"Son of God, why does it feel warmer when you go south?"
Wu looked at Han Cheng and asked, his eyes full of confusion.
Wu Ke had been harboring this doubt for a while, but he just saw the Son of God talking happily there, so he didn't say anything and waited for now.
After Wu asked such words, the senior brother and others were stunned for a moment, and they immediately came to their senses.
Yes, why does it get warmer as you go south?
Shouldn't the south side be similar to my own tribe?
Trade, in particular, was even more puzzled by this. He took many people from the trade team to the south.
Moreover, the original Huangguo tribe was located to the south of the tribe, but that spring, he, Shang and others, along with the people from the Huangguo tribe, almost failed to return.
It's not warm at all over there.
After hearing Wu's question, Han Cheng couldn't help but be stunned.
As a person living in the northern hemisphere, isn’t it common sense that the farther south you go, the warmer it gets?
In future generations, children will know things.
After being stunned like this, Han Cheng laughed.
Subconsciously, I looked at things according to the deep-rooted thinking of later generations.
However, this kind of thing may make some people speechless when asked. They know that this is a common sense question, but they just can't give a reason.
For Han Cheng, who came from a serious liberal arts major, there was no problem.
After all, back then, among the three minor subjects in liberal arts, geography was the one he studied best.
What about longitude, latitude, twilight line, perihelion, aphelion, tropic line, hot rise, cold fall... these should not be taken too casually.
Han Cheng whispered softly and shook his neck, feeling that it was time to start his performance.
"It's hotter in the south than here because it's closer to the sun.
The sun is a big fireball, just like we warm ourselves up to a fire. If we are far away from the fire, we will feel cold. If we are close to the fire, we will become warm..."
"Then why is it closer to the sun in the south?"
I don't know when the stone came over, suddenly asked with gleaming eyes, took over from the witch, and transformed into a hundred thousand whys.
When he was underage, Han Chenglian was coaxed and tricked into giving birth to the flying dream stone. He was very interested in this aspect of things.
Now when I heard Han Cheng say this, I was immediately attracted.
"This is because the earth we live on is a sphere. The center of the sphere in the south protrudes a lot, so the distance to the sun is closer to it."
After saying this, Wu and the others didn't quite understand. After thinking about it, they found a larger, rounder fruit and put it on the ground. They inserted a small wooden stick not far away and found a thin fruit.
Tie the rope to the wooden stick, then pull the rope with your hands and start measuring the round fruit.
The first thing to measure is the middle position of the fruit. After the measurement, make the next mark on the rope.
Then compare the top of the fruit.
Everyone was surprised to find that a rope of the same length could touch the middle of the fruit, but not the top. If you want to touch the top of the fruit, you need to use a longer rope.
"For example, the place where the stick is inserted is the sun, and this fruit is the earth we live on. Is it the middle part of the fruit closest to the sun?"
At this time, Han Cheng completely transformed into a high school geography teacher. However, when his geography teacher taught this, he did not use fruits, but the back of the head of the guy in the front row.
Although the tools are crude or makeshift, the effect is still relatively good. With such intuitive viewing, the people in the tribe, like Han Cheng at the time, immediately understood the distance between the center of the ball and the equator.
The principle of the sun being closest.
"As for you who have been to the south and feel that the south is the same as where we live and is not warmer than our tribe, that's because you haven't gone south enough and are too close to our tribe.
If you walk a little 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 Soaring Snake tribe, and then they were frozen by the cold there..."
Han Cheng continued to explain, and cited examples of the Wind Tribe and the Linfeng Tribe who had migrated to the north and then returned after being frozen.
This problem is understood, but new problems have arisen.
"Son of God, how can this...this land be a ball? Isn't it flat?"
It was still the stone that spoke.
After these words were spoken, the others were also very confused or looked at their son of God in surprise.
For 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.
There are mountain peaks, ravines, rivers, and flat land on this ground... How could this be round?
Fortunately, Han Cheng was facing these primitive people who knew nothing and whose ideological fields were as blank as a blank slate. If he were facing those extremely stubborn and self-righteous cynics, he would definitely be criticized verbally and written down.
!
In an era when there were no pictures of the entire earth, it was very difficult for this man in the tribe to accept that the land he stepped on was round, because it was so different from what everyone saw on a daily basis.
.
However, such things are not difficult for Han Cheng, who is a person with a liberal arts background.
Moreover, he was influenced by the geography teacher at that time, who was particularly good at drawing materials from anywhere and making model explanations.
Seeing everyone's confused looks, Han Cheng did not speak in a hurry, 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.
This kind of fruit is very familiar to the people in the tribe. Everyone among them has eaten it before, and there is nothing interesting about it.
But despite this, everyone still followed Han Cheng's request and observed carefully.
"Did you find anything?"
After a while, Han Cheng looked at everyone and asked with a smile.
Everyone scratched their heads in confusion, and then continued to stare at the fruit, but no flowers could be seen.
Wu and Shitou also found nothing.
“Isn’t the surface of this round fruit also uneven?”
Han Cheng said to everyone with a smile.
When everyone was reminded by Han Cheng, they immediately realized that this was indeed the case.
