The most arrogant in history

Chapter 340: Eclipse of the Sun and Moon.

"Song Poliu!"

Ye Kun suddenly remembered and said with a smile: "You are the guy who drank secretly in the army and almost had his head chopped off. I remember you. I also promised you that I would drink with you after we won the battle. Later, after we won the battle, I was too busy and forgot about it, and you didn't come to find me!"

"King of Hanzhong, it turns out that you really do remember me."

Song Poliu was so excited that she knelt down.

Ye Kun helped Song Poliu up:

"I have already issued an order to cancel the kneeling ceremony in Yizhou. In my army, we are all brothers, there is no such thing as adults or children. I am your principal now, you can call me principal, or you can call me Brother Ye!"

"King of Hanzhong, you treat us like brothers. We...would never repay you with our lives."

Song Poliu wiped her tears and smiled, "I followed the King of Hanzhong and fought in the Battle of Hanzhong and the Battle of the Xiongnu, but... this is the first time I have spoken so much to the King of Hanzhong."

"There will be plenty of opportunities to talk in the future, haha."

Ye Kun waved at the students: "I will be in the military academy, eating and living with you for half a month, and training with you all!"

The students cheered: "We pledge our loyalty to the King of Hanzhong until death!"

Ye Kun nodded and smiled, very satisfied.

If the grassroots officers and soldiers are all loyal to him, his basic foundation will be stable in the future.

On the second day of school, Ye Kun changed into training clothes and led everyone to run, do exercises, organize formations, and tidy up their rooms.

Just like the students, I fell and tumbled.

For half a month, Ye Kun stayed in the military academy most of the time, teaching everyone knowledge such as capturing the enemy, fighting, surviving in the wild, reconnaissance and sneak attacks.

Ye Kun also has a skill, which is to dig a standard battlefield smokeless stove in the wild in five minutes!

The students were very impressed.

In half a month, Ye Kun became very familiar with this group of students.

The students' enthusiasm for learning was fully aroused, and everything was on the right track.

Ye Kun also ordered the military corps in various places to select outstanding young soldiers and send them to him for further training.

After settling the affairs of the military academy, Ye Kun took care of government affairs and turned to technical research.

Old He and his daughter, along with Pang Jia and Sun Yi, came to ask for a meeting.

Ye Kun asked about the recent technological developments.

Pang Jia was very proud and took out something:

"Brother, the task you assigned me has been completed. This is the compass. You can carry it with you and hide it in your arms. And we used standard parts, so we can mass-produce it. We have already made more than a hundred of them."

"Junior brother is indeed not simple!"

Ye Kun praised his two fellow apprentices and took the compass to look at it.

The compass is smaller than a small bowl and larger than an old pocket watch.

The accuracy is also good, and it has a glass cover.

In this era, such a portable compass is considered small.

It can be seen that Pang Jia and Sun Yi really put in a lot of effort.

"Good stuff, good stuff!" Ye Kun laughed and said:

"From now on, each of the senior generals in the army can have a compass. My two junior brothers have worked hard, so let the workers continue to make it. Also, think about whether it can be made smaller."

Pang Jia sighed: "If you want it to be smaller, it will be difficult. If it is too small, the magnetic force will not be enough, which will affect the accuracy."

"so be it."

Ye Kun nodded and asked, "Are there any progress in the research on clocks and watches?"

Sun Yi smiled and said, "We have developed the water-powered instrument. The daily error is now controlled within half a quarter of an hour. We can already tell time. But it is very large and cannot be taken away."

"That's amazing too!" Ye Kun was overjoyed: "How big is the water-transporting instrument? I'll take some time to go and see it!"

Sun Yi sighed, "It's more than ten feet high. One room can't hold it."

At that time, the ultimate goal of the task given by Ye Kun was a portable clock.

This thing, which cannot even fit in a whole room, is too far from the ultimate goal, so Pang Jia and Sun Yi both sighed.

In addition, the water-powered instrument is driven by water power and is even more difficult to carry.

"To be honest, Junior Brother, I thought it would take you two a lifetime to come up with the water-transporting instrument." Ye Kun chuckled.

