There are stars in the night sky.
Beside the fire, Su Jing and Zhu Biao sat opposite each other.
The sweet potatoes emit a charming aroma when roasted by the flames.
In this situation, Su Jing chanted lightly:
"Raise your head to look at the bright moon, lower your head to miss your hometown."
Zhu Biao on the side said: "Master Su, there is no moon today."
Su Jing rolled her eyes at Zhu Biao: "I don't have the eyesight to see!"
Zhu Biao was a little innocent, because it was Su Jing who taught him to talk about things and be truthful and pragmatic.
There is no moon in the sky right now.
After being scolded by Su Jing, Zhu Biao simply said nothing and started roasting the sweet potatoes, waiting for them to ripen.
Soon, the sweet potatoes will be ready.
The two of them each picked up one, which was only enough to burn their mouths, and tasted it.
After being blessed by the fire, the sugar content of the sweet potato is stimulated.
sweet!
sweet!
So sweet!
Zhu Biao killed one of them three times, five times and two times, but he still had some unfinished ideas.
But seeing that Su Jing hadn't finished eating yet, he couldn't continue to take it.
The etiquette of respecting teachers and teaching must be maintained at all times.
Su Jing saw Zhu Biao's look and said helplessly: "Niu Yi, I've told you many times, don't make such a distinction between superiority and inferiority."
"It's true that you are my student, but you don't have to eat a roasted sweet potato to see how I look on my face."
"It's just the two of us here. Let's put aside all the red tape. Why don't you just relax?"
"Isn't it nice to remind me just now that there is no moon!"
Although Su Jing knew that Zhu Biao was showing courtesy, he, a modern man, really felt awkward.
It’s as if I’m still in the workplace, and everything my employees do depends on what I, the boss, want.
Uncomfortable!
"I'm sorry, Master Su. The student didn't do well. Please forgive me, Master Su."
Zhu Biao immediately said to Su Jing, which directly numbed Su Jing.
Su Jing was really convinced.
"Forget it, I won't say it anymore. It's boring. You can just eat another one."
After saying that, Su Jing directly pulled out another roasted sweet potato and threw it into Zhu Biao's hand.
I'll bring it to you personally so you can eat it with confidence.
"Thank you Master Su."
Zhu Biao thanked him and continued eating.
Not long after, both of them finished eating a few roasted sweet potatoes.
Su Jing took advantage of the situation, looked at the sky and sighed: "No matter what time, the sky looks the same."
Whether now or in ancient times, the sky has not changed that much.
At least Su Jing couldn't tell.
"It's a pity that my telescope hasn't been adjusted yet, otherwise I could try to see the stars."
Su Jing sighed again.
He knew the principles of making telescopes, and he had also made the glass.
However, this is purely hand-polished, and the accuracy can only be said to be acceptable.
It's okay to see people and objects in the distance, but if you want to see the stars, you have to adjust it slowly.
"Master Su also knows the art of stargazing? What is a telescope?"
Zhu Biao asked curiously. By Su Jing's side, he could always come into contact with all kinds of novel things.
Su Jing said calmly: "Let's come one by one. Let me answer you first. A telescope, as the name suggests, is a device that can see distant objects. The one I made can probably see several miles away."
"Can you see things clearly from miles away? Are telescopes really so magical?"
Zhu Biao said in surprise.
For Zhu Biao, can it
Su Jing said lightly: "I have never lied to you before. It's just that I wasn't very good at making that thing. It hurt my eyes to see it too much, so I never took it out in front of you."
With hand-polished convex and concave lenses, it’s not easy to get the focus right.
Of course, Su Jing is not in a hurry, just take her time.
"When Master Su is ready, please let the students observe and practice."
Zhu Biao said expectantly.
This can observe things inside and outside, and has many uses.
Su Jing said lightly: "Whatever, I can give you one when the time comes. As for the stargazing you mentioned, I don't know how to do it. I just look at the stars."
Zhu Biao said: "Stars are celestial phenomena that can predict good and bad luck. They determine the agricultural time of the calendar. Take a look at what Master Su said. What does it mean?"
The Ming Dynasty also set up a special department to observe astronomical phenomena, Si Tianjian.
"Just observing and seeing what the stars look like."
Su Jing said calmly: "It's good to use the stars to determine the calendar year, but predicting good or bad luck is nonsense."
"The world we live in is actually a star, but it's just a bigger star."
Su Jing's words had a great impact on Zhu Biao. What do you mean by a bigger star?
His mind was confused.
Seeing this, Su Jing decided to popularize science and immediately asked: "Niu Yi, what do you think our world is like?"
Zhu Biao replied: "The sky is round and the earth is square, which has existed since ancient times."
"It seems that your Confucian teacher must be very knowledgeable."
Su Jing said with a smile.
Zhu Biao frowned and said, "How does Master Su know?"
Zhu Biao's Confucian lecturer was Song Lian, a serious Confucian master.
But Zhu Biao never revealed his identity, so Su Jing probably didn't know.
Su Jing smiled and said: "It's nothing, it's just that if your teacher teaches you a little more astronomy knowledge, you will know that the sky is round and the square is wrong."
Su Jing knew that the round sky and square earth should accurately refer to a philosophical thought.
The sky is in motion, while the earth is still.
The round sky and the square place symbolize the combination of movement and stillness.
Of course, he also planned to talk to Zhu Biao more about this.
If you talk too much about something like philosophy, you will easily fall into it, and you may become autistic.
It’s better for children to speak something they can understand.
"Why did Master Su say that?"
Zhu Biao asked rhetorically.
Su Jing said calmly: "Zengzi once said that if the sky is round and the earth is flat, then the four corners cannot be covered."
If the sky is really round and the earth is really square, then the four corners cannot be covered.
"If the sky is big and the earth is small, it can be explained."
Zhu Biao retorted.
Su Jing asked again: "Then have you seen where the end of the earth is?"
Zhu Biao was stunned for a moment, and Su Jing continued: "Zhang Heng of the Eastern Han Dynasty said in "Notes on the Armillary Sphere" that the cloudy sky is like a chicken's egg, and the earth is like the yolk of an egg. Living alone inside, the sky is big and the earth is small."
Although what Zhang Heng said was not entirely correct, it was enough to explain to Zhu Biao.
Zhu Biao asked doubtfully: "Master Su, if we follow this statement, wouldn't the earth be round? But as far as we can see, the earth is flat."
The ground is like the yolk of an egg, and the yolk is round.
Su Jing said calmly: "Niu Yi, you said you have been to the beach, then you have seen a sailboat?"
"Of course I've seen it before."
Zhu Biao nodded.
Su Jing asked: "When a ship approaches from a distance, which part of the ship is the first thing you see?"
Zhu Biao just recalled it and said, "Of course it's the top of the ship's mast."
"Then think about why this is?"
Su Jing smiled and stopped explaining.
Zhu Biao closed his eyes and thought, and quickly understood the connection.
"Master Su, I understand. If the ground is flat, then when the ships come over, they should be seen together. Instead, they should see the top of the mast first, and then slowly get to the hull."
Zhu Biao said excitedly: "It turns out that the earth is really round."
He was a little excited. Normally, the teachers at the main hall would not teach him these things.
Su Jing said casually: "As long as you know, that's enough. The stars are the same. It's just that they can't treat others."
(End of chapter)
