The three days that Li Chunfeng had mentioned had passed very quickly!
In these three days, Li Zexuan's Solar System Theory spread like wildfire, with Chang 'an as the center. More and more people knew about it. Almost all the people within a few hundred miles knew what the Solar System was, how many planets were there in the Solar System, and what was the cause of the solar eclipse in the Heavenly Dog!
This day seemed to be the same as usual. The sun still rose from the east in the early morning, emitting a golden light. When the sun rose, the people had already gone to work in the fields. The merchants had also entered the city. The officials were either attending court or on duty in the government office. Everything seemed so normal!
"Husband, it is said that the solar eclipse means that the world will be in chaos. Is that true?"
In the courtyard of Yunshan, the Li family, who had known that the solar eclipse would happen, did not go anywhere today. Han Yuxi leaned on Li Zexuan in the backyard and asked softly.
Li Zexuan shook his head and said, "Of course not! Didn't I say it before? The solar eclipse is just an astronomical phenomenon caused by the movement of the stars. It has nothing to do with the world being in chaos or the Prince being muddle-headed! "
Han Yuxi frowned and said, "But these legends have been around since ancient times. It is hard for me to understand them in such a short time!"
Li Zexuan smiled and was about to speak when Pang Feiji suddenly walked in from outside and said, "Marquis, bad news! Priest Li insists on going to the courtyard of the Guanghua Building of the Academy. He wants to use the astronomical telescope to observe the solar eclipse. No one can stop him! "
Previously, Li Zexuan had not only introduced the cause of the solar eclipse in the article "Overview of Astronomy", but also reminded the people not to directly stare at the sun for a long time when the solar eclipse was coming. Otherwise, it would hurt their eyes! Although he had mentioned this, not many people seemed to have noticed it. Because people were shocked by his solar system theory, who cared if it would hurt their eyes if they looked at the sun with the naked eye?
Besides, no one would have thought that in just two short days, the Heavenly Dog eating the sun would really appear on the land of the Great Tang!
However, Li Zexuan did not care whether the public noticed it or not. He could do what he had to do, and that was to seal off the atrium of Yanhuang College's Guanghua Building and prohibit students and teachers from using telescopes during the solar eclipse!
He did not expect that even though he had banned the students and teachers of the Academy, he could not stop Li Chunfeng who was obsessed with astronomy.
Hearing this, he quickly stood up and said, "Is there such a thing? I'll go take a look! "
Then, he greeted Han Yuxi and left with Pang Feiji.
…
"Taoist Li, the Yamachō said that no one is allowed to enter today. I can't open the door for you!"
When Li Zexuan arrived at the courtyard on the fourth floor of Guang Hua Tower, he heard Mo Zhong's helpless voice.
"Commander Mo, please do me a favor. I have to use this telescope today because I have something very important to do. I'm willing to bear all the consequences!"
Li Chunfeng said stubbornly.
"Ahem! Mo Zhong, you can go now! "
Seeing this, Li Zexuan coughed softly and walked out.
"Yes!"
When Mo Zhong saw that Li Zexuan had come personally, he could not help but let out a sigh of relief. Then, he cupped his fists in acknowledgment and slowly walked away.
"Marquis …"
Seeing Li Zexuan, Li Chunfeng's face suddenly showed a trace of awkwardness.
Li Zexuan frowned and asked, "Taoist Li, what is so important that you have to use the telescope today? I've told you before that when the Heavenly Dog eats the sun, it will hurt your eyes the most. If you use the telescope to observe the sun, you will most likely be blinded by the sunlight. Why do you insist on doing this? "
Li Chunfeng said seriously, "Marquis, the sun is usually very bright. Whether it's with the naked eye or with the telescope, it's impossible to observe the sun directly. It's rare to see a Heavenly Dog eat the sun. When that time comes, the sun will be much dimmer. If I don't take this opportunity to observe it with my own eyes, I will not be satisfied! I hope that Marquis will allow me to do this! I will end my observation before the sun reappears. It should be fine. Even if there is an accident, I am willing to bear all the consequences without any regrets! "
Li Zexuan was speechless. He had only considered the issue of safety, but he had not considered the issue of humanity. He had not considered the fatal attraction of an astronomical spectacle like a solar eclipse to an amateur astronomer like Li Chunfeng!
