Otaku Engineer in Great Tang Dynasty

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The three days that Li Chunfeng mentioned at the beginning have quickly passed!

In the past three days, Li Zexuan's theory of the solar system has been spreading rapidly in all directions from Chang'an at a speed like a hurricane, and more and more people know about it. What is it, how many planets are in the solar system, and what is the cause of a tengu eclipse?

On this day, it seemed as usual, the sun still rose from the east in the early morning, emitting a golden light, the people had already gone to work in the fields when the sun rose, the merchants had already entered the city at this time, the officials They are either in court or on duty in the government office, everything seems so normal!

"Xianggong, it is said that this day the dog eats the sun means the world will be in chaos. Is that really true?"

Yunshan Courtyard, the Li family, who knew that there would be a Tiangu eating sun today, didn't go anywhere today. Han Yuxi snuggled up on Li Zexuan's body in the backyard and asked softly.

Li Zexuan shook his head and said, "Of course not! Didn't my husband say it before? This day, the dog eating the sun is just an astronomical phenomenon caused by the movement of the stars. It has nothing to do with the chaos in the world, whether the prince is faint or not!"

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

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

Before, in fact, in the article "Overview of Astronomy", Li Zexuan not only introduced the cause of the solar eclipse, but also reminded the people that when the solar eclipse is coming, don't stare directly at the sun for a long time, otherwise it will be easily stabbed Eye! Although he mentioned this point, not many people seem to have noticed it, because people are only shocked by his theory of the solar system. Who cares if looking at the sun with the naked eye will hurt the eyes?

Besides, no one among the common people would have imagined that in just two days, there would actually be a world-class spectacle like the Tengu eating the sun on this piece of land in the Tang Dynasty!

But have the people 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 of 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 guy who was obsessed with astronomical research.

Hearing this, he quickly stood up and said, "Is there such a thing? I'll go check it out!"

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

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"Daoist Li, the mountain chief explained that no one can enter today, and Mo can't open the door for you!"

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

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

Li Chunfeng said relentlessly.

"Cough cough! Mo Zhong, go get busy first!"

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

"Here!"

Seeing Li Zexuan coming in person, Mo Zhong couldn't help but breathe a sigh of relief, then clasped his fists in response, and then slowly backed off!

"Master Hou..."

Seeing Li Zexuan, a hint of embarrassment appeared on Li Chunfeng's face.

Li Zexuan frowned and asked, "What is the important matter of Daochang Li, why do you have to use the astronomical telescope today? Ben Hou has said before that when the Tiangu eats the sun, it hurts the eyes the most. If Daochang uses a telescope to observe the sun , nine times 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, no matter whether it is with the naked eye or a telescope, it is impossible to directly observe the sun. It is hard to encounter a Tiangu eclipse day. At that time, the brightness of the sun's light should be much weaker. , If you don't take this opportunity to see it with your own eyes, Pindao is really unwilling! I also hope that Lord Hou will be successful! Pindao will end the observation before the sun reappears in a while, so there should be no serious problem, even if there is an accident, Pindao is also willing to bear the burden and have no regrets!"

Li Zexuan was speechless. He only considered safety issues, but not human nature. He didn't consider the fatal attraction of astronomical spectacles such as solar eclipses to astronomy enthusiasts like Li Chunfeng!

Even in modern times, once there is a solar eclipse anywhere, astronomy enthusiasts from all over the world will flock to them, set up professional equipment there in advance, and wait to observe the solar 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. Due to symmetry, the shadow of the moon, that is, the shadow falling on the surface of the earth, is just as wide. Can block the entire sun. The solar sphere is completely obscured by the moon, and the originally bright solar disk is obscured by the dark shadow of the moon. 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 people safely see the sun with the naked eye. During a total eclipse, almost all of the sun's light is blocked, and only the corona is visible, and the corona is only as bright as a full moon, so we can accept the light at this time.

but light

A tiny part of the sphere's light is enough to damage our eyes, so it's good 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, Ben Hou will not persuade you any more, but this telescope lens, Ben Hou must add some color!"

Having said this, he ignored Li Chunfeng, who was full of joy and doubts, and turned to Pang Feiji and instructed: "Feiji, go get me some ink, a glass of water and a writing brush!"

"Yes! Lord Hou!"

Pang Feiji took the order and left.

After a while, Pang Feiji brought all the ink, water, and writing brush that Li Zexuan wanted. Under the suspicious eyes of the two, Li Zexuan first diluted the ink slightly with water, then dipped the diluted ink with a writing brush, and then Holding a writing brush, he scribbled on the outer surfaces of the telescope's eyepiece and objective!

"Hey! Marquis! You don't want to let the poor man use this telescope. Why use ink to destroy it? How can this telescope be able to see things clearly?"

Li Chunfeng was heartbroken and stepped forward to stop him.

Li Zexuan didn't stop moving, and while smearing, he said: "Who said that you can't see clearly after doing this? This ink is diluted and won't block too much sunlight. It is just right for Daochang Li to observe the eclipse of the dog. This way As a result, it can also reduce the damage of sunlight to the eyes!"

