PS: Anti-theft chapter, to be revised later

The two brothers Xue Ne and Xue Chuyu under Li Yu were originally second-rate generals in history.

In history, Xue Ne invited Xuanzong, who had just ascended the throne, to attack the Khitan in the second year of Kaiyuan, and led an army of 20,000 to fight against the defeat of being ambushed by the Khitan.

Even if he entered the army and led the troops to fight decades in advance due to Li Yu's influence, it would be stronger than the original history, and it would definitely be no problem to beat Wang Xiaojie in the Wuzhou period more than ten years later. But in the face of the pervert of Pei Xingjian who used soldiers like a god in the current dynasty, first-class generals like Liu Renliang, Wang Fangyi, and Cheng Wuting, it was better to forget it.

The two brothers Xue Ne and Xue Chuyu, who have left a good reputation as famous generals in history, are like this, not to mention the generals and colonels under Li Yu who left a name in the history books with the light of their father and brother, let alone those who didn't even leave their names.

Li Yu instigated the wings of butterflies, and if they could become second-rate celebrities after being tested in battle for a long time, they had to burn high incense.

Of course, Li Yu still expects that there will be a first-class star among them, depending on who has this potential.

……

Ling'er entered the study with a few books in her hand, and was surprised to see Li Yu lying on the desk with a loveless appearance and casually discarding the scrolls.

"Jun Xun, what happened, the slave family has never seen you so sad?"

Ling'er asked as she picked up the scattered scrolls on the ground.

Li Yu, who was close to him, didn't dare to say what would happen in the future, so he had to smile bitterly: "Homesick......"

What a high-sounding reason, Ling'er stared at Li Yu suspiciously, and complained in her heart: "The expressions of sorrow and homesickness on the face are not at all the same, since Jun Xun doesn't want to say it, then forget it." ”

Ling'er is not a person who gets to the bottom of it, so she directly ignored Li Yu and slowly cleaned up the messy study.

"Fortunately, Ling'er is not Xing'er who saw her appearance just now, otherwise, tomorrow the whole house will know that she is hiding in the study with a sad face."

Li Yu picked up a book of notes brought by Ling'er, opened it to check it, and asked the busy Ling'er: "Ling'er, what are the contents of these notes you brought?" ”

"The first is the turnover of Cui Xuan's various commercial banks this year, of which two million gold, silver and copper coins arrived in Pyongyang yesterday by Jiaolonghai shipping. The first is Longyin Qianzhuang please play Jun, how much money should be minted this year? How many gold, silver and bronze are cast? Our secretariat has formulated a few suggestions, depending on what you mean. The third is the allocation of materials for the development and construction of the north coast of Shaohai, and the formal implementation of the administrative system for the cities established along the coast of Shaohai in the past two years. The fourth is the specific regulations for the construction of a new governor's office drawn up by Xun Jun at the end of this year and early next year to implement the construction of a new Governor's Office on the southern islands of Luzon Island, the west coast of Borneo, and the northwest coast of the Liangji Peninsula in the South Ocean. The fifth part is a report on the recent events in the DPRK and China. ”

After Ling'er finished cleaning up, she gasped lightly, and her small chest agitated up and down, causing Li Yu to take a few more looks.

PS: Anti-theft chapter, to be revised later

Since bidding farewell to his old friend Li Chunfeng a few months ago, he began his journey eastward from Chang'an in order to study the correctness of the longitude and latitude theory in the theory of the circle of the earth proposed by the Western Romans brought by King Yan.

Since measuring the latitude of Chang'an, he has successively measured the latitude of Xinfeng, Weinan, Huazhou, Tongguan, Luoyang, and Biansong Bolu.

Take a pole and a tape measure to measure the length of the sun's shadow to determine the altitude angle of the sun, and make and convert the astronomical calendar, and calculate the distance between the north and the south.

In the "Geography Guide", it is proposed that the earth is spherical, and a latitude line covering 90 degrees of north and south in the world is artificially formulated, which describes the altitude angle of the sun in each place measured by the shortest shadow length every day, and the local latitude is calculated by converting the relationship between 90 degrees and the direct point of the sun, and then the distance between each degree of latitude is determined by the distance actually measured between the north and the south.

Of course, Ptolemy's theoretical measurement of the earth's latitude and longitude and period in the "Guide to Geography" had serious errors and omissions, so when Li Yu got the translated "Guide to Geography", he added the high school geography knowledge he had learned in later generations.

Li Yu discusses some geographical knowledge that did not exist in this era in the book in a speculative tone, the purpose of which is to enlighten the people of the world and open the window of modern geography to them. As for the geographical knowledge that existed in the world, but there are differences between ancient and modern descriptions and expressions, Li Yu summarized and discussed them in the form of modern geographical descriptions and expressions, and extended them to support the modern geographical knowledge that had not yet been discovered in the Tang Dynasty.

Before setting off, Hu Huichao got a copy of the "Guide to Geography" that had been revised by Li Yu, which had a great enlightening effect on him, so that he wanted to walk the world to verify the theory of latitude and longitude despite his own gradual entry into his old age.

Li Yu only proposed in the book that the direct point of the sun in each season is different, but he has no way to corroborate, so he can only propose it in a speculative tone in the book.

The same measurement of latitude is inseparable from the equator, that is, the 0 degree latitude, and the equator is naturally drawn according to the theory of the circle of the earth, and the middle position on the earth model made by Li Yu with incorrect geographical coordinates is shown to Hu Huichao.

Hu Huichao reluctantly recognized it, and in view of the fact that the direct point of the sun could not be determined, he compromised to use the equator for latitude conversion, although there was an error, but he could only admit it. To solve this problem, at least until Li Yu realizes his plan, he can organize people to carry out this astronomical research.

Two miles away is Yangzhou City, and Hu Huichao is the first time to come to Yangzhou. I haven't arrived in Yangzhou City, but I feel the prosperity of Yangzhou, and the business travel on the way to Yangzhou City is endless.

There are also many small shops on the roadside for passers-by to rest, and the business of the shops is very prosperous, and many business tourists who are in a hurry to rest in them.

This is Jiangnan, and many places are rich in tea, so Jiangnan is the favorite place to drink tea in addition to Bashu. In the small shop, tea is offered to customers who stop by to quench their thirst. The new tea of Chang'an Yanwangfu has not yet reached Jiangnan, otherwise it will set off a new tea wind in Jiangnan.

Hu Huichao, who had been on the road for a long time, thought that he was about to arrive in Yangzhou, so he would get off the horse first and rest in the roadside shop for a while.

The guy in the small shop saw Hu Huichao coming, and hurriedly stepped forward to greet him: "Dao Chief, please sit down like this!" ”

Hu Huichao sat at an empty table under the guidance of his buddy.

"Dao Chang, our store has boiled Xishan Bailu, Muzhou Tonglu's Jiukeng, Shouzhou Huangya, Changzhou Yangxian tea, I don't know which one you want to drink?"

Unexpectedly, a small shop on the roadside outside Yangzhou City provided several famous teas in the south of the Yangtze River. Hu Huichao thought about it, he was a native of Hongzhou and became a monk in Xishan, and Bailu was produced in Xishan, where his cultivation was located. In the past, I was used to drinking white dew from time to time before leaving Xishan, and I hadn't drunk it for a long time after leaving for so long, so I said: "Just come to the pot of Xishan Bailu." ”