Otaku Engineer in Great Tang Dynasty

The three days that Li Chunfeng said at the beginning soon passed!

In the past three days, Li Zexuan’s solar system theory has been spreading rapidly in all directions from Chang’an at the speed of hurricanes and rains. More and more people know about it. The people in a radius of hundreds of miles now almost all know the "solar system". What is it, how many planets are there in the solar system, and what is the cause of the Tengu eclipse? These are questions!

On this day, it seemed as usual. The sun was still rising from the east in the early morning, giving off a golden light. When the sun rose, the people had already gone down to work. The vendors had already entered the city at this time, officials. They are either in the upper court or on duty in the government office, everything seems so normal!

"Msang Gong, they all say that the eclipse of the dog means the world will be chaotic, is that really the case?"

Yunshan Courtyard, the Li family who knew there would be a Tengu Eclipse Day a long time ago, did not go anywhere today, Han Yuxi nestled on Li Zexuan in the backyard and asked softly.

Li Zexuan shook his head and said, "Of course not! Didn't you say that before? The eclipse of the sky is just an astronomical phenomenon caused by the movement of stars. It has nothing to do with the chaos of the world and the faintness of the county king!"

Han Yuxi frowned and said, "But these legends have been around since ancient times, and it is difficult for a concubine to turn around for a while!"

Li Zexuan smiled and was about to speak, when Pang Feiji suddenly walked in from outside and said, "Master Hou, it's not good! Daochang Li insisted on going to the courtyard of the Guanghua Building of the academy, and wanted to use the astronomical telescope to observe the Tiangu eclipse day for a while. No one can stop it!"

In fact, Li Zexuan not only introduced the cause of the solar eclipse in the "Overview of Astronomy" article before, but also reminded the people that when a solar eclipse is coming, do not stare directly at the sun for a long time, otherwise it is easy to sting eye! Although he has mentioned this point, not many people seem to have noticed it, because people are only shocked by his solar system theory. Who cares whether seeing the sun with the naked eye hurts the eyes?

Besides, no one among the folks would have thought that after just two short days, this land of Datang would actually have such a world-famous spectacle as the Tengu Eat Sun!

But has the public noticed that Li Zexuan can't control it, but he can do what he should do, which is to close the atrium of Guanghua Building in Yanhuang Academy and prohibit students and teachers from using astronomical telescopes during the solar eclipse!

He did not expect to ban the students and teachers of the academy, but he did not ban Li Chunfeng, a fellow who is obsessed with astronomy research.

Hearing this, he quickly stood up and said: "There is such a thing? I'll go and see!"

After that, he greeted Han Yuxi and took Pang Feiji out.

.........................

"Dao Chief Li, Chief Shan confessed that no one can enter today, and Mo can't open the door for you!"

When Li Zexuan came near the atrium on the fourth floor of Guanghua Building, he heard Mo Zhong's helpless voice.

"Commander Mo, please make it easy. Pang Dao must use this astronomical telescope today, because Pang Dao has very important things, and Pang Dao is willing to bear all the consequences!"

Li Chunfeng said persistently.

"Ahem! Mo Zhong, go ahead!"

Seeing this, Li Zexuan coughed lightly, walked out and said.

"Here!"

Mo Zhong saw that Li Zexuan had come in person, he couldn't help but heaved a sigh of relief, then clasped his fists in response, and then slowly backed away!

"Master Hou..."

Seeing Li Zexuan, Li Chunfeng's face suddenly appeared embarrassed.

Li Zexuan frowned and asked, "What is the important thing about Daochang Li, who must use an astronomical telescope today? Benhou has already said that when the Tengu eclipses the sun, it hurts the eyes most. If Daochang uses a telescope to observe the sun , Nine out of ten, you will be blinded by the sun, why do you insist on doing this?"

Li Chunfeng said with a serious face: "Master Hou, the sun is bright on weekdays. It is impossible to observe the sun directly with the naked eye or a telescope. It is not easy to encounter a Tengu eclipse day. At that time, the brightness of the sun should be much weaker. If you don’t seize this opportunity to see with your own eyes, Pang Dao is really unwilling! I also hope that Lord Hou will be fulfilled! Pang Dao will end the observation before the sun appears. There should be no serious problem, even if there is an accident, Pang Dao will I am willing to bear it without any regrets!"

