In Wenhua Hall, the emperor and ministers stared at the sight of the dog, and Zhao Hao used the model of the solar system to demonstrate the causes of solar eclipse, lunar eclipse and moon phases.

But to be honest, except that the moon phase is there because of the profit and loss of the moon, there is no need to prove it. The causes of solar eclipses and lunar eclipses are so simple that everyone still cannot believe.

It clearly demonstrates why solar eclipses only occur on the first day of the lunar month, and lunar eclipses only occur on the fifteenth day of the lunar month.

However, this evidence is far from convincing the public.

So everyone's eyes looked at Bei Peijia, the Imperial Heaven Supervisor, hoping that this old Yin-Yang man with a background in his family would help everyone solve their doubts.

Beipejia had no choice but to start, but he heard for the first time that the earth was revolving around the sun.

I heard Zhao Hao say, "At this point, you will definitely say, what is the difference between this and Xunzi's 'Theory of Heaven'? It's just a hypothesis."

The officials nodded with laughter, no.

As Zhao Hao said, in their opinion, the so-called "solar system" is just an idea. There is no essential difference between "Huntian Theory", "Gaitian Theory", and "Xuanye Theory", and they are all hypotheses.

As for hypothesis, believe it if you believe it, and fall down if you don’t believe it. So they don’t care too much, they just want to experience a novel experience.

"However, what I want to tell you is that this model is not imagined, but is calculated accurately from detailed observation data."

Then he heard Zhao Haoshi Potian say shockedly: "So, based on this, we can calculate the time and observation direction of each solar eclipse and lunar eclipse, even Venus conjunction with the moon, and the Moon, and the Heart of the Heart."

"Can you calculate it accurately?" Now, Ji Zheng Bei couldn't help but scream and said, "Brave!"

The censor who maintained order was about to scold him, but saw Master Xu shook his head slightly, and the censor obediently closed his mouth.

The day before yesterday, Mr. Xu called Superintendent Bei to the cabinet to give him a face-to-face speech, and today he was about to take the lead!

"Is this very strange?" Zhao Hao said arrogantly with a look of "What an idiot in the question":

"Astronomy has been called the study of heavenly calculation since ancient times. Didn't it rely on observation and calculation? Liu Hui's "Island Calculation" by the Western Jin Dynasty has written all the methods clearly. The ancestors of the Southern and Northern Dynasties can accurately calculate the orbits of the five major planets of wood, water, fire, gold and earth in the sky and the time required for one week, as well as the more accurate five-star rendezvous cycle. Even Guo Shoujing of the previous dynasty could calculate the yellow-red and red junction..."

"When it comes to Guo Shoujing, can't the "Shi Ji Calendar" of the previous dynasty be used to predict solar eclipse? It's just that it lacks accuracy." As he said that, he glanced at Na Bei's supervisor strangely and said:

"It's hard to imagine that an Imperial Heaven Superintendent asked such a question."

Superintendent Bei's face immediately turned red and Zhao Hao said it was hit by the pain, because this was the fatal flaw of the Imperial Heaven Supervision of the Ming Dynasty.

He knew that the "Time Calendar" could predict solar eclipse, but he couldn't understand it...

Because the mathematics in the Ming Dynasty was out of reach!

As mentioned before, in the middle of the Yuan Dynasty, China's mathematics leading the world declined sharply.

In addition to the reasons why cultural regression and scholars ignore it, the popularity of abacus during this period also caused the ancient mathematical system based on calculation to fall apart. Four Yuan, Tian Yuan, and Dayan were found to be one, and the multiplication and opening the ground until the dynasty was completely lost.

Without these mathematical tools, the Imperial Heavenly Prison could not understand the "Shuoshi Calendar" derived from the Tianyuan Technique, and the solar eclipse they calculated based on the current "Datong Calendar" was full of flaws and had no reference value at all.

So much so that the Imperial Heaven Survey is generally considered to be a simple observation of astronomical phenomena.

