seeing that her husband is so attentive, Li Yue is not easy to disturb.

In the evening, Xiao Wu and Xu Hui came back riding the bear together, and the two girls went to the mountains to play for a day, their clothes were dirty and their faces were embarrassed.

Until it was night, Zhang Yang put down his pen and looked at the compass he had drawn.

Li Yue took a bath for Xu Hui and Xiao Wu and changed into clean clothes, and looked down at the painting by her husband, "What is this?" ”

"The astrological compass, Yuan Daochang's compass is not complete, I added some annotations to make it easy to understand, which is very helpful for you to learn latitude and longitude."

The problem of latitude and longitude has been bothering her for three years.

"I always wanted my husband to teach me, but he didn't teach me."

Listening to some complaints in her words, Zhang Yang took her hand and smiled, "There were too many uncertainties before, and I was afraid that I wouldn't be able to teach well." ”

"As long as my husband teaches me, I will learn it." Li Yue whispered.

The couple walked all the way to the entrance of the village, today's starry sky is very beautiful, and the vast galaxy is in the dark night sky.

"Countless generations have looked up at the stars, and they have all wanted to know the mysteries of the stars, and now I will tell you some of them."