"Son of God, why is it warmer when we go south?"
Wu looked at Han Cheng and asked, his eyes full of confusion.
The witch had been wondering about this for quite some time, but seeing the Son of God talking excitedly, he hadn't said anything until now.
After Wu asked this question, the eldest brother and others were stunned, and then they reacted.
Yes, why does it get warmer when you go south?
Shouldn't the south be similar to our tribe?
Mao was especially puzzled by this, as he had often traveled south with his trade team.
Moreover, the original Huangguo tribe was in the south of the tribe, but in the spring of that year, he, Shang and others, along with the people of the Huangguo tribe, almost could not return.
It's not warm over there at all.
After hearing Wu's question, Han Cheng couldn't help but was stunned.
As a person living in the northern hemisphere, isn't it common sense that the further south you go, the warmer it gets?
In later generations, even children know what's going on.
After being stunned for a moment, Han Cheng started to laugh.
Subconsciously, I look at things according to the deep-rooted thinking of later generations.
However, such questions may leave some people speechless. They know that this is a common sense question, but they just can't explain it.
For Han Cheng, who graduated from a liberal arts class, this was not a problem.
After all, among the three minor subjects in liberal arts, geography was his best subject.
Things like longitude, latitude, terminator, perihelion, aphelion, tropic of cancer, thermal rise, cold fall... these are so random.
Han Cheng softened his throat, shook his neck, and felt that it was time to start his performance.
“The south is hotter than this side because it is closer to the sun.
The sun is a big fireball, just like when we sit by the fire, if we are far away from the fire, we will feel cold, but if we are close to the fire, we will feel warm..."
"Then why is the south closer to the sun?"
I don't know when the stone came over, and asked with blinking eyes, taking over the witch's position and turning into a hundred thousand whys.
Before he reached adulthood, Shi Tou was coaxed and fooled by Han Cheng into dreaming of flying, and he is very interested in this kind of things.
Now after hearing Han Cheng say this, I was immediately attracted.
"This is because the earth we live on is a sphere, and the south is in the middle of the sphere, protruding a lot, so the upper part is closer to the sun."
After saying this, seeing that Wu and the others didn't quite understand, he thought for a while, found a relatively large, round fruit and placed it on the ground, then stuck a small wooden stick not far away, found a thin rope and tied it to the stick, then started pulling the rope with his hands and began to measure it towards the round fruit.
The first thing to measure is the center of the fruit. After measuring, make a mark on the rope.
Then measure the top of the fruit.
Everyone was surprised to find that a rope of the same length could reach the middle of the fruit but could not reach the top of the fruit. If they wanted to reach the top of the fruit, they would need a longer rope.
"For example, the place where the stick is inserted is the sun, and the fruit is the earth we live on. Is the middle part of the fruit closest to the sun?"
At this time, Han Cheng had completely transformed into a high school geography teacher, but when his geography teacher was explaining this, he did not use fruit, but the back of the head of the guy with a crew cut in the front row.
Although the tools were crude or makeshift, the effect was still quite good. With such an intuitive observation, the people in the tribe, like Han Cheng at the beginning, immediately understood that the center of the ball, similar to the equator, was closest to the sun.
"As for you having been to the south and feeling that the south is the same as where we live and no warmer than our tribe, that's because you didn't go far enough south and were too close to our tribe.
If you walk farther south, it will get warmer.
You can ask the old primitive people about this. They once went to live in the north because of the persecution of the Tengshe tribe, but were frozen back by the cold there..."
Han Cheng continued to explain and cited the example of the Feng tribe and the Linfeng tribe, which had once migrated to the north but later returned due to the cold.
This problem is understood, but new problems arise.
"Son of God, how can this... this ground be a sphere? Isn't it flat?"
The opening is still made of stone.
After these words were spoken, the rest of the people looked at their Son of God in confusion or surprise.
To them, this is even more incomprehensible than the fact that the south is warmer than the north.
You know, they have been living on the earth since they were born.
This ground has mountains, gullies, rivers, and plains... How can it be round?
Fortunately, Han Cheng was facing these ignorant primitive people whose thoughts were as blank as a sheet of paper. If he was facing those extremely stubborn and self-righteous cynics, he would definitely be criticized and blasted into a sieve!
