Chapter 478 Astronomy Discussion

Chen Zhaoming said: "Taichang Temple is still studying the idea of ​​Teacher Kyushu's turtle back theory, but there is a problem."

Su You asked: "What's the problem?"

Chen Zhaoming said: "This meridian is the longitude. As far as north and south are concerned, the ancients concluded that 'the shadow of the sun is an inch, and the difference of the land is a thousand miles.'"

"Everyone in the past dynasties has doubted this theory. Later, monks in the Tang Dynasty used the ecliptic traveling instrument and the water-borne armillary sphere to measure the various states. The height difference in the North Pole was one degree, and the distance between the north and the south was 350 miles and 80 steps."

"With the theodolite, the sky-gazing mirror, and the more precise measurement of Meishan, I counted the data from Tianshi Dao observations and found that this one-degree height difference is the length of one degree on the meridian, and the total is one hundred and thirteen

km."

Su You opened his mouth wide.

"There are also latitude lines. Through data statistics, we assume that if the Turtle's Back Theory is true, then the latitude lines can be regarded as part of the circle. Then the farther north, the smaller the diameter of the circle!"

"The sky corresponds to the earth, and the longest latitude is the earth's equator!"

"I have been observing for several years, and combined with previous books, I have discovered that there is an angle between the equator of the sky and the earth and the ecliptic. This angle, measured in Meishan, is twenty-three degrees and twenty minutes."

After speaking, Chen Zhaoming pointed to the two foreigners: "There are still them, they are from Dashi. To the west of Dashi, there is Daqin, which is not far away thousands of miles away. I heard that to the west, there is a country."

"Including our side, Tubo, Xixia, the territory of our dynasty, Liaodong, and Korea... Based on the calculations of longitude, latitude, and distance, the ground under our feet may, or may, actually be..."

"What?"

"It's actually part of a sphere! The circumference of the equator is 80,000 miles, and the angle between the center of the circle and the east and west ends of the earth is more than 120 degrees!"

Su You was dumbfounded: "Say...what does that mean?"

It can be seen that Chen Zhaoming is very troubled: "If this is the case, why do people on the beach feel that they are upright? Or is the earth like a magnet ball and everything is like iron sand? The direction of the weight of the iron sand points to the center of the ball?

In the end I thought it was unbelievable, but the actual measurement and calculation is like this, it is like this..."

Su Xiaomei quickly and secretly tugged at the corner of Chen Zhaoming's clothes.

Su Song also explained: "My disciple is like this. Once he gets lost in thinking, he doesn't care about the situation. But his quality is good and he has no intention of making things difficult for Mingrun."

Su You was excited: "Brother-in-law, right? The Shi family has an apple orchard in Zhengzhou. If you have nothing to do, go lie down under the apple tree and hit the apple on your head, or you will wake up..."

Su Xiaomei was angry: "Brother! Although Jingrun is obsessed with astronomy, he is too smart to be stupid! Why are you mocking him?"

After saying that, he tugged on Chen Zhaoming's sleeve: "Ignore him, let's go!"

Su You quickly jumped up and grabbed Chen Zhaoming: "Hahahaha, it's really a wonderful idea! Make bold assumptions, be careful with inferences, and verify it step by step. No matter whether it's right or wrong, it's all a gain."

"Brother Xiao Qi, set up a banquet with wine and entertain the wizards!"

The main course is bacon and radish stewed with bacon. The Su family is unique, so everyone sat at a big round table, and little sister Shi Wei didn't shy away from it.

Since the topic is triggered by astronomy, everyone can discuss it freely according to their own knowledge system.

The knowledge of the Palace of Wisdom surprised Su Song and Chen Zhaoming. The method of calculating the ecliptic circumference through the sun's shadow was ordinary in their eyes, but the Yi people also knew that it would be considered an outstanding Yi people.

The division of constellations is also different from that in China, but it also has its own system, called astrology. The constellations recorded by "Almagest" and subsequent astronomers are no less than those in the Chinese "Bu Tian Ge".

