"Why don't you leave? Do you still let me take care of the meal?" After the discussion, Liu Zhu and others already understood the layout of the young emperor. Peace negotiations were just a means of struggle. The Northern Expedition was only slowed down for the time being and did not give up their original ambitions. After the confusion was eliminated, everyone retreated from the palace. Ni Liang is still in charge of the guard camp, and it is normal for him to stay in the palace, but Chen Dun and Jiang Chaozong did not leave either. Zhao Bing smiled.

"Your Majesty is still so stingy!" Chen Dun curled his lips and said, "I heard that the commander-in-chief of Your Majesty's guard camp has been vacant, and there has been no suitable candidate. It seems that I am troublesome!"

"In this way, you are the one who has been a wise man to me!" Zhao Bing smiled, "If it is in line with my wishes, you can consider keeping you for a meal."

"Thank you, Your Majesty!" Chen Dun rolled his eyes and bowed his hands randomly, "In the last martial arts, my subordinates found a suitable candidate named Xu Hong, who was 31 years old. His father was originally a magistrate of Changzhou. He died in the battle of the Mongolian Yuan to Changzhou. His family suffered a disaster. He passed the state test and went to Beijing to take the provincial test and escaped. After the fall of Lin'an, he wandered to Fuguang area with the fugitives, and then followed a group of scholars to Qiongzhou."

"Did Your Majesty find a scholar as a guard?" Zhao Bing said without saying a word, Ni Liang stared at him and said in surprise.

"Let me finish speaking!" Chen Dun retorted mercilessly, "After Xu Hong arrived in Qiongzhou, he did not participate in the imperial examination, but abandoned his pen and joined the army and entered the Second Division to serve. During this period, he participated in several battles against the Mongolian Yuan. Because of his bravery in combat, he was promoted to the commander of the team. Later, he was selected into the new army training camp. After training, he returned to the second division as a 1st regiment to join the army. In the battle to recover Jiangnan, he served as the commander of the battalion for his merits. After expanding the army, he was promoted to the commander of the third division and the first regiment of the second army, and the division Sima and other positions."

"It's a pity that at the beginning of the Northern Expedition last year, he was injured in the Battle of Huaidong, and he was withdrawn from Lin'an to recuperate. After he recovered from his injuries, he entered the short-term training class of senior military officers in martial arts." Chen Dun said, "I have investigated him, his family is innocent, and his tribe members did not treason during the fall of Jiangnan. He acted in the military, fought bravely and had great strategy, and his colleagues praised him very well. Moreover, I have many contacts with him in martial arts. He treats people and things very well and is quite sensible. It is rare that he is a scholar, who is good at writing and has rules and regulations."

"It's not your old friend in the New Army training camp, right? Now I want to take the opportunity to find a good job for him!" Ni Liang said on the side.

"So what, so what, no? You presided over the new army training camp, and Your Majesty also personally taught you. Speaking of which, most of the officers and assistants at the moment have something to do with you, so what should you say?" Chen Dun was smart since he was a child and dared to roll his eyes to Your Majesty. However, Ni Liang was clumsy and stupid, not good at speaking, and couldn't say anything in his stomach. He was choked by the 'fury' of him.

"You two are both the chief officials in the guard camp. You know what kind of people you need and what rules you have. The matter of selecting people will be left to you. This... As long as Xu Hong can pass Ni Liang's approval, I have no objection!" Zhao Bing waved his hand and said. He knew that Tan Fei's departure was related to Ni Liang's persistence. He could not allow a person who dared to resist the order to stay by Your Majesty's side, even if it was out of good intentions, that would not work. So he handed over this task to the two of them, one was smart and capable, and the other adhered to the principles. He believed that there would be no problem to pass the two of them's investigation.

"I follow the order!" With the support of the emperor, Ni Liang snorted coldly at him and said.

"Hmph, this doesn't work. You can choose one for me to see!" Chen Dun said authentically, either showing off his weakness.

"Chaozong, what are you doing?" Jiang Chaozong, who is usually a chatterbox, did not interrupt a word. Instead, he looked at the map spread on the table just now and stared at the map, Zhao Bing asked curiously.

"Your Majesty, why can the maps used in the palace be distorted? The further the maps of the subordinates become, the less accurate!" Jiang Chaozong was the head of the Privy Council Office. His responsibility was to survey the geography and rivers of the world, and to draw maps. So he soon discovered that the maps in the palace were very different from those drawn by the Maj. He was more accurate than his own.

"Well..." Zhao Bing frowned when he heard this. In fact, the answer was very simple, but he didn't know how to explain it for a while. Because this is not only a difference in drawing methods, but also involves the current people's understanding of the world.

Cartography is an ancient discipline in the East and the West, which can be traced back to prehistoric descriptions of the fishing and hunting domain. In Europe, Greek astronomer Elatoseni was able to calculate the correct value of the length of the earth's surface within a range of fifty miles. Marinus, a Greek in the 1st century BC, first proposed the idea of ​​using projection on maps - compressing all or part of the earth's circular surface onto a plane.