In an era when there were no full-scale photos of the earth, it was very difficult to make the people in the tribe accept the view that the earth under their feet was round, because it was so different from what everyone saw in daily life.
However, such things are not difficult for Han Cheng, since he is a liberal arts graduate.
Moreover, he was influenced by his geography teacher at that time, who was good at using materials from anywhere to create model explanations.
Seeing everyone's puzzled expressions, Han Cheng did not rush to speak, but calmly found a model of the earth.
That's right, it's the fruit just now.
"Look carefully at the surface of this fruit."
Han Cheng held the fruit in his hand and showed it to everyone in the tribe.
The people in the tribe are very familiar with this fruit. Everyone of them has eaten it before. There is nothing good about it.
However, despite this, everyone still observed carefully according to Han Cheng's request.
"Did you find anything?"
After a while, Han Cheng looked at everyone and asked with a smile.
Everyone scratched their heads in confusion, and continued to stare at the fruit, but they still couldn't see a flower.
Wu and Shitou also found nothing.
"Is the surface of this seemingly round fruit uneven?"
Han Cheng said to everyone with a smile.
When Han Cheng reminded everyone of this, they immediately realized that it was indeed the case.
But after they suddenly realized it, they became confused again because they didn't understand what this had to do with the questions they asked the Son of God.
"If you expand this fruit as much as possible, will the small protrusions on the surface of the fruit become like these peaks and hills? Will the lines on the surface of the fruit become like the gullies we see?
The earth we live on is like the fruit in my hand. Although its surface is not flat, it is still a sphere. "
Han Cheng smiled and said to everyone in the tribe.
Some people didn't react for a while, but some people understood something.
Shitou shifted his gaze from the round fruit in Han Cheng's hand to the small hill behind the courtyard. At the same time, a mountain he had seen before, which was much larger and higher than the small hill, emerged in his mind.
After looking at it for a while, he shifted his gaze back to the fruit in Han Cheng's hand. Looking at the small bumps and shallow grooves on the surface of the fruit, his expression gradually became extremely shocked.
Such tall mountains on the earth are just like these small protrusions on this fruit. So how big must this earth that the Son of God talked about be!
Looking at Shi Tou's expression, Han Cheng smiled. He knew that this smart guy understood what he said.
“The reason why we feel that the land we live on is flat is because the Earth we live on is so huge, and there are mountains and rivers blocking the surface, so we cannot feel such subtle differences at all.
However, once you get to a place with a wide enough view and a flat enough ground, you will be able to realize that the earth is round.
At that time, when we saw a tree growing in the distance, we first saw the treetops, and the last thing we saw was the bottom of the tree..."
Han Cheng smiled and continued to explain science to the people in the tribe.
Once upon a time, Han Cheng had a plan that when people in the tribe asked about the origins of mountains and rivers, he would bring up the legend of how the great god Pangu created the world.
When asked about the shape of the earth, he explained it by saying that the sky is round and the earth is square.
Because this explanation is very similar to what people see every day, and it allows people to understand it better.
But today, his thoughts have changed all of a sudden.
Because he realized that if he really did that, the descendants of the Qingque tribe would have to take many more detours.
I don't know how many years it will take before I know that the sky is endless and the earth we live on is round.
Compared with things like this, the difficulty in understanding at this moment is not a difficulty at all.
And while talking like this, Han Cheng also had a bold idea.
After he revealed the fact that the earth they live on is a huge sphere, will any of the descendants of the Green Bird tribe think that the world is so big and they want to go and see it?
Then he led his fleet on a long voyage, embarking on the feat of circumnavigating the world, and incidentally made great geographical discoveries.
Then began the era when the descendants of the Greenbird tribe spread all over the world, and brought back peppers, sweet potatoes, corn, potatoes and other things from America, and made Mandarin the only official language...
This matter makes people feel very exciting just thinking about it.
"In fact, the earth is not just a sphere, it is also rotating all the time."
Han Cheng was so excited today that he didn't even peel the rabbit. He went to the big blue brick and tile house with Wu and the others and told them more about astronomy and geography.
