"Miko, why is it warm to go south?"

Wu looked at Han Cheng and asked, his eyes full of puzzlement.

Wu Ke has been in this doubt for a while, but he just saw that the Son of God had been talking happily there, so he didn't say it, and waited for now.

After Wu asked such words, Senior Brother and the others were also stunned, and immediately reacted.

yes, why does it get warmer when you go south?

Isn't it supposed to be similar to the south of your tribe here?

Especially Mao, who was even more puzzled by this, he led the people of the trade team, but he went south.

Moreover, the original Huangguo tribe was in the south of the tribe, but in the spring of that year, he and Yan and others, with the people of the Huangguo tribe, almost couldn't come back.

It's not warm at all.

After hearing Wu's question, Han Cheng couldn't help but be stunned.

As a person living in the northern hemisphere, the further south you go, the warmer it is, isn't this kind of thing, isn't it common sense?

In the Hereafter, children know everything.

After being stunned like this, Han Cheng laughed.

I subconsciously looked at things according to the deep-rooted thinking of later generations.

However, such a thing may be able to leave some people speechless, knowing that this is a common-sense question, but they just can't say why.

For Han Cheng, a person from a formal liberal arts class, there is no problem.

After all, at the beginning, among the three sub-subjects of liberal arts, he studied geography the best.

What longitude, latitude, dawn and dusk, perihelion, aphelion, tropic of cancer, heat rise, cold fall...... These are simply not too casual.

Han Cheng shook his neck lightly, feeling that it was time to start his own performance.

"It's hotter in the south than here because it's closer to the sun.

The sun is a big ball of fire, just like when we bake a fire, when we are far away from the fire, it will be cold, and when we are close to the fire, it will become warm......"

"Then why is the south so close to the sun?"

I don't know when the stone came over, and his eyes flashed and asked out loud, taking over from the witch and turning into a hundred thousand why.

When he was not an adult, he was coaxed by Han Cheng to produce the stone of the flying dream, and he was very interested in this aspect of things.

Now when he heard Han Cheng say this, he was immediately attracted.

"This is because the earth we live on is a round sphere, and the south is the middle of the ball, which protrudes a lot, so it is closer to the sun when it goes up."

After saying this, they didn't understand much, so they thought about it and found a relatively large, round fruit and put it on the ground, and inserted a small wooden stick not far away, and found a thin rope to tie to the wooden stick, and then opened the rope with his hand and began to weigh the round fruit.

The first measure is the middle of the fruit, and after the measurement, make a mark on the string.

Then measure the top of the fruit.

Everyone was amazed 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, and if you wanted to reach the top of the fruit, you needed to use a longer rope.

"For example, the place where the stick is planted is the sun, and this fruit is the earth we live in, is it the middle part of the fruit, which is closest to the sun?"

At this time, Han Cheng completely incarnated as a high school geography teacher, but when his geography teacher was talking about this, he didn't use fruit, but the back of the head of the guy in the front row.

Although the tools are simple, or they are a little improvised, the effect is still relatively good, and under such an intuitive view, the people in the tribe, like Han Cheng at the beginning, suddenly understood the truth that the middle of the ball, similar to the equator, is closest to the sun.

"As for the fact that you have been to the south, and you think that the south is the same as the place where we live, it is not warmer than our tribe, and that is because you have not gone far enough to the south, it is too close to our tribe.

Walk a little further south, and it will get warmer.

You can ask the old primitives about this, they once went to live in the north because of the persecution of the Teng Snake tribe, and then they were frozen back by the cold over there......"

Han Cheng continued to explain, and cited the Wind Tribe and the Neighboring Wind Tribe who had migrated to the north and returned after being frozen.

The problem is understood, but a new problem arises.

"Son of God, this... How can this earth be a ball? Isn't it a flat one? ”

The opening is still stone.

After these words were spoken, the rest of the people looked at their Son in great confusion or amazement.

For them, this is even more incomprehensible than the south being warmer than the north.

You know, they've been living on the earth since they were born.

