The content of Meng De's conversation with Wang Yan was written by Wang Yan into a notebook and handed to Zhao Huan.

He closed the notebook and could only sigh.

For the sake of the generals of the Great Song Dynasty, he left enough back roads, but unfortunately the generals of the Great Song Dynasty never paid attention to the back roads he left for them.

Wang Yu was like this at the beginning, and now it is the same with Wang Yan.

"Official, tomorrow is the Shangyuan Festival, and Liu Yi has returned to Beijing." Zhao Ying saw that the interest of the official family was not high, and said good news to the official family with a smile.

"Oh?" Zhao Huan raised his interest.

Liu Yike said that he wanted to measure the vastness of the earth, but no one believed it, but Zhao Huan believed his words.

When Zhao Huan saw Liu Yi, Liu Yi came to see him with an instrument in his hand.

"The official family is Antai. Chen Liu Yi has seen the official family. Liu Yi looked at the heroic Zhao Huan and saluted and said.

Zhao Huan motioned to Zhao Ying to move a stool for Liu Yi and said, "Hurry up, please get up." What is it? ”

"This is the armillary sphere on the elephant platform of the water transport instrument, invented by Li Chunfeng of the former Tang Dynasty, and this is how it is dismantled, do you still remember the official family?" Liu Yi looked at the official family and said with a smile.

Zhao Huan nodded, of course he remembered this armillary sphere, and the water transport instrument elephant platform was now reporting the time to the people of Bianjing.

Of course he remembered it.

"The official family is the armillary needle of the armillary sphere, and the armillary sphere can move with the sun from time to time. The muddy needle can always point at the sun. Then at night, the armillary sphere was still turning, and the armillary needle was pointing to the ground. Liu Yi smiled and pointed to the armillary sphere and said.

Zhao Huan nodded, the needle can point to the sun, but at night, the needle points to the ground.

He knew why this was the case, and he had told Li Gang about it at that time, saying that the sun was underground.

Li Gang also said that the sun is bright and brilliant, and Aneng is silent in the nine secluded secluds?

Now it seems that Li Gang probably handed over this matter to Liu Yi to do.

Liu Yi said with a smile: "The official, the minister traveled this time, and he said that the chaos was completed. ”

"I don't know if the official family has ever heard of such a saying, the sun shadow is an inch, and the land is thousands of miles away? That is to say, at the same time, the shadow of a pole of the same height, if it is one inch apart, the difference is thousands of miles? ”

Zhao Huan pondered for a long time, he really hadn't heard of this statement.

[Reminder of historical events: The shadow of the sun is one inch, the difference is thousands of miles, it is two places in the north and south on the same meridian, at noon on the day of the summer solstice, the length of the measured shadow is one inch apart, then it means that the two places are one thousand miles apart. 】

Zhao Huan nodded, the system reminded him, and he smiled and motioned for Liu Yi to continue.

"The monks of the former Tang Dynasty and his entourage have been busy running for many years, specially using the zodiacal travel instrument and the water transportation armillary sphere in about thirteen places in the Tang Dynasty, measuring the sun shadow by one inch, and the distance between north and south is 351 miles and 80 steps."

"The minister is counting this when he goes out this time, the sun shadow is one inch, and the accuracy should be three hundred and eleven miles and thirty-two steps."

"Forget the other stuff."

Liu Yi took out the notebook from his sleeve and handed it out.

Zhao Huan opened it and looked at it, and found that it was not a lot of formulas, or a lot of calculation processes, just a simple summary.

But it was this summary that made Zhao Huan's breathing gradually worsen.

[Steps from the east pole, as for the west pendulum, two hundred and thirty-three thousand five hundred miles and seventy-five steps. He also made the south pole and the north end of the north to hang down, 233,500 miles and 75 steps. 】

[Within the four seas, it is 8,000 miles from east to west, 6,000 miles from north to south, 8,000 miles from the water, and 8,000 miles from the water. 】

Zhao Huan is not a person who does not learn and does not know how to learn, he still knows that the ancient 100 million does not refer to the 100 million of later generations, and the ancient 100 million refers to 100,000.