In China, topographic surveying and mapping are naturally very ancient. In the pre-Qin period, the measurement tools "regulation" and "routines" were invented and topographic measurements and orientation measurements were carried out. In the Han Dynasty, astronomical positioning was introduced into orientation measurement, and the principle of measuring distances of cross-line grids was also applied. Speaking of map drawing, when the ancient Romans were still drawing road mileage maps, Pei Xiu of the Jin Dynasty developed a set of theories for drawing maps and drew the "Yugong Regional Map" based on this.

Zhao Bing knew that the East and the West had already embarked on two paths in cartography at this time, and Pei Xiu's theory on drawing could influence China for more than a thousand years. His theory can be summarized as "the six bodies of drawing", that is, six factors to be considered when making drawings: division rate (scale), expectation (direction), road (road mileage), height (top height), ground evil (angle), and straightness (curvature).

With these considerations, the spatial relationships of each landmark can be determined, but how do you present these relationships on a plan? This leads to the method of "planning the squares in the plot", which is a method of drawing grids in proportion to correctly reduce the size of the map. First, the grid is covered with squares, and the side length of the grid represents the number of miles in the field; then draw the map content according to the frame of the grid.

Therefore, the "Six-body Making" has become an important basis for traditional Chinese mapping theory. The method of drawing the square in Jili is the basic operation method. Both have been used for more than 1,500 years. Jili Painting Square is indispensable for famous maps in all dynasties. After Pei Xiu, there were also "The Picture of the Chinese and Nobles in the Sea" by Jia Dan of the Tang Dynasty, "The Picture of the World and County" by Shen Kuo of the Northern Song Dynasty, and "The Map of the Map of Zhu Siben of the Yuan Dynasty. However, they did not break out of this circle. The improvements of the previous dynasties mainly focus on the accuracy of latitude and mileage measurement and the conversion ratio.

In the Song Dynasty, instruments such as "level" (leveling instrument), "looking at the ruler" (surrowing the board), "dry ruler" (dry) were commonly used to measure the height of the terrain. Shen Kuo replaced "daoli" with "mutual sameness", which can be regarded as modern contour marks. Although Guo Shoujing can accurately measure the latitudes of various places, no one applied this result to map drawings. The highest achievement of maps during this period was Zhu Siben's "Yu Map". Its advantage is that because Zhu Siben was diligent in field investigations, the location, shape and distance of mountains, lakes, and rivers were drawn more accurately.

When Zhao Bing came to this world, he knew the importance of maps to a country, so he attached great importance to it. Due to the constraints of tradition and concept, he did not dare to directly quote Western projection methods, but instead borrowed from Luo Hongxian's "Planning Method" method in the Ming Dynasty.

This method is still derived from the six-body drawings. However, Luo Hong first created a systematic method of using legends and fully adopted the "Planning and Drawing Method" method. The establishment of scale also varies according to the scope of the map, which is convenient for splicing and interpretation. The general drawing principle of the map is 500 miles per square, and is divided into 100 miles per square. Other special maps use 40 miles per square, 200 miles per square, 400 miles per square, and 500 miles per square.

The method of drawing in China has been used for more than a thousand times. It is indeed incredible to be used in the current environment of changing technology iterations, but in ancient times, since it could meet the needs of map users, there was no motivation to make it be replaced. Objectively speaking, the method of drawing in China did not take into account the curvature of the earth. Except for the accuracy of the center, the more it deformed around it, which is the problem discovered by Jiang Chaozong.

At the same time, Matteo Ricci came to China with the "modern" map of Europe, but when foreign technological innovations were in front of us were enough to become a driving force, when the modern map technology of Europe and the world concepts it carries intersected with China, when China could have absorbed this technology to make itself participate faster in the development process of modern maps and even the development process of world history, China gave up this opportunity under the will of imperial power.

The result is obviously that during the formation of modern maps, Europeans depicted China in the world map. Documents and images about China and Europeans' actual experiences in China are reflected in the production of world maps. China's traditional mapping technology did not really participate in this process. Even if Wei Kuangguo used the Ming Dynasty map as material, it must be re-corrected by European methods.

Zhao Bing refers to the current map and then uses projection method to re-correct it. Therefore, the grid presented by the map in the palace is not a regular square, but considers the curvature of the earth, which is similar to a trapezoid on the map. To explain this problem, the problem that the earth is round cannot be avoided, which is contrary to the ancient Chinese view of the sky and the earth.

Zhao Bing knew that although he would not face the fate of being burned to death in the Western world, he would also be considered a lunatic, which was also the reason why he was reluctant to act without hesitation. But after thinking about it, the people in front of him could be said to be his confidants and would not talk nonsense. And as his plan was unfolding, some problems could not be avoided, so it would be fine to let them know a little earlier.

So Zhao Bing called a small yellow door and whispered to him, asking him to pick up something. After a while, the small yellow door came in with a wooden box that was one foot square and two feet tall and placed it on the table. When he opened the wooden box, everyone's curious eyes turned to doubt, and they didn't know what it was...
Chapter completed!