There are mountains, ravines, rivers and flat land...... How could this be round?

Fortunately, Han Cheng was facing these primitive people who knew nothing and the ideological field was like a blank sheet of paper at this time, if he was facing those extremely stubborn and self-righteous cynics, he would definitely be sprayed into a sieve by verbal criticism!

In the era when there are no pictures of the whole earth, it is not easy to get this person in the tribe to accept the view that the land under his feet is round, because this is too different from what everyone usually sees.

However, such a thing is not difficult for Han Cheng, who made him a person from a liberal arts background.

And it was also influenced by the geography teacher at the time, especially the kind that would use materials from anywhere and explain the model.

Looking at everyone's puzzled looks, Han Cheng didn't rush to speak, but unhurriedly found a model of the earth.

That's right, it's the fruit just now.

"Look closely at the surface of this fruit."

Han Cheng held this fruit in his hand and let everyone in the tribe see it.

This fruit is familiar to the people of the tribe, and every single one of them has eaten it, and there is nothing to see.

But despite this, everyone still followed Han Cheng's request and observed carefully.

"What did you find?"

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 they did not see a single flower.

Wu and Shi also found nothing.

"Isn't the surface of this round-looking fruit uneven?"

Han Cheng said to everyone with a smile.

Everyone was reminded by Han Cheng like this, and they immediately realized that this was indeed the case.

But after a while, they became confused again, because they didn't understand what it had to do with the question they asked the Son of God.

"If this one fruit is enlarged vigorously, if it is vigorously expanded, will these small protrusions on the surface of the fruit become like these peaks and hills? Is the texture on the surface of the fruit the same as 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 Cheng smiled and said to everyone in the tribe.

Some people didn't react for a while, but some people understood something.

The stone took his eyes off the round fruit in Han Cheng's hand and landed on the hill behind the courtyard, and at the same time, the mountain that he had seen before came to mind, which was much bigger and taller than the hill.

After looking at it like this for a while, he moved his gaze back to the distant fruit that Han Cheng was holding in his hand, looking at the small bulges on the surface of the fruit, as well as the shallow ravines, his expression gradually became extremely shocked.

Such a tall mountain peak is like these small protrusions on top of this fruit on the earth, how big the earth that the Son of God said!

Looking at the stone's expression, a smile appeared on Han Cheng's face, he knew that this smart guy understood what he was saying.

"The reason why we feel that the land we live on is flat is because the earth we live on is too big, and there are mountains and rivers on the surface, so we don't usually feel the subtle difference.

However, when you get to a place where the field of vision is wide enough and the ground is flat enough, you can realize that the earth is round.

At that time, we saw trees growing in the distance, and 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 popularize science with these people in the tribe.

Once upon a time, Han Cheng had a plan, and when people in the tribe asked how the mountains and rivers came from, they would take out the legend of the Pangu god who opened the world.

When asked about the shape of the earth, it is explained in terms of the round heaven and the place.

Because if you explain it in this way, it is very similar to what everyone sees on a daily basis, and it can make people understand it better.

But today, his thoughts have changed all at once.

Because he realized that if he really did this, the descendants of the Qingque tribe in the future would not know how many detours they would take.

I don't know how many years it will take to know, the sky is endless, and the earth that lives is round.

Compared to such a thing, the incomprehension at this time is not difficult at all.

And when he told it like this, Han Cheng also had a bold idea.

After he released the fact that the earth where he lives is a huge ball, in the future, will anyone of the descendants of the Qingque tribe rise up to the idea that the world is so big that I want to see it?

Then he sailed with the fleet and began the feat of circumnavigating the world, and by the way, he made a great geographical discovery.

Then began the era when the descendants of the Qingque tribe spread all over the world, and brought back all these things such as peppers, sweet potatoes, corn, potatoes and so on from the Americas, and by the way, made Mandarin the only official language......

Just thinking about this thing makes people feel very excited.

"Actually, the earth is not just a ball, it is always rotating."