The real meaning of 100 million should be 10,000.

Zhao Huan crossed his fingers and counted for a long time, the content in Liu Yi's notebook was about 46,000 kilometers long.

【History... Mathematical data reminder: The length of the equator is 40,076 kilometers. 】

Within the four seas, in fact, it is the territory of the Song Dynasty, which is about 5,600 miles from east to west, north and south.

Zhao Huan finally understood what Liu Yi was in this notebook!

It's just that Zhao Huan looked at that sentence, and made the south pole and the north end of the north to hang down, 233,500 miles and 75 steps.

Zhao Huan fell into confusion, what does this mean?

The system didn't jump out of the translation.,It seems that it's entered the knowledge blind spot of the system again.,This system is really as waste as ever!

Liu Yi looked at the confused expression of the official family and asked, "The official family, that is to say, the earth under our feet is actually a round ball with a circumference of 233,500 miles and 75 steps......

Zhao Huan nodded, after Liu Yi's Sanskrit sound, he finally understood all the content on Liu Yizazi, what he wanted to express was that the earth was a ball.

Zhao Huan looked at Zazi with a puzzled face, although there is a big gap in the data, but at least the earth is a ball.

Just how is it calculated?

Liu Yi also knew that his speech was a little bold, the earth is the earth, how can it be a ball?

Liu Yi looked at the puzzled expression of the official, he knew his own business, and he was afraid that he would mess up.

He is a mathematician, and he is strong in arithmetic, but he is very unfamiliar with this court.

Liu Yi said a little at a loss: "Official, the minister is not talking nonsense, the minister's statement is well-founded." ”

"In the former Han Dynasty's "Zhang Heng Armillary Notes", it is said that the armillary sky is like a chicken. The celestial bodies are round like projectiles, the earth is like a chicken in the middle yellow, and it lives alone in the sky, the sky is big and the earth is small. There is water in the sky, and the sky envelops the earth, and the shell is yellow. Heaven and earth stand on their own air. ”

"The "Astronomical Chronicles" of the former Tang Dynasty also mentioned this point of view, saying that the rate was five hundred and twenty-six miles and two hundred and twenty-seven steps, and this point of view was also mentioned in a notebook left by Su Song.

Zhao Huan looked at Liu Yi and said a lot, and then he probably understood what Liu Yi wanted to say.

In fact, Zhao Huan probably understood what Liu Yi's rhetoric meant.

This involves an ancient astronomical controversy, the controversy between the Gaitian theory and the armillary theory.

Gai Tian said, about the sky is round like a cover, the place is like a chess game, the sky is like a lid on the ground, and the earth is like a chessboard, placed on the ground.

Hun Tian said that the sky is an egg, and the stars of Zhou Tian are distributed on the egg shell, and the earth is the yolk.

Only then did Zhao Huan know that Liu Yi misunderstood his doubts, he actually wanted to ask Liu Yi how he got this length, not to question that the earth was a ball.

As a result, Liu Yi explained to him the controversy between the Hun Tian Theory and the Gai Tian Theory.

As far as the knowledge system accepted by Zhao Huan is concerned, Hun Tianshuo is actually closer to the truth.

"Liu everyone said that I believe that the earth is a ball." Zhao Huan replied with a smile.

Liu Yi was about to continue to quote scriptures to prove that the earth is a round ball, when he heard Zhao Huan's words, he was stunned for a moment, and said: "Official, do you really believe that the earth is a round ball?" ”

Zhao Huan nodded and said, "Liu, let's tell me how you calculated." ”

Liu Yi bowed his head and said: "After the minister thought that the earth was a ball, he was also amazed, and then on the day of the summer solstice, he measured two places of the same shadow length, that is, Bianjing and Chang'an more than 30 li, with a difference of about seven and a fifth degree, about one-fiftieth of a week. ”

"But there is a difference of three inches between the Qiongzhou Shadow Commander and the Bianjing Shadow Chief, and it is easy to obtain, 233,500 miles and 75 steps."