But after being enlightened, they became confused again because they didn't understand what this had to do with the question they asked the Son of God.
"If this fruit is expanded as hard as possible, will the small protrusions on the surface of the fruit become like these peaks and hills? Will the texture on the surface of the fruit be like the ravines we see?
?
The earth we live on is just like the fruit in my hand. Although the surface is uneven, it is still a ball."
Han Chengxiao said to everyone in the tribe.
Some people didn't react for a while, but some people understood something.
Shitou moved his eyes away from the round fruit in Han Cheng's hand and landed on the hill behind the courtyard. At the same time, his mind also recalled the things he had seen before, which were much bigger and higher than the hill.
Mountain.
After looking at it for a while, he moved his gaze back to the distant fruit held in Han Cheng's hand. Looking at the small bumps and shallow ravines on the surface of the fruit, his expression gradually became extremely shocked.
Such tall mountain peaks are just like these small protrusions on this fruit on the earth. So how big must this earth that the Son of God said be!
Looking at Shi Shi's expression, a smile appeared on Han Cheng's face. 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 really too big, and there are mountains and rivers on the surface to block it. We usually don't even notice such small differences.
Not coming out.
But when you get to a place where the field of view is wide enough and the ground is flat enough, you can realize that the earth is round.
At that time, when we saw trees growing in the distance, the first thing we saw was the treetops, and the last thing we saw was the bottom of the tree..."
Han Cheng smiled and continued to educate these people in the tribe.
Once upon a time, Han Cheng had a plan. When people in the tribe asked where the mountains and rivers came from, he would tell them the legend of the great god Pangu who created the world.
When asked about the shape of the earth, I explained it in terms of a round sky and a square place.
Because if explained in this way, it is very similar to what everyone sees every day, and it can make people understand it better.
But today, his thoughts suddenly changed.
Because he realized that if he really did this, the descendants of the Qingque tribe would take many detours in the future.
I don’t know how many years it will take to realize that the sky is endless and the earth we live on is round.
Compared with things like this, the difficulty of understanding at this time is not a difficulty at all.
And while talking like this, Han Cheng also had a bold idea.
After he released the fact that the earth he lives in is a huge sphere, later on, among the descendants of the Qingque tribe, will anyone have the idea that the world is so big and I want to see it?
Then he took the fleet on a long voyage, embarked on a feat of sailing around the world, and made great geographical discoveries along the way.
Then began the era when the descendants of the Qingque tribe spread all over the world, and brought back all the peppers, sweet potatoes, corn, potatoes and other things from the Americas, and by the way, Mandarin became the only official language...
Just thinking about this makes people feel very excited.
"In fact, the earth is not just a round ball, it is always rotating."
Han Cheng was talking about rising today, so he didn't even peel the rabbit. Together with Wu and others, he came to the big blue brick house and told everyone 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 talk.
Han Cheng thought for a while and asked all interested people in the tribe to come and listen to the lecture.
It is also time to educate everyone in the tribe about these aspects of knowledge.
Knowing these aspects of knowledge can greatly broaden the horizons of everyone in the tribe, and will subtly make people's situation bigger.
After developing to a certain level, you will not become arrogant and think that you occupy the center of the entire world, and start to stand still.
After everyone arrived, Han Chengcheng began to tell the people in the tribe about the rotation of the earth.
After these words were spoken, the people in the tribe were even more surprised.
For them, this is simply more incomprehensible than the fact that the earth they live in is a sphere.
The earth has always been spinning, but I and others have never felt it!
I remember when I was young, I would feel dizzy if I walked around for a while.
The world we live in is spinning all the time now, so why don’t I feel dizzy?
"This is because the earth only rotates once a day, and it rotates very slowly, so you don't feel dizzy. If you don't believe me, slowly rotate around on the ground and try to see if you still feel dizzy?"
Han Cheng smiled and said to those people in the tribe who were curious about his head not getting dizzy.
"Why are there day and night? Why does the sun rise in the east and set in the west?"
After several people slowly turned around in a circle according to what Han Cheng just said, and found that their heads were not dizzy at all, Han Cheng smiled at everyone and once again threw such a seemingly simple thing, but it was enough to make them lose their hair.
question.
As expected by Han Cheng, after these two questions were raised, everyone in the tribe was immediately confused.
Why is there day and night? Why does the sun rise from the east and set from the west?
this……
These things have been like this since they started to understand!
They just exist like this, no reason why!
Everyone scratched their heads. Even people like 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 seemingly ordinary problems at first glance were actually unsolvable problems before the development of modern science.
When the ancient ancestors faced this kind of unexplainable problem, they began to use their own imagination. As a result, the golden crow, Xihe driving the sun chariot, these mythical stories representing mysterious power appeared.
"That's because the earth is spinning."
After waiting for a while, Han Cheng began to explain the reason to everyone.
After Han Cheng said this answer, everyone in the tribe was full of confusion. They really couldn't understand the connection between the earth's rotation and day and night, and the sun rising in the east and setting in the west.
Han Cheng knew that everyone was confused, so he smiled and said: "You will understand what's going on after I demonstrate it."
