"Yes, Master, if you can, please give me a map that is accurate enough, and a map that covers the universe." Lu Xun thought for a while and said, "Let me remember the entire memory in my heart, and use my future life to measure and verify it."

Chen Xi couldn't help but sigh when he heard this. Should he say that he is worthy of being Lu Xun? This mentality and this ideal are really great. But in the universe, no one has really owned the entire universe's accurate map. The so-called world map is worthy of the current human range. In the universe, if you look up at the dazzling galaxy, that is in the universe.

"Okay, I'll use a scale to draw you with precision and terrain." Chen Xi suppressed his desire for the starry sky and narrowed the map to the world. In this way, what Lu Xun wanted would not be so difficult, at most it would be a bit troublesome, but there was still half a year before he got married, and Chen Xi still had time.

What's more, after Lu Xun mentioned this, Chen Xi remembered that while he could still remember the relatively detailed world map, he should combine all the maps in advance to create an accurate and usable map as a base.

"Thank you, teacher." Lu Xun said happily. He really wanted to see how huge the world is.

"Well, I'll write a reply for General Huangfu first, and I'll take you there tomorrow." Chen Xi smiled and said, "You'll wait here first. I'll write a reply for my old housekeeper to send it there."

Lu Xun nodded, and Chen Xi went to the study first. When Chen Xi came over again, the stone table was filled with all kinds of snacks. Lu Xun sat aside with some restraint, while Cai Yan sat on the other side, and Chen Ying was accompanying him.

"Well, it's rare." Chen Xi was a little surprised when she saw Cai Yan appear. To be honest, since the previous year, Cai Yan has come to Chen Xi less and less frequently. After the second lady had Yang Hu and Yang Huiyu, Cai Yan basically stopped coming to Chen Xi's side.

"I want to ask for some questions." Cai Yan held the teacup in his hand and said calmly and without any ups and downs, which can be regarded as an explanation for those who are not here.

"What's the problem?" Chen Xi asked in confusion. Generally, Cai Yan would solve problems by himself. In the past, if Cai Yan had any problems, he would seek answers from Chen Xi. Now, this is no longer necessary.

"The Gan family in Moling has brought a bunch of things and come to me to ask for an answer." Cai Yan said calmly and coldly.

"Ha, you actually do such a thing?" Chen Xi said with a look of surprise. He had never heard of Cai Yan's hobby of answering questions. It was a bit strange to collect things and answering questions.

Upon hearing this, Cai Yan naturally glanced at Chen Xi with cold eyes. There was no other meaning, but it still made Chen Xi a little embarrassed.

Fortunately, before Chen Xi could speak, Cai Yan had already explained to Chen Xi, "It was not that I received the things to give the other party an answer, but that I would help others solve some academic problems. As for whether it is a standard answer, I can only say that it is based on my knowledge reserve."

"..." Chen Xi had nothing to say. Cai Yan seemed to have no idea. It was just because of her own identity that it was difficult for anyone to study at her. However, if you usually come to the door, as long as it was a purely academic question, Cai Yan seemed to give him an answer.

"What's the reason for this time?" Chen Xi put Cai Yan's answer aside after a while, and then asked.

"The Gan family in Moling was divided due to a problem. In order to avoid the family being divided, the head of the Gan family, Gan Fen, sent the problem to me, hoping that I can give you an answer." Cai Yan said with a little sleepiness.

Chen Xi looked at the sleepy look on Cai Yan's face and couldn't help but feel a little strange. Cai Yan still pays great attention to appearance in front of others. This obviously sleepy look was simply unimaginable to Chen Xi. Is there something wrong with this?

"It's so strange, why did you ask for your place?" Chen Xi asked in confusion.

"Because I know the most about academic knowledge on the surface, and I look more idle than some people." Cai Yan said without any haste.

Chen Xi scratched his cheek, not knowing what to say, but that's right. The academic thing on the surface is indeed Cai Yan, who is standing at the top of the list. The key to the library library is hanging around Cai Yan's neck, and Cai Yan himself is equivalent to a library.

It is said that if any powerful man married, he can transform into a family in three generations. Then, relying on the large number of classics brought by Cai Yan, it is enough to pile up the entire family into a scholarly family.

Unfortunately, Cai Yan had no idea of ​​getting married at all. Cai Yan relied on Cai Yan to beat the Cai family alone. If Cai Yan didn't mention marriage outside, there would be no way for other aristocratic families to be interested.

