Chapter 478: Astronomical Discussion

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

Su You asked, "What's the problem?" ”

Chen Zhaoming said: "This meridian is the meridian, as far as the north and south are concerned, the ancients had a conclusion, called 'the shadow of the sun is an inch, the difference between the earth is a thousand miles'." ”

"This said that everyone doubted the calendar of the past dynasties, and then the monks of the Tang Dynasty and his entourage, using the zodiacal travel instrument, the water transport armillary sphere to measure the states, the North Pole height difference of one degree, the distance between the north and south is 350 miles and 80 steps."

"With the theodolite, with the speculum mirror, and with the finer measurement of Meishan, I counted the data of the Heavenly Master's Dao observations, and found that this one-degree altitude difference is the length of one degree on the meridian, and the total should be one hundred and thirteen kilometers."

Su You's mouth opened wide.

"There is also the latitude, through statistics, we assume that if the turtle's back is true, then the latitude can be regarded as a part of the circle, so the further north, the smaller the diameter of this circle!"

"The longest weft is the equator of the earth!"

"I have been observing for several years, combined with the classics of my predecessors, and found that there is an angle between the equator and the ecliptic, and this angle, measured by Meishan, is 23 degrees and 20 minutes."

After speaking, Chen Zhaoming pointed to the two foreigners: "And them, they are from Dashi." In the west of the Great Food, there is still Daqin, whose land is not far away, and I heard that there is still a country in the west. ”

"Plus our side, Tubo, Western Xia, the territory of this dynasty, Liaodong, Korea...... According to the calculation of latitude and longitude and distance, the earth beneath our feet may, or, is, ......"

"What?"

"It's a 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 stupid: "Say...... What does it mean? ”

It can be seen that Chen Zhaoming is very distressed: "If this is the case, why do people by the sea feel that they are upright?" Or is the earth like a magnet ball, and all things like iron sand? The weight direction of the iron sand is pointed to the center of the ball? At last, I thought it was incredible, but that's how the actual measurement and estimation is, that's how it is......"

Su Xiaomei hurriedly and secretly pulled the corner of Chen Zhaoming's clothes.

Su Song also explained: "My disciple is like this, once he falls into thinking, he doesn't care about the occasion. But the quality is good, and there is no meaning of making things difficult and clear. ”

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

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

After speaking, he pulled Chen Zhaoming's sleeve: "Ignore him, let's go!" ”

Su You hurriedly jumped up and grabbed Chen Zhaoming: "Hahahaha, it's really a wonderful idea!" Make bold assumptions, deduce carefully, and confirm step by step. Whether it's right or wrong, it's a gain. ”

"Little Seventh Brother, set up a banquet and entertain the wizards!"

The main dish is bacon stewed radish, the Su family is a maverick, everyone sits at a big round table, and Shi Wei's little sister is not shy about it.

Since the topic is astronomical, everyone is free to discuss it according to their own knowledge system.

The knowledge of the Wisdom Palace made Su Song and Chen Zhaoming feel a little surprised, the method of calculating the circumference of the ecliptic through the shadow of the sun was mediocre in the eyes of the two, but the Yi people also knew that it was an outstanding Yi people.

The division of constellations is also different from that of Middle-earth, but it also has its own system, called astrology, and the constellations recorded by the "Dacheng of Astronomy" and subsequent astronomers are no less than those in the Chinese "Butian Song".

Su Song was very interested in this, and was going to take the two foreigners to Si Tianjian to see the armillary sphere and see if there was anything to add.

Then we talked about mathematics, the volume of the sphere is similar to the Eastern and Western ideas, but the solution is 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 view, the solution to the west is more concise and clear.

Several major civilizations are near 37 degrees north latitude, and the celestial phenomena are almost the same.

Although Su Song and Chen Zhaoming both praised the knowledge of the Wisdom Palace, Kuro and Elp were pale, and the few people in front of them were not professional academics, and their main positions were all officials in the Great Song Dynasty, one was the emperor's secretary, the other was the local governor, and the other was ...... Royal Librarian.

I heard that the Great Song Dynasty didn't take these tests, they took the literature test, and these were just things to play with when they changed their brains and relaxed.

Everyone's knowledge is above the master of the Wisdom Palace!

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

After eating, let the foreigner go to rest first, and Su You and Su Song drank tea and talked.

Su Song then remembered the matter: "Every time I come to talk about academics, I forget about business, where Mingrun will go after returning to Beijing, do you have any intention of arranging?" ”

Su You said: "I don't know, I'll go to Liunequan tomorrow to report, and then go to the political hall to visit Zhang Zhao and the others." ”

Su Song said: "Father Zhang Ding is worried. ”

"Huh?" Su You has been chatting with Wang Anshi on the boat, and he really doesn't know this.

Hearing that he was walking with Wang Anshi, Su Song frowned: "Mingrun, Wang Jiefu has returned to Beijing this time, and the imperial court may be of great use, but you are ...... 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 resisted my old cousin, I have no prejudice against him. ”

"Anyway, when we broke up, I told him that in the future, above the court, I will follow the example of the four gentlemen of Qingli and fight for the country, not as good as personal friendship. As for what others think, I can manage so much? ”

Su Song breathed a sigh of relief: "It's good not to be subordinate, Sima Junshi is impeached for nothing, Zhang Gongding is worried, he has also lost his position to advise, by the way, what do you think of "Zizhi Tongjian"? ”

Su You lied: "I haven't seen it, where is the repair?" ”

Su Song said: "The article is good, it has been repaired to the Warring States period Su Qin Zhangyi, this name is still given by the official, and it is very important." ”

Su You sneered: "The name given by the official family is amazing?" In a few days, I'll ask the official family to give four! ”

The efficiency of the Song Dynasty was very bad, and Su You went to several places to report the next day, and after visiting the bigwigs, he went to Zhengzhou.

The two hundred Hoarding Army did not withdraw, and Su Chihuo continued to be stationed in the school field.

A few large wooden boxes, under the cover of night, were quietly transported here by boat.

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

A young man in a purple robe got out of the carriage, and he was full of spirit: "Mingrun, I miss my brother to death." ”

Su You stepped forward to salute: "Xiaguan Su You, see the Jiedu envoy." ”

The person who came was Uncle Gao Guo, and now he has been awarded the title of Qinzhou Festival Envoy because of the great victory in Weizhou to supply military supplies.

The young man took his arm: "More and more outside." ”

After speaking, he said in a low voice: "The official family is also here." ”

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

Uncle Gao Guo grabbed him: "Don't care, just show me the artifact drill." ”

Su You shook his head: "Don't cry when you see it." ”

After saying that, wave the red flag.

Su Chihuo commanded a team to operate from a distance, and the group observed the parameters through the theodolite, read the values, and let the team make adjustments.

Then he personally doubled and told everyone to hide behind cover and pull the drawstring.