Even in modern times, whenever there was a solar eclipse, astronomy enthusiasts from all over the world would swarm over from thousands of miles away, set up professional equipment there in advance, and wait to observe the solar eclipse!
However, according to Li Chunfeng's prediction, today's solar eclipse should be a total solar eclipse. The sun was 400 times wider than the moon, but it was also 400 times further away from the earth. Due to symmetry, the moon's shadow, which was the shadow that fell on the earth's surface, was just wide enough to cover the entire sun. The sun's light sphere was completely covered by the moon, and the originally bright sun's disk was covered by the moon's shadow. At this time, a total solar eclipse would occur!
Other than total solar eclipses, there were also partial solar eclipses, annular solar eclipses, annular solar eclipses, and so on. However, relatively speaking, only during a total solar eclipse could people safely look at the sun with their naked eyes. During a total solar eclipse, almost all of the sun's light was blocked. Only the sun's corona could be seen, and the corona's light was only equivalent to the full moon. Therefore, the light at this time was acceptable.
However, the light from a small part of the photosphere was enough to hurt our eyes. Therefore, it was better to have safety measures during a total solar eclipse.
Li Zexuan thought of this and said to Li Chunfeng, "Since Taoist Master Li insists, I won't persuade you anymore. However, I have to add some color to the lens of this telescope!"
He then turned to Pang Feiji and said, "Feiji, get me some ink, a cup of water, and a brush!" Li Chunfeng looked at Li Chunfeng, who was both happy and confused at the same time.
"Yes! Marquis! "
Pang Feiji took the order and left.
After a while, Pang Feiji brought over all the ink, water, and writing brush that Li Zexuan asked for. Under the two's confused gaze, Li Zexuan first diluted the ink with water, then dipped the writing brush in the diluted ink. After that, he held the writing brush and painted the surface of the eyepiece and the objective lens of the telescope!
"Hey! Marquis! It's fine if you don't want me to use this telescope, but why do you have to destroy it with ink? How can the binoculars be able to see clearly like this? "
Li Chunfeng was heartbroken and tried to stop him.
Li Zexuan did not stop. As he painted, he said, "Who said that I can't see clearly? This ink is diluted, so it won't block too much sunlight. It's just right for Taoist Master Li to observe the solar eclipse. This way, it can reduce the damage to your eyes! "
Strictly speaking, when observing a solar eclipse, it was necessary to use professional polarizing lenses, similar to sunglasses, to reduce the damage caused to the eyes by the sunlight. However, Li Zexuan couldn't make such lenses in a short time, so he thought of a simpler method, which was to use diluted ink to smear the lenses of the telescope. Although this method was simple, it was indeed effective.
In modern times, many people used this method to observe solar eclipses. Other than that, they could also use exposed film, old floppy disks, protective lenses for welding, blackened glass, and so on to replace the professional polarized lenses!
When Li Chunfeng heard this, he felt slightly relieved.
After a few minutes, Li Zexuan finished painting both lenses of the telescope with diluted ink. He then said to Li Chunfeng, "Alright! Taoist Master Li, you can do as you please! Although I've painted the lens with ink, please don't look directly at the sun for too long! "
"I know! Thank you so much, Marquis! "
Li Chunfeng said gratefully.
Li Zexuan nodded, then turned around and left!
After he left, Li Chunfeng immediately moved his eyes closer to the eyepiece of the binoculars. After a quick glance, he felt as if the whole world had been smeared with a thin layer of ink. The light was not as dazzling as before, and the clarity of the lens did not seem to be affected by the light!
Because of this, Li Chunfeng was even more grateful to Li Zexuan!
.....
Around noon, the farmers in the fields packed up their farming tools and prepared to go home for lunch. The pedestrians and peddlers on the streets also went home or went to the restaurants. Everything looked the same as before. But at this moment, the originally clear and cloudless sky suddenly darkened. The sun that was still shining brightly a moment ago seemed to be partially blocked by something. As time passed, the area where the sun was blocked became smaller and smaller. Before long, the sun was completely blocked, and the entire world suddenly became as dark as night!