In the eyes of all officials, their daily work is to look up at the sky, record abnormal celestial phenomena, then check and compare divination books, copy books and submit them to the court. There is no need to be very high at all, just knowing literacy and can do it.

Jing Zheng Bei was very angry about this, at least he compiled the imperial calendar every year, and it was still very technical!

So, Yibei Jian's face was red for a while, and Fang gritted his teeth at Zhao Hao and said, "Yes, I can't calculate it, but I believe that no one in the entire Ming Dynasty can calculate it!"

"I can." Zhao Hao smiled faintly and said, "And my disciples can do it too."

"Then you can just let it go!" Chief Bei laughed and said, "If I can really figure it out, what if I take you as my teacher on the spot?"

"You are taking advantage of me." Zhao Hao made a statement. "It's not that easy to become a teacher."

Mr. Li and Mr. Chen agree deeply. Their young masters are still solving geometry problems at home...

"Zhao Hao, what do you think is this place?!" The little master finally couldn't help it and shouted: "Stop being presumptuous here!"

"You are the one who is presumptuous, Master Xiao?" Zhao Hao sneered and glanced at him, "Don't you know that it's impolite to interrupt others?"

"you!"

"Silent!" Seeing that the censor was stolen, Teng Xiang had to be born and scolded: "Don't quarrel, talk well."

Zhao Hao then turned to Jingzheng Bei and said, "For the sake of Your Majesty, I will make an exception and accept you as a registered disciple."

"You calculate it first!" Superintendent Bei was so amused and crying, thinking that I was a fifth-rank official, but I was actually disliked by a small attendant.

There are so many mad people at the Attendant, it is true.

"Well, given your limited math level, I will teach you a simple algorithm." Zhao Hao cleared his throat and said loudly:

"It has been demonstrated just now that solar eclipses and lunar eclipses are caused by the movement of the sun, earth and moon to a special position. The movement cycle and orbit of the earth around the sun and the moon around the earth are regular, so the occurrence of solar eclipses and lunar eclipses must also be regular."

"Astronomers in the Han Dynasty called the orbit of the earth the ecliptic and the orbit of the moon the ecliptic. And it has been discovered that the two are not on the same plane, but have a yellow-white intersection angle of five degrees and nine minutes." Then Zhao Hao pointed to the model, the orbits of the earth and the moon:

"Now, let's look at the conditions for solar eclipse to occur. It can only occur on the new day, and the sun and the moon must be almost on a straight line."

While speaking, Yu Shenxing set the relative positions of the sun and the moon on the model during the solar eclipse.

"You can see that when a solar eclipse occurs, the sun and the moon must be located near the intersection of yellow and white." Zhao Hao said, and Yu Shenxing pushed three small balls to rotate along the track:

"Suppose many days later, the sun and the moon move to almost the same position as this, then a similar solar eclipse will be observed on the earth."

The astronomy of the Ming Dynasty was indeed a mess. This was very common knowledge in the Han Dynasty. Only Jingzheng Bei and his deputy could keep up. The eyes of the others were already distracted, just like seeing you here...

Seeing that Ji Jian Bei nodded, he obviously understood, Zhao Hao continued with a little relief:

"So as long as the sun passes through the yellow and white intersection point continuously, and the moon passes through the yellow and white intersection point twice in a row, then find the minimum common multiple of these two numbers and the number of days per month, it is the number of days required to repeat it once!"

"On average, 29:53 days a month, 27:21, 20:21, and 346:62 days a month."

The data on the lunar and eclipse year of the intersection have existed since ancient times, and the supervisor of Bei can tell it casually.

Obviously, the uncle is not a good person.

"Then will you calculate?" Zhao Hao asked Qiji.

Superintendent Bei shook his head, tears were almost falling.

"Okay, I'll teach you." Mr. Zhao was a good teacher after all, so he taught him step by step how to decompose the main factor.

Unexpectedly, the uncle knew it and immediately picked up the pen and calculated it. After a while, he reported the number and said, "It should be 6,585 and one third of the day."
Chapter completed!