Zhao Huan couldn't help nodding, it's easy to get!

He couldn't help but think of the three magic weapons of the math teacher in his high math class, which were easy to obtain, the same reason, and proven.

Zhao Huan looked at Liu Yi's expression, and knew that the speed at which he accepted that the earth was a ball was too fast.

After all, in the later generations of the information technology era, there are still a lot of people who believe in the Terra Theory!

"I believe that the earth is a ball because the moon is also a ball."

"Last year, the labor relief supervisor made a model and an enlarged version of the bed crossbow, but it turned out that there was not a single arrow yet. But he sharpened the water essence and sharpened the clairvoyant mirror to come out. ”

"I also burned glass in the Armory for half a year last year. It just so happens that today is the Shangyuan Festival, and the large clairplane of the Great Song Dynasty is ready, let's go and see it together. ”

"The official family agreed that Zhu Guifei would go to the Shangyuan Lantern Festival together this year to guess the lantern riddles, what should I do about this?" Zhao Ying suddenly asked.

If Liu Yi didn't come back on the day of the Shangyuan Festival, Zhao Huan's itinerary today would be to follow Zhu Lian to the Lantern Festival and guess the word puzzle.

Zhao Huan thought for a while and said: "You tell Zhu Guifei that the Bianjing Lantern Festival will take three to five days, and it's not too late to go tomorrow. ”

"This ......" Zhao Ying hesitated, but looking at the high-spirited official family, it was not easy to sweep the official family's Yaxing.

Zhao Huan looked at Zhao Ying's embarrassed appearance, and knew that it was estimated that Zhu Lian had carefully prepared for this lantern festival trip, Zhao Huan asked with a smile: "Why don't you ask Zhu Guifei if you want to go to see the big moon?" ”

"I'll go." Zhao Ying left with a smile on his face, and when he was ready to drive, Zhao Huan finally saw Zhu Lian, who was dressed carefully.

Zhao Huan was in the car to teach Liu Yi about the calculation process, in fact, it is not complicated, Liu Yi is a master of mathematics, and he speaks very clearly and thoroughly.

Liu Yi looked at Zhao Huan, who couldn't stop nodding, and was a little suspicious, did the official family really understand?

But he doesn't want to ask.

"The Ordnance Academy has arrived, official." Zhao Ying stopped the car and said to Zhao Huan in the car.

Zhao Huan stepped out of the car, and the area of the armory in front of him was getting bigger and bigger, and Zhao Huan could see the growth of the armory in the past year.

The invention of new equipment is not a simple process, and it is easy to appear that kind of oversized bed crossbow, but there is not much actual combat significance of the weapon.

After the Jin people were wounded and died in the battle, there were no generals to lead the charge.

As a result, there was an oversized bed crossbow in Shanhaiguan, and no arrow was fired.

However, Zhao Huan was not in a hurry, and now the weapons of the Great Song Dynasty were enough to lead.

Zhao Huan walked to an attic, which was built on the top of this mountain, and the top of the mountain was modeled after the top of the water transport instrument elephant platform, which could be closed or closed.

The afterglow of the setting sun shone on the houses in front of the observatory, the red bricks and green tiles shone in the setting sun, and in the few rooms in front of the attic, there were several busy officials of the Qin Heavenly Prison.

Responsible for the maintenance and data collection of astronomical instruments such as armillary spheres, fuchen spheres, armillary spheres, and chronometers.

【Bianjing Royal Observatory】

Zhao Huan actually wanted to remove the word royal, but the equipment here was out of the house, and the word royal was engraved on it.

It's just that when he arrived here, Zhao Huan actually heard the time signal of the water transport instrument again, and asked, "Zhao Ying, is this the moment?" Is there a ceremonial observatory here? ”

Zhao Ying nodded and said, "That's nature." The ceremonial towers of all state capitals across the country need to be adjusted here to give time to the state capitals. ”

Zhao Huan nodded, looking at the various equipment in the observatory, full of curiosity, the moon has not risen yet, and there is no way to observe it now.

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