Because it is much warmer inside the house than outside.
At this time, more people came to listen to Han Cheng's stories.
Han Cheng thought about it and asked everyone in the tribe who was interested to come and listen.
It is also time to educate everyone in the tribe about these aspects.
Knowing these aspects of knowledge can greatly broaden the horizons of the tribe members and will subtly expand their vision.
After developing to a certain level, we will not become arrogant and think that we occupy the center of the world and start to be complacent.
After everyone arrived here, Han Cheng began to tell everyone in the tribe about the rotation of the earth.
After these words were spoken, the people in the tribe were even more surprised.
To them, this is even more incomprehensible than the fact that the earth they live on is a round sphere.
The earth has been spinning all the time, but I and others have never felt it!
I remember when I was little, I would feel dizzy after spinning around for a while.
The earth we live in is always spinning, so why don’t I feel dizzy?
"This is because the earth only rotates once a day, and it rotates very slowly, so you won't feel dizzy. If you don't believe me, try to slowly rotate on the ground and see if you still feel dizzy."
Han Cheng said with a smile to those people in the tribe who were curious about why he was not dizzy.
"Why are there day and night? Why does the sun rise in the east and set in the west?"
After a few people turned around slowly as Han Cheng had said and found that they were not dizzy at all, Han Cheng smiled at everyone and asked this seemingly simple question again, which was enough to make them lose their hair.
As Han Cheng expected, after these two questions were raised, everyone in the tribe was immediately at a loss.
Why are there day and night? Why does the sun rise in the east and set in the west?
this……
These things have been like this since they started to understand things!
They just exist, there's no reason why!
Everyone scratched their heads. Even Wu, Yuan, and Shitou, who thought they were smart, were left speechless by this seemingly ordinary question.
Han Cheng couldn't help but smile when he saw this.
These two problems, which seem very common at first glance, were actually unsolvable problems before the development of modern science.
Faced with this unexplainable problem, the ancient ancestors began to give full play to their imagination. Thus, mythological stories representing mysterious powers such as Jinwu and Xihe driving the sun god's chariot came into being.
"That's because the earth is spinning."
After waiting for a while, Han Cheng began to explain the reasons to everyone.
After Han Cheng gave this answer, everyone in the tribe was full of confusion. They really couldn't understand what the connection was between the rotation of the earth and day and night, and the rising and setting of the sun.
Han Cheng knew that everyone was confused, so he smiled and said, "Wait for me to demonstrate and you will understand what is going on."
As he spoke, he ordered people to close all the doors and windows of the large blue brick and tile house, and to lower the animal skin curtains that were not very light-transmissive. The entire large blue brick and tile house was immediately plunged into darkness.
When everyone was curious, a fire lit up in front of them. Han Cheng blew out the tinder and lit the oil lamp.
After doing all this, Han Cheng used his fingernails to leave a mark on the fruit.
Then take the fruit in your hand again.
But this time is different from before. Instead of holding it with your hands, you pinch the two ends of the fruit with your thumb and index finger and tilt it slightly to make a simple globe.
Then move the oil lamp in front of you.
“This oil lamp is like the sun in the sky, and the fruit in my hand is like the earth we live on.
The mark I made with my fingernails on the fruit represents the location of our tribe on Earth."
After Han Cheng finished this, he looked at the people in the tribe and spoke.
In the entire blue brick and tile house, only Han Cheng's voice was heard.
The rest of the people were all attracted by the two questions Han Cheng had raised before and what they were doing now.
They all listened and watched attentively.
I want to understand from the Son of God why there are day and night, and why the sun rises in the east and sets in the west.
Han Cheng glanced at everyone and was very satisfied to see that they were all extremely serious.
He immediately continued, "Look, now the fruit in my hand has only the side facing the light illuminated, while the other side is not illuminated by the light.
The illuminated side is day, and the unilluminated side is night."
If everyone thought about the situation they usually see where there is sunshine during the day and no sunshine at night, and compared it with what Han Cheng is saying and doing now, it would be easy to understand the difference between day and night.