After saying that, he asked people to close all the doors and windows of the large blue brick house with tiles, and put down the animal skin curtains that did not transmit much light. The entire large blue brick house with tiles was immediately plunged into darkness.
When everyone was curious, a fire lit up in front. Han Cheng blew out the fire stick and lit the oil lamp.
After doing this, Han Cheng used his nails to make 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 hold the two ends of the fruit with your thumb and index finger and tilt it slightly to make a simple globe.
Then he moved the oil lamp in front of him.
"This oil lamp is equivalent to the sun hanging in the sky at this time, and the fruit in my hand is equivalent to the earth we live on.
The mark I made on the fruit with my fingernails is equivalent to the location of our tribe on the earth."
After Han Cheng finished this, he looked at the people in the tribe and said.
In the entire blue brick and tiled house, only Han Cheng's voice sounded.
The rest of the people were all distracted by the two questions Han Cheng asked before and what they were doing now.
They were all listening and watching 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 took a look at everyone and saw that everyone was extremely serious, and felt very satisfied.
Dang Ji continued: "Look, the fruit in my hand is only illuminated on the side facing the light, and the other side is not illuminated by the light.
The side that is illuminated is day, and the side that is not illuminated is night."
Everyone thought about what they saw in daily life, where there was sunshine during the day but no sunshine at night, and then compared it with what Han Cheng said and did now, and they could easily understand the difference between day and night.
"Look everyone, the earth is starting to rotate now. 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 use his other hand to slowly turn the fruit in his hand from west to east.
As Han Cheng turned, the mark that was originally illuminated by the light and represented the location of the Qingque tribe slowly moved to a place where the light could not reach it.
"Look, now that the light is gone, darkness has fallen."
Han Cheng said this, paused for a while, and waited until everyone could see clearly before continuing 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 and returned to the light, illuminated by the light.
"Now, the earth has turned around and the sky has become bright again."
Han Cheng stopped his movements again, looked at the people in the tribe, and said with a smile.
Everyone looked at the fruit illuminated by the light in Han Cheng's hand without blinking, recalling the magical scene that the Son of God showed them through this fruit just now.
Some people looked surprised and thoughtful, as if something extremely mysterious was slowly opening up in front of their eyes, and the whole world suddenly became wider.
Some people looked at these and were full of curiosity, thinking that this had never happened before and the rhetoric was very novel.
There are also some people scratching their heads with their hands.
These things in front of them were clearly explained by the Son of God, and they all looked at them, but they just couldn't understand what they meant.
Why does the earth rotate, why does day turn to night, and why do the little dots on the fruit become their own tribe?
But even though I can't understand it, it still seems very profound and very reasonable.
Han Cheng also noticed everyone's reaction, as did those who were scratching their heads.
However, Han Cheng did not feel frustrated by this.
Not everyone needs to understand this matter, only some people need to know it.
Moreover, this is only the first time he has talked about these things in the tribe, so it is understandable that many people in the tribe have difficulty understanding them.
Because even in later generations, many liberal arts students still have a headache about geography, especially when it comes to the morning and evening lines, calculating longitude and latitude, etc., and they want to rub their heads.
It is completely normal for some people to not understand at this time.
In fact, Han Cheng felt very surprised when he looked at the few people who looked astonished or enlightened.
I have discovered some talents in the tribe again!
After Han Cheng paused for a while, he continued to repeat the actions just now, and tried his best to explain the relationship between the earth's rotation and day and night as clearly as possible so that more people could understand.
After a while, Han Cheng began to ask: "Many people already understand how day and night are created. Now I want to ask if anyone knows why the sun rises in the east and sets in the west.
?”
After he finished speaking, he looked at everyone and saw that everyone was staring blankly, not understanding what was going on.
Shitou and others who had figured out what happened during the day and night had some vague ideas, but they just couldn't grasp them.
Han Cheng was not anxious when he saw this, but said: "Take a closer 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 mark representing the Qingque tribe on the fruit was illuminated by light for a while, and then disappeared into darkness.
"Son of God! I know!"
Shi Shi watched Han Cheng's movements attentively, his eyes getting 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.
"It's because the earth rotates from west to east!"
After Shitou got Han Cheng's permission, he stood up from his seat and spoke excitedly, especially like the minors he taught before.
Han Cheng cast an approving look at Shitou, and Shitou's words hit the point.
"Tell me more and see if you can go into more detail."
After Han Cheng approved Shi Shi's answer just now, he looked at him and said encouragingly.
"this……"
Shitou didn't know what to say for a moment.
Han Cheng promptly turned the fruit in his hand that served as a globe.
"Yes, it's because when turning from west to east, the easternmost side of a place is illuminated by the sun first, and when the sun finally disappears, it disappears from the west side of that place..."
After Shitou thought for a while, he spoke again, with some uncertainty.
"sharp!"
After Shitou finished speaking, Han Cheng put the fruit in his hand on the table, gave Shitou a double thumbs up, and expressed his highest appreciation for Shitou's words.
Even though Han Cheng gave a reminder, Shitou still deserves Han Cheng's praise for being able to say such words!
