Li Tianjing suddenly looked slightly surprised. Kong Youde was very happy when he saw it. It seemed that he had successfully fooled Li Tianjing and planned to understand.

However, Li Tianjing said, "Of course I know what the earth is, but General Kong, where did you know it? I'm very curious?"

Kong Youde was also surprised. The old man knew that he was afraid he was not fooling him. Then he asked with a disbelief expression, "Then, what is the earth?"

"The earth under our feet is in the shape of a ball, which means that we live on a ball, and this ball is called the earth." Li Tianjing didn't go around the corner and said it directly. Magellan completed a circumnavigation of the world more than a hundred years ago. Li Tianjing had contacted many Europeans, so he naturally knew that the earth was round.

Now it was Kong Youde's turn to be depressed. Unexpectedly, Li Tianjing knew. Although he didn't know why he knew, he was still unwilling to accept it. "Where did Lord Li know?"

"There was no such word before the Ming Dynasty. This word was proposed by Xu Ge Lao. It comes from the book "Theory of the Operation of the Celestial Body". It was a book written by the barbarian Copernicus. You don't understand it even if you say it. It translated into my Ming Dynasty, "Earth". I think the translation is extremely clever, but what I am more curious about is how you know."

Li Tianjing said quietly, staring at Kong Youde tightly as he spoke, as if there was a flower on his face.

Kong Youde was stunned at that time. After a long time of work, the word "earth" was mentioned at this time. He failed to show off. He asked himself that he still had to fool him.

"I heard from Sun Junmen. Sun Junmen often discusses these things with people. I have heard this word, so I wrote it down." Kong Youde said haha.

Li Tianjing still stared at Kong Youde and said, "You are lying. The word 'earth' was translated last month. I only found out a few days ago that Sun Chuyang is a student of Mr. Xu. It is normal for Mr. Xu to tell him through a letter, but you had already left Dengzhou a month ago. How can you listen to Sun Chuyang mention it?"

When Kong Youde saw that it was impossible to go through, he simply ignored it and acted as a fool. "Mr. Li doesn't need to worry about this. Anyway, I know. Does Master Li know how the five stars of gold, wood, water, fire, and earth move?"

Li Tianjing thought Kong Youde didn't understand these, so he was curious to ask himself for advice. He was surprised, so he went back in detail, "These five stars are circled around the sun, and the arrangement is not gold, wood, water, fire and earth. According to the distance to the sun, they are Mercury, Venus, Mars, Jupiter, and Saturn. Since you are so interested in these, it is better to stop rebelling and accept court admonition. I and Sun Chuyang will keep you safe and sound, and then you can recommend you to learn these from Master Xu, who knows more."

Li Tianjing turned back to the main topic. After all, he saw Kong Youde mainly persuaded him and accepted the counsel. Although he was taken a deviant from the scene as soon as he came in, he continued to persuade him whenever he had the chance. Seeing Kong Youde so interested, Li Tianjing felt that he would probably succeed.

Kong Youde was instantly lost. Why did Li Tianjing know so much? This is wrong, and it seems that he doesn't understand. Come and ask him for advice. Kong Youde still doesn't give up and cannot throw away the face of a time traveler.

"Then let me ask another question, Lord Li, do you know the diameter of the earth, the moon, and the sun?"

Although this old man knows a lot, his current scientific level should not be able to measure these, so he is not worried that Li Tianjing will know.

"The word diameter was also translated by Mr. Xu. Do you know it too? I don't know the answer to your question. Maybe Mr. Xu knows it. If you want to know, accept the pleading and study with Mr. Xu." Fortunately, there was no accident this time. Li Tianjing admitted bluntly that he didn't know, but he still did not give up persuading Kong Youde to accept the pleading.

Kong Youde knew that the time for his performance was up. "Does Xu Ge Lao know I don't know, but I know."

Li Tianjing looked at Kong Youde with disdain and bragging, "What Mr. Xu doesn't necessarily know, how can you, a general, know?"

"The diameter of the earth is about 25,600 miles, the moon is about 7,000 miles, and the diameter of the sun is 2,800,000 miles."

Most modern people have a general understanding of these, which is not so accurate, but not much is bad, so it is normal for Kong Youde to know.

After Kong Youde finished speaking, he waited for Li Tianjing to bow to him. However, beyond Kong Youde's expectations, Li Tianjing looked at him suspiciously.

"How did General Kong know this? Could it be that he was nonsense? How did you measure it? And how did you prove that you were right?"

After this series of problems, Kong Youde was a little confused. Why was it completely different from what he thought? If you want to talk about how to measure it, Kong Youde really didn't know. Maybe he learned it when he was in school, but after so many years, he had forgotten it and could not prove it at all.

"I don't know how to test this, but I know the result. If you don't believe it, I will see if I know a few astronomy and geography problems."

Li Tianjing still looked disdainful. Maybe Sun Yuanhua often discussed these things with people, so Kong Youde listened to them, and then bragged about it. However, in order to comfort him, he still asked a question. "Do you know what solar eclipses and lunar eclipses are going on? Do you know how to calculate the birth time?"

"The moon revolves around the earth, the earth revolves around the sun, and the moon revolves between the earth and the sun. Blocking the sun's light is a solar eclipse. When the moon revolves around the earth, another position opposite to the sun is a lunar eclipse. I don't know how to calculate it, the calculation is too large."

Li Tianjing keenly captured a sentence: the earth is revolving around the sun. He also noticed a detail. When Kong Youde said this, he blurted out without hesitation. He didn't feel like he was making a fool of himself. He was just saying something that had been born.

This sentence touched him a lot. Xu Guangqi and Xu Ge Lao are revising the calendar now. Many calculated contents, such as solar eclipses and lunar eclipses, are somewhat different from the real situation. In fact, these deviations are not big, that is, the time when the solar eclipse or lunar eclipse is born or ended. It is too early or after a short time, it may be less than a cup of tea.

At first, he thought it was because of the lack of rigor in the calculations. Xu Guangqi, due to the qualities of a scientist, repeatedly calculated and verified it again and again, but there was still deviation. Li Tianjing also knew about this, and he knew a lot about it. He also tried to calculate it himself, and the situation was the same, so he just wanted to understand where the problem lies.
Chapter completed!