"Everyone, look! The earth is starting to rotate. At this moment, this point representing our Qingque tribe is being illuminated by light, so it is daytime..."
As Han Cheng spoke, he began to slowly turn the fruit in his hand with his other hand, from west to east.
As Han Cheng turned, the mark representing the location of the Qingque tribe, which was originally illuminated by the light, slowly moved to a place where the light could not reach.
“Behold, now the light does not shine, and darkness has fallen.”
Han Cheng said this and paused for a while. After everyone had seen it clearly, he continued to turn the fruit in his hand.
Still turning from west to east.
After a while, the mark on the fruit reappeared from the darkness into the light and was illuminated by the light.
"Now, the earth has turned once, and the sky is bright again."
Han Cheng stopped what he was doing again, looked at the people in the tribe, and said with a smile.
Everyone stared at the fruit illuminated by the light in Han Cheng's hand without blinking, recalling the magical scene that the Son of God had shown them through this fruit just now.
Some people showed expressions of surprise and thought, as if something extremely mysterious was slowly opening up before their eyes, and the whole world suddenly became open.
Some people looked at these with curiosity, thinking that these were things they had never seen before and the expressions were very novel.
Some people were scratching their heads with their hands.
The Son of God had clearly explained these things in front of them, and they all read them, but they just couldn't understand what they meant.
What about the earth turning, the day turning into night, and how did the small dot on the fruit become my tribe?
Although I can't understand it, it still seems very profound and makes sense.
Han Cheng saw everyone's reactions, including those who were scratching their heads.
However, Han Cheng did not feel frustrated about this.
It is not necessary for everyone to understand this matter, only some people need to know it.
Moreover, this was only the first time he talked about these things in the tribe, so it was understandable that many people in the tribe found it difficult to understand.
Because even in later generations, many liberal arts students still have a headache about geography, especially when it comes to the terminator, calculating longitude and latitude, etc., they wish they could rub their heads bald.
It is normal that some people don’t understand at this time.
Even when he looked at those people who showed expressions of sudden realization or enlightenment, Han Cheng felt very surprised.
I have discovered some talents in the tribe again!
After pausing for a while, Han Cheng continued to repeat the previous action and tried his best to explain the relationship between the earth's rotation and day and night more clearly so that more people could understand.
After a while, Han Cheng began to ask questions: "Many people have already understood how day and night came into being. Now I want to ask, does anyone know why the sun rises in the east and sets in the west?"
After he finished speaking, he looked at everyone. They all stared at each other, not understanding what was going on.
Shi Tou and some other people who had figured out what day and night were doing had some vague ideas, but they just couldn't grasp them.
Han Cheng was not in a hurry when he saw this, but said: "Take another good look at the movement of the earth."
As he spoke, he continued to slowly turn the slightly tilted fruit in his hand.
As he turned the fruit, the mark on the fruit that represented the Qingque tribe was illuminated by the light and then disappeared into darkness.
"Son of God! I get it!"
Shi Tou watched Han Cheng's movements intently, his eyes becoming brighter and brighter. After a while, he finally shouted in surprise and raised his right hand high.
"Then tell me why."
Han Cheng stopped what he was doing, looked at the stone and said with a smile.
"Because the earth rotates from west to east!"
After getting Han Cheng's permission, Shitou stood up from his seat and spoke excitedly, just like the minors he had taught before.
Han Cheng cast an approving look at Shi Tou. Shi Tou's words hit the nail on the head.
"Tell me more and see if you can give me more details."
After Han Cheng approved of Shi Tou's answer, he looked at him and said encouragingly.
"this……"
Shi Tou didn't know what to say for a moment.
Han Cheng then turned the fruit in his hand that served as a globe at the right time.
"Yes, because when turning from west to east, the easternmost part of a place is illuminated by the sun first, and when the sun disappears last, it disappears from the west of that place..."
After thinking for a while, Shitou spoke again, with some uncertainty.
"sharp!"
After Shi Tou finished speaking, Han Cheng put the fruit in his hand on the table and gave Shi Tou two thumbs up, expressing his highest praise for Shi Tou's words.
Even though Han Cheng gave the hint, Shitou still deserves Han Cheng's praise for being able to say such words!
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