Su Song was very interested in this and planned to take the two foreigners to Sitian Prison to look at the Armillary Sphere and see if there was anything to add to it.

Then we talked about mathematics. The volume of a sphere is similar in Eastern and Western thinking, but the solutions are different. One is to turn the ball into a cylinder minus a cone, and the other is to turn the ball into a square cylinder minus a square cone.

But in Su You's opinion, the solution in the west is simpler and clearer.

Several major civilizations are located near 37 degrees north latitude, and the celestial phenomena are similar. Everyone learned from each other's strengths and had a lively chat.

Although Su Song and Chen Zhaoming both praised the knowledge of the Wisdom Palace, Kuro and Alp looked pale. I heard that the few in front of them were not professional academics, and their official positions were officials in the Song Dynasty government. One was

The emperor's secretaries, one is the local governor, and the other is...the royal librarian.

I heard that those who became officials in the Song Dynasty did not take these exams. Instead, they took the exam on literature. These were just things for fun when they relaxed their minds.

Everyone’s knowledge is superior to that of the Master of the Wisdom Palace!

No wonder the Messenger of Allah said that even though wisdom is far away in China, it is still required!

After dinner, the foreigner was asked to rest first, while Su You and Su Song drank tea and talked.

Only then did Su Song remember the business: "Every time I come here to talk about academics, I forget the business. Do you have any plans for Mingrun's whereabouts after returning to Beijing?"

Su You said: "I don't know either. Let's go to Liuneiquan to report tomorrow, and then go to the Political Hall to visit Zhang and Zhao."

Su Song said: "Master Zhang and Ding's father are worried."

"Ah?" Su You had been chatting with Wang Anshi on the boat, and he really didn't know this.

Hearing that he was traveling with Wang Anshi, Su Song frowned: "Mingrun, Wang Jiefu's return to Beijing may be of great use to the court, but you are traveling with him..."

Su You said: "It's not that I walked with him, but that he waited for me for three days. I admire the prince's knowledge and conduct. Although I have always been at odds with my old cousin, I have no prejudice against him."

"Anyway, I told him when we broke up. From now on, in the court, I will follow the example of the Four Gentlemen of Qingli. Fighting for the country is not as important as personal friendship. As for what others think, do I have so much control?"

Su Song breathed a sigh of relief: "It's not just a matter of subordination. Sima Junshi's impeachment was in vain. Zhang Gong and Ding You, he also lost his position of admonishment. By the way, what do you think of "Zi Zhi Tong Jian"?"

Su You lied: "I haven't seen it. Where has it been repaired?"

Su Song said: "The article is good. I have studied it to the level of Su Qin and Zhang Yi in the Warring States Period. This name was given by the officials, so they value it very much."

Su You sneered: "The names given by the officials are amazing? I will ask the officials to name four of them in a few days!"

The Song Dynasty's work efficiency was very poor. Su You went to several places to report the next day, and after visiting the bosses, he went to Zhengzhou.

The two hundred troops did not withdraw, and Su Chihuo and his troops continued to be stationed at the school grounds.

Several large wooden boxes were quietly transported here by boat under the cover of darkness.

Su You began to make preparations. A few days later, a small team quietly arrived, led by Wang Zhongzheng and Li Xian.

A young man in purple robe got out of the carriage and said with high spirits: "Mingrun, I miss my brother so much."

Su You stepped forward to greet him and said, "I am going to lower my official position, Su You, and see Jiedushi."

The person who came was none other than Uncle Gao Guo, who had now been granted the title of Military Envoy of Qinzhou due to his great contribution in supplying military supplies during the great victory in Weizhou.

The young man took his arm and said, "I'm getting more and more exposed."

After speaking, he whispered: "The officials are here too."

Su You looked around Wang Zhongzheng's team: "Where?"

Uncle Gao Guo grabbed him and said, "Don't worry about it. Just show me the magic weapon drill."

Su You shook his head: "Don't cry after seeing this."

After speaking, wave the red flag.

Su Chihuo directed a team to operate from a distance, while Zhong Yi observed the parameters through the theodolite, read the values, and asked the team to make adjustments.
Chapter completed!