Han Cheng talked about the rise today, so he didn't even peel the rabbit, and together with Wu and them, he came to the blue brick and tile house to tell everyone more about astronomy and geography.

Because it's much warmer inside than outside.

At this time, there were more people who came to listen to Han Cheng's story.

Han Cheng thought about it, and asked all the interested people in the tribe to come and listen to the lecture.

It's also time to give the tribe a good science about these aspects.

Knowing these aspects of knowledge can greatly broaden the horizons of the tribe people, and will imperceptibly make people's pattern bigger.

It is not that after a certain degree of development, you will be arrogant and think that you occupy the center of the whole world, and you will begin to be complacent.

After everyone came here, Han Chengcheng 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.

For them, this is even more incomprehensible than the earth in which they live is a sphere.

The earth is always spinning, and I and others have never felt it!

I remember when I didn't grow up, I would get dizzy when I turned there for a while.

Now that the earth of life is always spinning, why don't you feel dizzy?

"This is because the earth only rotates once a day, and it rotates very slowly, so you don't feel dizzy, don't believe you turn slowly on the ground, try to see if your head will be dizzy?"

Han Cheng smiled and said to those people in the tribe who were curious about their brains.

"Why is there day and night? Why does the sun rise in the east and set in the west? ”

After a few people slowly turned around according to what Han Cheng just said, and found that their heads were really not dizzy at all, Han Cheng smiled at everyone and once again threw out such a seemingly simple question, but it was enough to make them lose their hair.

Sure enough, as Han Cheng expected, after these two questions were raised, everyone in the tribe was immediately blinded.

Why is 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 be sensible!

That's how they exist, and why!

Everyone scratched their heads, and even the people who thought they were smart, such as Wu, Yuan, and Shishi, were dumbfounded by this seemingly ordinary question.

Han Cheng couldn't help but smile when he saw this.

These two questions, which at first glance are very common, are actually unsolvable problems before the development of modern science.

The ancient ancestors, faced with this inexplicable problem, began to give full play to their own thinking, and so, the golden crow, Xi driving the sun god chariot and these mythical stories representing mysterious power appeared.

"It's because the Earth is going in circles."

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 puzzlement, they really couldn't understand what the connection between the rotation of the earth and day and night, the sun rising in the east and setting in the west.

Han Cheng knew that everyone was confused, so he smiled and said, "Wait for me to demonstrate it, and you will understand what's going on." ”

Saying that, he asked people to close all the doors and windows of the big brick and tile house, and put down the animal skin curtains that were not very transparent, and the entire blue brick and tile house immediately fell into darkness.

When everyone was curious, there was a fire in front of them, and it was Han Cheng who blew up the fire fold and lit the oil lamp.

After doing this, Han Cheng used his fingernails to make a mark on the fruit.

Then hold the fruit in your hand again.

However, this time it was different from the previous one, and instead of holding it with his hand, he pinched the ends of the fruit with his thumb and index finger and tilted it slightly to make it look like a simple globe.

Then move the oil lamp to the front of you.

"This oil lamp is now equivalent to the sun hanging in the sky, and the fruit in my hand is equivalent to the earth we live in.

The mark I made with my fingernails on the fruit is equivalent to where our tribe is on earth. ”

After Han Cheng got this right, he looked at the people in the tribe and spoke.

In the entire blue brick and tile house, only Han Cheng's voice sounded.

The rest of the people were all attracted by the two questions that Han Cheng had thrown out before, as well as what he was doing now.

They all listened and watched intently.

I want to understand why there is day and night, and why the sun rises in the east and sets in the west.

Han Cheng glanced at everyone and saw that everyone was extremely serious, and he was very satisfied.

"Look, the fruit in my hand is now illuminated only by the side facing the light, and the other side is not illuminated by the light.

The side that is illuminated is the day, and the one that is not illuminated is the night. ”

Thinking about the scenes that everyone saw on weekdays when there was sun during the day and no sunlight at night, and then compared it with what Han Cheng said and did now, it was easy to understand the difference between day and night.

