Li Hong looked at the dragon mother as a treasure, and continued to draw a map with his temporary feet, carefully smoothing the folds on it, and his heart was full of respect and admiration for this historical generation of empresses.

He knew better than anyone how shocking such a map was to Wu Mei when it appeared in her eyes.

After all, the maps of this period are all maps based on mountains and rivers, and the county maps and city maps are first drawn in the center of the city, and then the mountains, rivers, rivers and other places in the jurisdiction are drawn according to the approximate orientation corresponding to the center of the city, and finally the nearby villages and other places are filled in to the corresponding foothills and rivers, forming a regional map.

Due to the lack of positioning technology, and there is no coordinate system such as latitude and longitude, the error of the drawn map will increase with the increase of the map, and the area is not proportional to the region at all, resulting in people can only follow the map, as if they are led forward, if not, they will be lost, do not know where they are.

As for complex forms such as mountainous areas, this kind of map is of no use at all, so in this period, the fiddling of the sand table is extremely important in military affairs, and it is more popular with military generals than unreliable maps.

As for the current waterway map, with the increasing importance of the Sui and Tang canals in this period, the waterway map drawn by the Tang people is that the mapper stands at the bow of the boat, first draws Luoyang at this end, and then with the movement of the ship, the drawer draws the cities, mountains and rivers seen along the line one by one, and after arriving in Hangzhou, he draws Hangzhou at the end of the drawn map, so this waterway map comes into being.

This kind of map has no actual reference function, it is like a mapper who has played around and drawn what he has seen and heard.

There is no direction or proportion to speak of, so if you are in a good mood, you can draw this place better, and if you are in a bad mood, you will draw a few fewer strokes of this place, and the map it makes is more like an artistic painting than a professional map.

When Li Hong was ten years old, he once instigated Li Chunfeng, and the astronomical telescope made for Li Chunfeng at that time made Li Chunfeng crazy for a year, and he almost relied on the telescope every day.

At the same time, the extension of the Hongwen Pavilion began to use the "plan to draw the square" and the "six bodies of cartography" made by Pei Xiu of the Jin Dynasty, and began to redraw the map of Chang'an City, but at that time, the real coordinate system and the accuracy of longitude and latitude were missing, and the curvature of the earth was not taken into account, or the situation that the Hongwen Museum drew a map of Chang'an for a long time.

It's just that the map, except for the nearby places such as the Imperial City, is more accurate, and other places that are more than the outside, are no longer accurate.

What's worse is that in the process of drawing, they found that the further out the map became, the more deformed it became, and even became distorted as if it had been pulled away by something, and they couldn't draw a satisfactory map.

But fortunately, the extension of the Hongwen Pavilion did not feel discouraged because of this, looking at the disdain of His Royal Highness the Prince, these people were full of spirit, and began to plunge into, according to legend, Dayu left when he ruled the water: "Left quasi-line, right rules, carry four o'clock, in order to open Kyushu, through the nine roads, Pi Jiuze, degree nine mountains" in the measurement of the essentials.

Some books such as Zhou Ji Sutra and Nine Chapters of Arithmetic were all borrowed by Yan from Guozijian of Hongwen Pavilion, and Shangguan Yi at that time was so frightened that they could borrow them, but they must not be damaged.

Rushing into it, Yan, who was bound to make His Royal Highness the Crown Prince look at him differently, was like a wolf and a tiger, just nodding his head blindly yes, only how to draw a perfect map in his mind, how could he have the heart to take Shangguanyi's advice to heart.

But fortunately, when Shangguanyi saw those books again, he was relieved, fortunately, nothing was damaged, but there was a copy on it, obviously in the handwriting of His Royal Highness the Prince, and four words were written: "A group of fools!" ”

When these Hongwen Pavilion Yan, like defeated roosters, drooped their heads to see Li Hong, they saw a round wooden ball placed in front of His Royal Highness the Prince.

Holding a piece of paper in his hand, on which were written some words that no one could read: "Jianyi", "Gaobiao", "Yangyi", "Liyunyi", "Hanging Zhengyi", "Zazhengyi" and other inexplicable words, handed to a Hongwenguan Yan.

Then Li Hong personally selected more than a dozen Hongwen Pavilion Yan from these observations, and asked these people to take the paper and the wooden ball to Li Chunfeng, and agreed that within ten years, if they can thoroughly understand and draw a satisfactory map, each of them will be crowned as a Tang Dynasty official of the fifth grade!

This promise made the Yan people naturally overjoyed, but when they heard that His Royal Highness the Crown Prince said ten years later, everyone also realized that this mapping was by no means as simple as it had been since they had been studying it during this time.