"But you only took two years. You are definitely a genius, a prodigy. So, I will give you credit for this!"

Pang Jia and Sun Yi both breathed a sigh of relief.

He Tiantian smiled and said, "Master Ye, Sun Yi is still studying the telescope and microscope, helping to adjust them, and has made great progress. The observatory's telescopes have been replaced with three, and now they are clearer than before. When the weather is good, we can see the rings of Jupiter that you mentioned."

Ye Kun was even happier: "I've seen Junior Brother Sun, and he seems to be very interested in optical instruments. I can focus on this field in the future."

Sun Yi was humble instead: "It was Uncle He and Tian Tian who taught me some knowledge about optics, so I gradually got the hang of it."

Tian Tian smiled and said, "That's what Master Ye taught us."

Ye Kun had already told Lao He and his daughter about the basic knowledge of optics a few years ago.

The speed of light, refraction and reflection of light, angle of incidence and angle of reflection, principle of pinhole imaging, etc.

Ye Kun even talked about the wave-particle duality of light and the double-slit interference experiment!

"Whether it is a microscope or a telescope, or a solar cooker, optical theory is needed to support its manufacture. We will discuss this knowledge later."

Ye Kun praised Sun Yi and asked, "Jin Feng, who is in charge of astronomical research, has there been any progress?"

Lao He said: "Jin Feng is very capable. He calculated that there will be a solar eclipse three days later, on August 20, around lunch time. He is currently bringing a few assistants to further calculate, hoping to make the calculation more accurate."

"Is there going to be a solar eclipse the day after tomorrow? This guy, why didn't you tell me earlier!"

Ye Kun was a little surprised.

Solar and lunar eclipses were not auspicious signs in ancient times.

It is generally believed that the rulers are immoral and God is angry and is about to bring disaster!

Especially the solar eclipse, which makes people extremely frightened!

The sun suddenly disappeared, and the day turned into night. How could this be possible?

Lao He said, "Master Jin only figured it out two days ago, and was afraid that there might be errors in his calculations, so he..."

"Stop talking, just follow me to the observatory."

Ye Kun interrupted Lao He.

Together, they rode to the observatory outside the city.

Jin Feng looked haggard, with dark circles under his eyes. He was comparing the drawings with the star chart, still making calculations.

The assistants next to him also had bloodshot eyes.

Seeing Ye Kun, Jin Feng hurriedly greeted him: "Greetings to the King of Hanzhong."

"No need to be polite. Thank you for your hard work." Ye Kun waved his hand and went straight to the point: "Have you calculated the exact time of the solar eclipse?"

Jin Feng wiped his sweat off his forehead and said, "I can only estimate that it was around lunchtime on August 20th. I can't be more specific..."

"It's not your fault. The data I provided is not very accurate about the distance between the earth and the sun."

Ye Kun sighed and said, "Don't worry, let's review it together and start from the beginning."

Ye Kun remembers the distance between the earth and the moon and the distance between the earth and the sun in meters very clearly.

But the length unit of the Dading Kingdom is not meter, but zhang, chi, cun, bu...

What gave Ye Kun a headache was that he had no way of determining the exact one-meter distance!

After traveling through time, there is nothing to refer to.

Therefore, Ye Kun could only determine the distance of one meter based on his height, stride, and naked eye judgment, and then convert it into the length of the Da Ding Kingdom.

As the saying goes, a small mistake can lead to a big error.

If Ye Kun's estimate of the distance of one meter had a slight error, when applied to the calculation of the distance between the earth and the sun, that would be an error of thousands of miles!

I have also thought about using the known density of gold and silver to determine the distance of one meter.

For example, the weight of a regular three-dimensional gold block is controlled to be 19.32 tons, and the side length is the standard one meter.

But the weight units of Dading Kingdom are also different. Ye Kun cannot be sure how much one kilogram or one gram is!

Everything is just guesswork!

Jin Feng rubbed his eyes and continued to calculate the data and simulate the movement of the earth and the sun with Ye Kun.