"What's the problem?" Chen Xi scratched her cheek and asked awkwardly, "Speaking of it, can't you solve it?"

Cai Yan has good qualifications, and has spiritual talent and spiritual talent. With the feeding of Chen Xi's large number of classics, it is indeed very good in academics. In theory, the current social environment cannot be stumped by Cai Yan unless it is a philosophical problem.

"The earth we stand on is round, right?" Cai Yan said slowly.

"..." Chen Xi's eyebrows trembled when she heard this, and she didn't say anything. However, Lu Xun was completely stunned and his mind was in chaos.

"Uh, is this what you asked, or..." Chen Xi thought for a while, decided to think about what was going on, and then answer.

Although people in the Spring and Autumn Period and ancient Greece suggested that the earth under their feet was a ball, neither side proved it.

After about the Warring States Period, Gande and Shishen inferred from the formation of the lunar eclipse that the earth was a ball. At the same time, Aristotle of the ancient Greeks also inferred that the earth was a ball based on this. However, both sides believed that the earth was a ball, so how could the earth be a ball?

So both sides only mentioned this guess in their own classics, and then stopped talking about it. The evidence was only one lunar eclipse. From this perspective, the group of people in the past two thousand five hundred years was indeed extraordinary. After all, both sides had a group of actual founders of civilization.

Later, the Central Plains really proposed that the earth was a ball, Luo Xiahong of the Western Han Dynasty, and directly went to Huntian theory, but Luo Xiahong could not really let this theory develop. Although it was proposed, it did not get the recognition of the mainstream society at that time.

It would be terrible to come to Zhang Heng again. Huntian Theory and the Armillary sphere directly explained many astronomical phenomena in the Earth-Moon System and the Solar System at that time, which made Huntian Theory really begin to overwhelm the Gaitian Theory.

However, Zhang Heng himself could not explain why he didn't roll down if the earth was a ball. In addition, Zhang Heng's conditions at that time could not calculate the area and circumference of the ball, so although Huntian said that he explained a lot of things, he just couldn't completely kill Gaitian.

As for the current Three Kingdoms period, Huntian said that he had already gained an advantage, but Huntian said that there was a big problem that he could not explain the problem of the ball, because although Huntian said that he was popular, he was really sure that there was a ball under his feet.

Now Cai Yan asked, from this tone, someone should have certain evidence.

"The Gan family and the Gan family in Moling raised questions. Some people in their family relied on moving the target on the sea to calculate the limit of the visual range and calculate the circumference of the earth. They thought there was a ball under their feet!" Cai Yan said helplessly, and then took out a stack of conclusions from the cuffs filled with calculation methods and various verification results.

"What's the conclusion?" Chen Xi said with a big head. He had known for a long time that there were some monsters in the Central Plains that were difficult to deal with. Well, I really encountered this wave.

In fact, this cannot be blamed on Chen Xi. When I was on land, it was difficult for the ancients who were fixed in one place to reach the conclusion that the earth was a ball even if they had the knowledge accumulated by generations. As a result, last year, Zhou Yu brought a group of people from astronomy, astrology, Feng Shui, and geomancy to the ship and went south. These people almost started fighting on the ship.

Needless to say, the Gan family was dissatisfied, the Chen family was not happy, and the Wang family was also shady. In the end, this matter was exposed, but when the three families returned home, they directly started the family research mode. However, the Gan family spent the most money and chose the right method. It took only half a year to get the result. Then, for this result, the Gan family started fighting internally.

"The circumference calculations are the latest data calculated by Zhao Junqing. Gan Fen took the Gan family in Moling to test it for two months on the sea. Finally, he determined that the earth under his feet was a ball, and the value would be larger the further south. According to their calculations, the maximum circumference of the earth under his feet was changed to the latest unit, which was 40,000 kilometers." Cai Yan handed Chen Xi the calculation paper sent by the Gan family.

Chen Xi was silent. This data was actually very different from the data in his impression. It should be said that this family is worthy of being a profession.

Looking at the calculation data in his hand, Chen Xi was extremely impressed, and a large amount of actual measurement data was noted on it. In order to avoid mistakes, he even conducted several actual measurements in the same place. After removing some unexpected data, he took the average value for calculation.

There are several ways to calculate, such as shadows in different regions of the same time and height, the visible distance of the horizon on the sea surface, and even such as asking immortals to use nearly laser-like light spells, and then the ship stays away from the sea surface, calculates the height where the straight ray rises as the ship scales away, and the last data is the last data.
Chapter completed!