When they came to Taiyi Mountain with the paper and the wooden ball, and handed everything in their hands to Li Chunfeng, Li Chunfeng looked at it for a long time, but he didn't understand.

Yuan Tiangang took the ball and looked around, joking at those Yans: "Who drew it on this?" What is this? ”

But when he continued to inadvertently turn in his hand, and saw a place on the top of the ball that was not like a painting or a picture, and the word Chang'an was written on it, he was so frightened that he threw the ball to the ground!

Li Chunfeng, who was startled by Yuan Tiangang's ghostly appearance, curiously picked up the ball and looked at it for a long time, and when he muttered the names of places such as Chang'an and Luoyang, he suddenly found that this seemed to be a map!

From that time on, Li Chunfeng led the dozen extensions and plunged into the study of map drawing, from the beginning of not understanding why the map was drawn on the ball, to the end of the frightened and trembling looking at the ball, everyone's face was full of fear and disbelief!

And almost at the same time, His Royal Highness the Prince, who had already gone to Anxi, suddenly sent a secret letter to Li Chunfeng, and even selected nearly 10,000 people from the Prince's six rates for Li Chunfeng to drive.

The content of the prince's secret letter is very simple: "If anyone dares to reveal the truth of the research, there will be no forgiveness!" ”

At the same time, he naturally also informed Li Chunfeng that the use of the 10,000 people to him was that all parts of the Tang Dynasty were sent by him to Hongwen Pavilion.

Li Chunfeng was the secret letter of the crown prince, and he and more than a dozen Hongwen Pavilion were locked up in a remote palace in the Zongsheng Palace for three consecutive days, and it was not until the fourth day that these people walked out of the palace with a resolute look, full of spirit, solemn and solemn. But everyone seemed to have cut off their tongues in the palace, and they didn't talk much, no matter how much Yuan Tiangang asked them how they studied, these Hongwen Pavilion Yan seemed to be deaf and dumb, and no one paid attention to his words.

Whether it was Li Chunfeng or Yan of Hongwen Pavilion, they were completely shocked by His Royal Highness the Prince's secret letter, and at the same time, they regarded His Royal Highness the Crown Prince as a celestial in their hearts.

After all, their research is still imaginary, and when they cut through the clouds and stand on the shoulders of giants and look down on the mountains and rivers, the shock in their hearts is self-evident: "We actually live on a ball where the sun disappears, but we run to the other side of the ball." The sun appeared because it turned back. The ball under our feet is actually turning the stars above G's head, far from being as big as we see, and far from being so close to ourselves, the distance between ourselves and them, the distance between life and death. ”

But all these celestial phenomena that they peeped at, His Royal Highness the Crown Prince did not participate in them, only occasionally asked how the process was, and did not participate in the whole process at all, how did he know that we were in a sphere? And where did you know that on this sphere, the area of the ocean is much, much larger than the land area!

In the past three days, Li Chunfeng took the extension of the Hongwen Pavilion, from doubting life to accepting reality, and then to a dozen or twenty people, motionless in a circle, staring at the pattern on the wooden ball.

In the end, these dozen or twenty people overcame the fear in their hearts and believed that the world would not suddenly let them fall because of the existence of something called the earth's gravity.

Li Hong knows very well that if Li Chunfeng's research is known by more people, who knows if the world will be chaotic all of a sudden, and will it bring fear and panic to the people of Datang because of the fact that people live on a round ball, and then be used by people with intentions to set off various riots in Datang?

At that time, he will really become a sinner of Datang, after all, people's cognition has always been in the concept of leaving the sky and a round place.

When they learn that they are living on a spinning ball, who knows if such a fact will make them think that one day they will fall into the abyss?

Therefore, for the sake of the stability of the Tang Dynasty, Li Hong firmly locked all this in the mouths of those dozen or twenty people when he estimated that it was about the same!

That is, from that day on, these talents gradually mastered more subjects such as astronomy, astrology, geometry, mathematics, drawing, etc., and from that day on, the path in front of them was completely contrary to the people of this era, completely beyond the thinking of this era, and was alive by Li Hong in this field, more than a thousand years in advance!

"Your father told me last night that he now feels that his body is not as good as before, and his energy is getting worse and worse. originally hoped to use this royal driving expedition to prove that he was in the heyday of the Spring and Autumn Period, but who knows, this royal driving expedition made him completely lose confidence. I'm talking to you, what are you thinking Li Hong! Wu Mei raised her head and looked at Li Hong, who was looking at the map in a daze, posing with one eye closed and gesturing with an inexplicable gesture just now, and was so angry that she knocked on Li Hong's shoulder again.

"Ahhh I'm Jack, this map isn't bad, right? ”

[Remember the URL . 三五Chinese网]