Panic!
Faced with the sudden darkness, the citizens' first reaction was panic. After all, it was still noon a moment ago. Now, the sky had turned completely dark. Many people had never experienced such a strange thing in their entire lives. How could they not panic when encountering such a strange thing?
Inside and outside the city, the terrified screams of the commoners could be heard everywhere. The people outside hurriedly wanted to return home, but it was so dark that they couldn't even see their fingers clearly. How could they see the way home?
"The ghosts are here! All the evil spirits from hell must have come out! "
"It's not evil spirits, it's the Heavenly Dog eating the sun! The Heavenly Dog is going to eat the sun. Everyone, take out your weapons and take out your gongs. If you don't have a gong, take out an iron basin. Let's scare the Heavenly Dog away together! "
"What Heavenly Dog eating the sun? This is called a solar eclipse! According to Duke Yong 'an, the moon happened to be in between the earth and the sun. That's why the sky suddenly turned dark! There's no Heavenly Dog or evil spirit! "
"Then when will the sky turn bright?"
"Soon, in less than 15 minutes, the sky will return to normal!"
As the night fell, the people were in a state of panic. However, after the initial panic, the people began to think about the Solar System Theory that had been circulating for the past few days. Thinking that even the imperial court had acknowledged the validity of this theory, the people began to calm down. Although the faint sounds of gongs and drums could still be heard in the streets, it was far less noisy than during the days of the Heavenly Dog!
Thus, it was obvious that the article "Overview of Astronomy" that Li Zexuan published on Datang Daily a few days ago had some effect!
.....
At Yanhuang College, when the solar eclipse suddenly descended, the students were still in class. The sky suddenly turned dark, and the students were panicking at first. However, under the comfort of the teachers of the college, they quickly calmed down. Many bold students even walked out of the classroom, wanting to see what was going on. When they saw what was going on, they were instantly mesmerized by the wonderful scene in the sky!
"Wow! What a beautiful belt of light! That's the moon, right? The moon seems to be wearing a necklace. It's so beautiful! "
Someone exclaimed, and immediately, the students in the classroom ran out of the classroom to look up.
During a total solar eclipse, the sun would gradually be blocked. At this time, not only would the sky turn dark, but it would also show strange colors. The temperature would drop by a few degrees, and the wind would blow. The birds would think that the sun had set and would prepare to rest.
When the total solar eclipse began, the light from the sun's photosphere would continuously circle around the moon's edge until it surrounded the moon. At this time, the moon would look like it was wearing a necklace. The bright spots on the edge were called Bailey Beads. It looked very beautiful!
"Everyone, go into the classroom! Yamachō said that you can't look at the sun directly for too long. Otherwise, it will hurt your eyes! All students, go back to the classroom now! "
Even though the teachers of Yanhuang College could not help but marvel at the magnificent view in the sky, they still remembered Li Zexuan's instructions. Therefore, the teachers walked out of the classroom and chased the students outside into the classroom!
In the open-air courtyard on the fourth floor of Guang Hua Building, Li Chunfeng was looking at the sky with a pair of binoculars. He had completely forgotten about Li Zexuan's instructions. Right now, he wanted to stick his eyeballs on the binoculars so that he could not miss a single second!
"Huh? The light doesn't look right! "
All of a sudden, Li Chunfeng exclaimed in bewilderment, and his expression turned solemn.
.....
At the same time, hundreds of miles away from Shuofang City, a group of Turkic cavalry was marching towards Shuofang City.
There were about 20,000 of them. Even though the soldiers on the horses were not wearing heavy armor like the Black Armored Troops, the aura they exuded was not any weaker than the Black Armored Troops!
This was an elite force, the world-renowned Turkic Wolf Cavalry!
"Speed up a bit more! We have to reach Shuofang City before the Tang Army breaks through the city! "
The Turkic general who was leading the group turned around and shouted.
"Yes!"
The cavalry behind him replied loudly. Then, the entire group of cavalry rushed towards Shuofang City at an even faster speed, leaving a trail of dust behind them!
However, the leader of the Turkic Wolf Cavalry did not know that there were people waiting for him outside Shuofang City!
.....
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