Daming: I, Yang Xian, really govern Yang!

the next day.

After Xu Miaoyun arranged things in the house, she briefly explained her whereabouts to Miaojin, and then got on the rail train to Yangzhou alone.

By the time Xu Miaoyun arrived in Yangzhou, it was already evening.

She went directly to Yang Guogong's mansion, and after informing her name, she was quickly welcomed in.

At this time, Yang Xian was debugging the newly acquired astronomical telescope. After continuous experiments and improvements these days, the laboratory finally made this thing.

He stopped what he was doing and looked up at Xu Miaoyun. He didn't ask her why she was here, but just said: "Miss Xu, haven't you eaten yet?"

Xu Miaoyun shook her head slightly and said, "I just arrived in Yangzhou after a day's train ride."

"Then it's just the right time, let's have dinner together." Yang Xian said with a smile.

Xu Miaoyun paused for a moment, then immediately followed the good advice and said, "Then Miaoyun is harassing Duke Yang."

Guests and hosts do as they please, no matter how many questions Xu Miaoyun has in mind, since Yang Xian has spoken, she will not refuse.

From the first moment he saw Xu Miaoyun, Yang Xian was sure that this girl had something on her mind.

This was confirmed again when the two were eating.

Moreover, Yang Xian could probably guess why Xu Miaoyun came.

It's just that he didn't point it out.

After finishing the meal, Xu Miaoyun followed Yang Xian to the courtyard of the mansion.

Xu Miaoyun saw Yang Xian continuing to play with a long copper tube with a shelf underneath. She had the impression that when she came in the afternoon and saw Yang Xian, he was also playing with this thing.

Xu Miaoyun couldn't help but become curious, but she endured her temper and did not ask.

Just stood aside and watched silently.

While Yang Xian continued to adjust the astronomical telescope in his hand, he suddenly said: "Tomorrow is the Mid-Autumn Festival. The capital will be very lively these days."

Xu Miaoyun nodded and said: "At this time of year, many Mid-Autumn Poetry Festivals are held, and many scholars in the literary world will attend."

"Poetry party." Yang Xian sighed with emotion. In the Ming Dynasty, Tang poetry and Song lyrics were not copied. He probably had no chance to participate in such a grand event.

Xu Miaoyun did not understand the meaning of Yang Xian's words and continued: "This year's largest poetry gathering in the capital, the Qianxi Poetry Meeting, will be hosted by Song Liansong in person. There will definitely be another famous poem published by then."

For these traditional literati and officials, the bright moon in the sky is almost their spiritual companion.

From "raising your head to look at the bright moon and lowering your head to think about your hometown" to "I hope that people will live forever and share the beauty of the moon thousands of miles apart".

From "When will the bright moon come, ask the blue sky with wine" to "Raise a glass to invite the bright moon, and make three people in the shadows". Throughout the ages, countless literati and poets have told their thoughts to the bright moon, and finally turned them into masterpieces. Famous articles nourish and enrich the world of Chinese spiritual civilization.

Yang Xian's emotion made Xu Miaoyun misunderstand that Yang Xian regretted not being able to attend the poetry meeting in person. After all, in the eyes of outsiders, Yang Xian not only came from the Han Dynasty, but was also Liu Bowen's disciple.

"Do you want the moonlight?" Yang Xian finally finished the adjustment, raised his head and looked at Xu Miaoyun and asked.

"I like it." Xu Miaoyun said directly without any hesitation.

After all, in ancient times, this bright moon contained too many images.

"Want to see the real moon?" Yang Xian smiled.

"The real moon?" Xu Miaoyun was stunned for a moment, and then saw Yang Xian waving to him.

Xu Miaoyun walked to Yang Xian with doubts, and Yang Xian had already given up his position. Xu Miaoyun stood in front of the large astronomical telescope, and under Yang Xian's guidance, he looked up.

The two-foot-long astronomical telescope was pointed at the bright moon in the sky.

Through the astronomical telescope, what Xu Miaoyun saw was a ring of mountain depressions.

"This is this?" Xu Miaoyun stepped back, looked at Yang Xian and asked.

"What you see is the true appearance of the moon, and the thing in front of you is called an astronomical telescope, which is specially used to observe the starry sky." Yang Xian said with a smile.

After listening to Yang Xian's words, Xu Miaoyun came closer again. After a long time, her eyes moved away from the astronomical telescope.

"how could this be"

Xu Miaoyun originally imagined that there were osmanthus trees, toad palaces, jade rabbits, and the beautiful Fairy Chang'e on the moon.

And when she saw the moon just now, there were no trees, no water, not even any sign of life.

Not only that.

This time, when they looked at it from a distance on the ground, the bright and flawless moon was as bright as a silver plate, but it was actually filled with craters and holes.

The gap is so big, it’s like before a blind date, you thought the person you were dating was a smooth-skinned, flawless beauty through the WeChat photo, but when you arrived at the scene, what you saw was a big, numb and swollen face.

Xu Miaoyun froze on the spot and didn't say a word for a long time.

Obviously, the true appearance of the moon directly impacted her original world view. The moon palace, where countless beautiful legends were entrusted, turned out to be a dead and barren land.

"how could this be"

"There's nothing surprising about this." Yang Xian said calmly. "The moon is just a bumpy desert planet. There is neither Wu Gang who cut down the osmanthus tree in myths and legends, nor Chang'e who stole the elixir and flew to the moon palace. There is not even water or air there."

"The moon is a planet?" It was Xu Miaoyun who grasped the key point of Yang Xian's words immediately. At this moment, she ignored the shock in her heart and asked quickly. "Mr. Yang Guogong, what is a planet?"

"A planet is a spherical celestial body that moves according to certain laws in the universe, such as the sun, the moon, metal, wood, water, fire, and Saturn." Yang Xian paused and then said. "And the earth we walk on."

"Does Duke Yang support the Huntian theory?" Xu Miaoyun asked.

Yang Xian glanced at Xu Miaoyun, a little surprised. He didn't expect that the other party would know this. No wonder he had the name of a female student.

Many people in later generations mistakenly believe that the ancient Chinese did not know the information that the earth is round. It was the Italian Matteo Ricci who brought the understanding of the round earth to China, and believed that he was the one who introduced the round earth theory to China.

They thought that there was only one theory of a round sky and a square earth in ancient China.

But in fact, it's not.

As early as the Spring and Autumn Period and the Warring States Period, Zeng Zi once said: "If the sky is round and the earth is flat, then the four corners cannot be covered."

The meaning of this sentence is that if the sky is really round and the earth is square, then the four sides cannot be covered.

In addition to the Gaitian theory that the sky is round and the place is full, another theory is the Huntian theory mentioned by Xu Miaoyun.

"The sky is like a chicken's chicken, the celestial bodies are round like a bullet, and the earth is like a chicken's chicken with a yellow center."

The Huntian theory clearly states that the earth is spherical. This theory holds that all the stars in the sky are distributed on a "celestial sphere", and the sun, moon and five stars are attached to the "celestial sphere". This theory is very close to the concept of the celestial sphere in modern astronomy.

Never underestimate the wisdom of the ancients. (End of chapter)