Strictly speaking, when observing a solar eclipse, it is necessary to use professional polarized lenses, similar to sunglasses, to reduce the damage of sunlight to the eyes, but Li Zexuan could not create such lenses for a while, so he thought of one. A relatively simple method is to smear 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 to observe solar eclipses. In addition, exposed film, discarded floppy disks, protective glasses for welding, blackened glass, etc. can be used to replace those professional polarized lenses!

When Li Chunfeng heard this, he felt a little relieved.

After a quarter of an hour, Li Zexuan painted the two lenses of the telescope with diluted ink, and said to Li Chunfeng: "Okay! Daochang Li can do it at his own pace! But although this is covered with ink, I still ask Daochang Li. Don't stare at the sun for a long time!"

"The poor road saves you! Thank you Hou Ye!"

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 at it. He immediately felt that the whole world seemed to be smeared with a layer of light ink, and the light was not as dazzling as before, and the lens The clarity of the image does not seem to be affected much!

Seeing this scene, Li Chunfeng couldn't help being even more grateful to Li Zexuan!

……………………

Around noon, the farmers who were farming in the fields packed up their farm tools and prepared to go home for dinner. The pedestrians and traders on the street should also go home, and those who should go to the restaurant should 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, and the sun that was still shining brightly just a moment ago seemed to be partially blocked by something at this moment. As time passed, The area where the sun was blocked became larger and larger, and after a while, the sun was completely blocked, and the whole world suddenly became like night!

panic!

In the face of this sudden dark night, the first reaction of the people is to panic. After all, it was noon and broad daylight just a moment ago. Now the sky has become completely dark. How can you not panic when you encounter such a strange thing?

The screams of fear can be heard everywhere in the city and outside the city. People outside the house hurriedly want to go back home, but it is so dark that they can't even see their fingers, so how can they see clearly? The way home?

"The ghost is here! It must be that all the evil ghosts in hell have come out!"

"It's not the devil, it's the tengu eating the sun! The tengu are going to eat the sun, everyone quickly grab the guy, take out the gong, and if there is no gong, take an iron basin, and let's scare the tengu away!"

"What tengu eclipse the sun? This is called a solar eclipse! According to the Marquis of Yongan, the moon happened to be in the middle of the earth and the sun, so the genius suddenly turned black! There are no tengu, and there are no evil spirits!"

"When will it be bright today?"

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

The dark night came and people were panicking, but after the initial panic, people remembered the fiery solar system theory that had been circulating in the past few days, thinking that even the imperial court had acknowledged the correctness of this theory, the people settled down one after another, although the streets and alleys can still be seen. The faint sound of gongs and drums could be heard faintly, but it was nowhere near as noisy as when the whole people were beating gongs and drums in the days of Tengu!

It can be seen that the "Overview of Astronomy" published by Li Zexuan in "Datang Daily" a few days ago still played a considerable role!

…………………………

Yanhuang Academy, when the solar eclipse suddenly came, the students were still listening in the classroom before school was over. It was suddenly dark, and the students were a little panic at first, but under the comfort of the academy gentlemen, they quickly settled down After coming down, many daring students also walked outside the classroom, wanting to find out, and when they saw it, they were immediately struck by the wonders in the sky!

"Wow! What a beautiful light band! That's the moon, right? The moon seems to be wearing a necklace, it's really beautiful!"

I don't know who exclaimed, and it was immediately provoked.

The students inside ran out of the classroom and looked up.

During a total solar eclipse, the sun will gradually be blocked, and the sky will not only darken, but also appear strange colors. The temperature will drop a few degrees, the wind will pick up, and the birds think the sun is down and prepare to perch.

When the total solar eclipse begins, the light of the sun's photosphere continues to circle around the edge of the moon until it surrounds the moon. At this time, the moon looks like it is wearing a necklace. The bright spots on the edge are called Berry beads, which are extremely beautiful!

"Go into the classroom! The head of the mountain said that you can't look at the sun directly with your eyes for a long time, or you will hurt your eyes! All students, return to the classroom immediately!"

Although the gentlemen of Yanhuang Academy had no choice but to sigh at the magnificent scenery in the sky, they deeply remembered Li Zexuan's explanation at the beginning, so the gentlemen walked out of the classroom one after another and rushed the students outside into the classroom!

In the open-air atrium on the fourth floor of 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. !

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

Suddenly, Li Chunfeng was surprised, and his face became solemn.

…………………………

At the same time, in the east of Shuofang City, hundreds of miles away, a Turkic cavalry was heading towards Shuofang City.

This cavalry has about 20,000 people. Although the sergeants on horseback do not wear heavy armor like the Xuanjia Army, the momentum exuded by the 20,000 cavalry is not weaker than the Xuanjia Army!

This is an elite cavalry, this is the world-famous Turkic wolf cavalry!

"The speed is even faster! We must rush to Shuofang City before Tang Jun breaks the city!"

One of the Turkic generals at the head turned back and shouted loudly at this time.

"Yes!"

The cavalry behind him responded loudly, and then, the entire team rushed towards Shuofang City at a faster speed, rolling up smoke and dust all the way!

However, this aggressive Turkic wolf rider must not know that someone is waiting for him outside Shuofang City!

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