Li Zexuan was silent. He only considered safety issues but not human nature. He did not consider the astronomical spectacle of solar eclipse that is fatal to astronomers like Li Chunfeng!

Even in modern times, whenever a solar eclipse is encountered anywhere, astronomers from all countries and regions around the world will travel far and wide, flock to them, set up professional equipment there in advance, and wait for the observation of the eclipse!

However, today’s solar eclipse, according to Li Chunfeng’s prediction, should be a total solar eclipse. The sun is 400 times wider than the moon, but it is also 400 times farther away from the earth. Because of symmetry, the moon's shadow, that is, the shadow that falls on the surface of the earth, is just wide enough to cover the entire sun. The sun's photosphere is completely obscured by the moon, and the originally bright sun disk is obscured by the black moon shadow. At this time, a total solar eclipse will occur!

In addition to total solar eclipses, there are partial solar eclipses, annular solar eclipses, total annular eclipses, etc. However, in comparison, only during a total solar eclipse can we see the sun with our naked eyes relatively safely. During the total eclipse, almost all of the sun's light is blocked, only the corona is visible, and the corona's light is only equivalent to the full moon, so we can accept the light at this time.

However, the light from the small part of the photosphere is enough to harm our eyes, so it is better to have safety measures during a total solar eclipse.

Thinking of this, Li Zexuan said to Li Chunfeng: "Since Daochang Li insists on doing this, I won't persuade you again, but I have to add some color to the lens of this telescope!"

Having said that, he disregarded Li Chunfeng, who was full of joy and doubt, turned around and said to Pang Feiji: "Feiji, you can help me with the ink, and get a glass of water and a brush!"

"Yes! Lord Hou!"

Pang Feiji led the way.

After a while, Pang Feiji brought all the ink, water, and brush that Li Zexuan wanted. Under the dubious gaze of the two, Li Zexuan first slightly diluted the ink with water, and then dipped the brush with the diluted ink. Holding the brush, he smeared the outer surface of the eyepiece and objective lens of the telescope!

"Hey! Lord Hou! You don't want to let Xiang Dao use this telescope. Why use ink to destroy it? In this way, how can the telescope see clearly?"

Li Chunfeng was heartbroken and stepped forward to stop him.

Li Zexuan kept moving in his hands, smearing, and said: "Who said that you can't see it clearly? This ink is diluted and won't block too much sunlight. It is suitable for Daochang Li to observe the eclipse day of Tengu. As a result, the damage to the eyes from the sun can be reduced!"

Strictly speaking, when observing the solar eclipse, you need to use professional polarized lenses, similar to sunglasses, to reduce the damage of sunlight to your eyes, but this kind of lens Li Zexuan can't make it for a while, so I thought about it. The simpler method is to paint the lens of the telescope with diluted ink. Although this method is simple, it is indeed effective.

In modern times, many people have used this method. In addition, you can also use exposed film, used floppy disks, welding protective glasses, blackened glass, etc., to replace those professional polarized lenses. !

Li Chunfeng felt relieved after hearing this.

Half a quarter of an hour later, after Li Zexuan painted all the two lenses of the telescope with diluted ink, he said to Li Chunfeng: "Okay! Now Daochang Li can do it yourself! But even though it is coated with ink, Daochang Li is invited. Don't look directly at the sun for a long time!"

"You can save it! Thank you Lord Hou!"

Li Chunfeng bowed his hands and thanked him.

Li Zexuan nodded, then turned around and left!

After he left, Li Chunfeng immediately put his eyes in front of the eyepiece of the telescope and glanced roughly. He immediately felt that the whole world was smeared with a faint layer of ink, and the light was not as dazzling as before, but this lens The sharpness of imaging does not seem to be affected much!

Based on this, Li Chunfeng couldn't help being more grateful to Li Zexuan!

.........

Around noon, the farmers in the field packed their farm tools and prepared to go home to eat. The pedestrians and vendors on the street should also go home. Those who should go to the restaurant go to the restaurant. Everything looks the same as before. , But at this moment, the sky that was clear and cloudless suddenly dimmed at this moment. The sun that was still glowing at the moment before seemed to be partially blocked by something. As time goes on, The area where the sun was blocked was coming more and more. After a while, the sun was completely blocked, and the whole world suddenly became like night!

panic!