"Everyone is optimistic, now the earth is starting to turn, and at this moment, this point representing our Qingque tribe is being illuminated by the light, so it is daytime......"

Han Cheng said, and began to slowly turn the fruit in his hand with his other hand, from west to east.

As Han Cheng turned, the imprint that was originally illuminated by the light that represented the location of the Qingque tribe slowly moved to a place where the light could not shine.

"Look, now the light is gone, and darkness is coming."

Han Cheng said this, paused for a while, and waited until everyone saw it clearly, and then continued to turn the fruit in his hand.

It's still from west to east.

In a few moments, the mark on the fruit reappeared from the darkness back into the light, illuminated by the light.

"Now, the earth has come full circle, and the sky is 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, thinking back to the magical scene that Shenzi showed them through this fruit just now.

Someone showed a look of surprise and thought, as if there was something incomparably mysterious, slowly opening up in front of their eyes, and the whole world suddenly became open.

Some people look at these and are full of curiosity, thinking that this is something that has never been seen before, and that the rhetoric is very novel.

There are also people who are scratching their heads with their hands.

These things in front of them, obviously Miko has already explained very clearly, and they all looked at it, but they just couldn't understand what it meant.

What earth turns, what day turns into night, how can the little dots on the fruit become their own tribe?

But although I can't understand it, it still looks very advanced and very reasonable.

Everyone reacted and Han Cheng also saw it, and so did those who scratched their heads.

However, Han Cheng did not feel any frustration because of this.

This is not something that everyone needs to understand, only some people need to know.

Moreover, this is only the first time he has spoken about these things in the tribe, and it is understandable that many people in the tribe have difficulty understanding it.

Because even in later generations, many liberal arts students still have a headache about geography, especially when it comes to the morning and dusk line, calculating latitude and longitude, etc., and they can't wait to get their heads bald.

At this time, it is normal for some people not to understand.

Even, looking at the few people who showed a look of surprise or enlightenment, Han Cheng felt very surprised.

I have found some talents in the tribe again!

After Han Cheng paused for a while, he continued to repeat the action just now, and explained the relationship between the rotation of the earth and day and night as much as possible, so that more people could understand.

After a while, Han Cheng began to ask: "Many people have already understood how day and night come about, and now I want to ask, do anyone know why the sun rises in the east and sets in the west?" ”

After finishing speaking, they looked at everyone, and everyone stared at each other, and they couldn't understand what was going on.

The stone and others who figured out what was going on during the day and night had some vague ideas, but they just couldn't grasp them.

Seeing this, Han Cheng was not in a hurry, but said, "Let's take a good look at the movement of the earth." ”

As he spoke, he continued to use his hand and began to slowly rotate the fruit that was a little sloping in his hand.

As he turned, the mark on the fruit, which represented the Blue Sparrow tribe, was illuminated by the light for a while, and then hidden into darkness.

"Miko! I know! ”

Watching the stone of Han Cheng's movements intently, his eyes became brighter and brighter, and after a while, he finally shouted in surprise and raised his right hand high at the same time.

"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 turns from west to east!"

After getting Han Cheng's permission, Shi suddenly stood up from his seat and said excitedly, especially like the minors he taught before.

Han Cheng cast an approving glance at the stone, and the stone's words were to the point.

"Let's talk about it, let's see if I can go into more detail."

After Han Cheng recognized the answer that Shi had just given, he looked at him and said with encouragement.

"This ......"

Stone didn't know what to say for a while.

Han Cheng turned the fruit in his hand as a globe at the right time.

"Yes, because when you turn from west to east, the easternmost part of a place is first touched by the sun, and when the sunlight disappears last, it disappears from the west side of that place......

The stone thought for a moment, then spoke again, with some uncertainty.

"Awesome!"

After the stone's words fell, Han Cheng put the fruit in his hand on the table and gave a double thumbs up to the stone, giving the highest praise to the stone's words.

Even if Han Cheng made a hint, but being able to say such a thing, the stone is also worthy of Han Cheng's praise!

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