Tai Chi Hall.

The Palace Room of the Ministry of Rites.

Bursts of laughter could be heard from time to time in a dark room where the sun and moon had not been seen all year round, which looked eerie and strange.

Such a scene should obviously not exist in the solemn Liubu palace, but other people in the Ministry of Rites seemed not to be surprised.

At this time, an internal official from the palace came to the Ministry of Rites and knew directly that Zheng Xianzhi, the Minister of Rites, explained his purpose to him.

"Your Majesty wants to see He Chengtian?"

Zheng Xianzhi also had a headache, and finally pulled the internal official to a dark room.

"It's not that I'm disobeying the imperial edict, it's just that He Chengtian is old and has a weird temper. He has been calculating something these past few days. If anyone disturbs him, he will really hit them."

The eunuch frowned and gently opened the door in disbelief.

A somewhat rotten smell came from the shop, and the small dark room was filled with rice paper, with some Tianzhu numbers and symbols densely written on it, while a figure was lying on the ground, hunched over, writing and drawing on the ground.

"Shilang He, Your Majesty has a decree to summon you to the palace immediately."

The internal officer shouted, but found that He Chengtian didn't make any movement, so he yelled again at the top of his lungs, and then He Chengtian turned his head.

He Chengtian also comes from a noble family and has a decent appearance.

It's just that his current unkempt appearance makes it difficult for people to associate him with his status as a high-ranking member of the imperial court's etiquette department.

"Your Majesty summoned me?"

He Chengtian was stunned for a moment, and then he became happy alone: ​​"What a coincidence! I happen to be going to see Your Majesty too!"

Then, He Chengtian washed himself casually and followed the imperial officer happily to the Liangyi Hall.

"Your Majesty, He Chengtian, comes to see you! Your Majesty pays you a holy greeting!"

"I am safe."

He Chengtian was ordered to revise the new calendar as early as Liu Yu's period, and he also asked Gao Yun to leave. He was no stranger to Liu Yizhen.

But before Liu Yizhen opened his mouth, He Chengtian took the lead and excitedly reported to Liu Yizhen: "Your Majesty, I have recently made new achievements in studying the degrees of Zhou Tian!"

Weekly degrees.

Later generations also called it pi.

Liu Yizhen then remembered that He Chengtian was indeed a fierce man. He calculated the pi value to 3.1429.

From the perspective of future generations, this number may be a little biased, but in this era, He Chengtian is truly the number one person.

What's more, he can be considered as paving the way for the future Zu Chongzhi.

Any science must form a system.

As for the system, it must be completed by one generation for another. The kind of person who can complete the construction of the entire system of the subject by one person, at least Liu Yi has never seen it.

Sure enough, this was what He Chengtian reported to Liu Yizhen. Liu Yizhen also became interested, pulled Gao Yun, and sat around with He Chengtian to study mathematics.

Wang Xiu, Wang Maide: "..."

The three of them said they were discussing, but in fact, Liu Yizhen was standing in another dimension and crushing the other two.

Fortunately, Gao Yun has always known Liu Yizhen's true strength, and He Chengtian also supported Gao Yun's words about Liu Yizhen's true strength. His doubts about what Liu Yizhen said at the beginning gradually turned into shock, and then he learned with an open mind, until Liu Yizhen started

After unintentionally taking out the calculus, the two people's eyes turned into "confused".

Seeing that Liu Yizhen's voice was getting louder and louder, and the other two's voices were getting quieter and quieter, Wang Xiu hurriedly pulled Liu Yizhen out of the "immersive" teaching.

"Your Majesty! Sailing! Sailing!"

Liu Yizhen just woke up from a dream, and He Chengtian and Gao Yun also came out of the state of brain shutdown.

Among them, He Chengtian's eyes were lifeless. After a long time, a sentence came out of his mouth: "Your Majesty... is he inhuman?"

As soon as he said this, several pairs of eyes stared at him, especially Fan Daoji, who had been on guard, and almost rushed over and hacked He Chengtian to death.

He Chengtian woke up and quickly explained: "What I mean is... Your Majesty is not a human being, he is like a god!"

Everyone's eyes softened at this moment, but only Gao Yun and He Chengtian knew that this was not a flattery at all.

Others, they don’t understand mathematics.

Only by standing at the pinnacle of mathematics in this era like He Chengtian and Gao Yun can they experience the helplessness and fear facing Liu Yizhen.

The things in Liu Yizhen's mind are indeed far away from this era. Perhaps this is the reason why Liu Yizhen does not release all the knowledge he knows.

Different from the fear of the two of them, Liu Yizhen was very happy.

After all, it is difficult for me to talk and discuss with the world happily, and the consequences of that will be very terrible.

Only an extraordinary genius like He Chengtian can reluctantly talk to himself. So if you don't "persecute" him, who will Liu Yizhen "persecute"?

"I'm looking for Mr. He mainly because of the shipping matter."

After a quick vomit, Liu Yizhen got to the point.

"I know that Mr. He is proficient in astronomy and geography, so I would like to ask Mr. He to talk about the things needed for shipping."

Shipping?

He Chengtian himself is from Tancheng, Donghai County, and his understanding of shipping is far better than anyone else here except Liu Yizhen.

"Offshore shipping is actually not difficult. The route pointed out by His Majesty is actually to transport supplies from the south to the north along the land route around Qingzhou."

"In this way, you don't have to worry too much about things like supplies and fresh water."

"Only a little."

He Chengtian was a little worried.

"The sea is the sea after all, and the waves are unpredictable. Once there is a strong wind, the water will carry the ship and it will go nowhere."

"So, the direction of shipping is the top priority!"

After hearing the answer he wanted to hear, Liu Yizhen also expressed his request:

"Indeed, I asked Mr. He to come here just to solve this problem."

"I also hope that Mr. He can make a star map to solve the urgent need of shipping."

"This is easy!"

He Chengtian responded enthusiastically. He had studied astronomy all his life and could draw star pictures with his eyes closed, but the problem was still not solved.

"Even if you have a star map, it's still not foolproof."

The weather can't always be sunny, not to mention that the star chart needs to be paired with another artifact.

"This is not something that Sir He is worried about. As long as the star map is drawn, I can naturally solve the other problems."

When He Chengtian saw that the emperor was trying to hide his secrets, he didn't want to break the casserole and get to the bottom of the matter, so he followed Jin Yiwei out of seclusion and went to the East China Sea to draw a star map.

A few months later.

He Chengtian, who had drawn half of the star map, received the object given to him by Liu Yizhen.

"This one is called a compass. It can always point to the north. It complements the star chart perfectly."

"Another thing is called a telescope, which can help large ships at sea observe the surrounding situation."

Taken individually, these two things are powerful weapons for the country. Taken together, it can be said that they directly kicked open the door of China Shipping.

"This shipping is done!"

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I have an exam the day after tomorrow, take a day off tomorrow to adjust~
Chapter completed!