In the face of this sudden night, the people’s first reaction was panic. After all, it was noon or broad daylight the moment before. Now the sky has become completely dark. Many people have never experienced such strange things in their lives. How can you not panic!

Inside and outside the city, the people’s screams of fear can be heard everywhere. The people outside the house hurriedly want to go home, but now it’s so dark that they can’t even see their fingers, so how can they see clearly? Where's the way home?

"The ghost is coming! It must be the evil spirits of **** coming out!"

"It's not an evil spirit, it's a Tengu eclipse day! Tengu is going to eat the sun, everyone quickly copy the guys, take out the gong, take out an iron basin if there is no gong, and let's scare away the tengu!"

"What Tengu eclipse day? This is called a solar eclipse! According to Yonganhou, the moon happened to be blocking the middle of the earth and the sun, so the sky suddenly turned black! There are no tengu and no evil spirits!"

"Then when will it be bright this day?"

"Soon, in less than a quarter of an hour, the sky will return to normal!"

When the night fell, people were in panic, but after experiencing the initial panic, people thought of the hot solar system theory that had been circulating in the past few days, thinking that even the court had recognized the correctness of this theory, and the people settled down, although the streets are still faint. The sparse sound of gongs and drums can be heard, but it is nowhere near the noise of the whole people beating gongs and drums in tengu days!

This shows that the "Overview of Astronomy" published by Li Zexuan in the "Datang Daily" a few days ago still played a certain role!

........................

Yanhuang Academy, when the solar eclipse suddenly fell, the students were still in the classrooms before school was over. The sky was suddenly dark, and the students panicked at first, but under the comfort of the gentlemen of the Academy, they quickly settled down. After coming down, many daring students walked outside the classroom, wanting to find out. This look was immediately beautiful by the wonders in the sky!

"Wow! What a beautiful strip of light! Isn't that the moon? The moon seems to be wearing a necklace, it's so pretty!"

I don't know who exclaimed, and suddenly the students in the classroom ran out of the classroom and looked up.

During a total solar eclipse, the sun will be gradually obscured. At this time, the sky will not only darken, but also strange colors will appear. The temperature will drop by a few degrees, there will be wind, and the birds think the sun is down and prepare to roost.

When the total solar eclipse begins, the light from the sun’s photosphere continues to circle the edge of the moon until it surrounds the moon. At this time, the moon looks like it is wearing a necklace. The bright spot on the edge is called a berry, which looks very beautiful. !

"All go into the classroom! Shan Chang said that you can't look at the sun directly with your eyes for a long time, otherwise you will hurt your eyes! All students, return to the classroom immediately!"

Although the gentlemen of Yanhuang Academy had to sigh the magnificence of the scenery in the sky, they still deeply remember Li Zexuan's original explanation, so the gentlemen walked out of the classroom and drove the students outside into the classroom!

In the open-air atrium on the fourth floor of the Guanghua Building, Li Chunfeng was fascinated by what he saw in front of the telescope. He completely forgot what Li Zexuan had told him before. At this moment, he wished to stick his eyeballs on the lens of the telescope. !

"Huh? This light doesn't seem right?"

Suddenly, Li Chunfeng gave a startled suspicion, and his expression became serious.

.........

At the same time, to the east of Shuofang city hundreds of miles away, a Turkic cavalry was marching towards Shuofang city.

This cavalry has more than 20,000 men. Although the horse sergeants are not wearing heavy armor like the Xuanjia Army, the momentum that the 20,000 cavalry exudes is not weaker than the Xuanjia Army!

This is an elite team, this is the famous Turkic wolf rider!

"The speed is faster! We must hurry to Shuofang City before Tang Jun breaks the city~www.readwn.com~!"

A Turkic general at the head, turned his head and shouted loudly.

"Yes!"

The cavalry behind him responded loudly, and then, the whole team ran towards Shuofang City at a faster speed, and collected smoke and dust all the way!

It's just that this aggressive leader of the Turkic wolf rider certainly didn't know that someone outside Shuofang was waiting for him!

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First!

Two chapters in one!

Thanks to Heihongmeifang for his two great rewards! (March 24)

(End of this chapter)