"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 be 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?

然后带着船队远航，开启环球航行的壮举，并顺带着有了地理大发现。

而后开始青雀部落子孙遍布全球的时代，并把美洲的辣椒、红薯、玉米、土豆等这些东西，统统的都给带回来，顺带着让普通话成为唯一官方语言……

这事情，只要想想就让人觉得特别刺激。

“其实地球还不仅仅是一个圆球，它还一直都在转动着。”

韩成今天讲的兴起，所以就连兔子也不剥了，和巫他们一起，来到了青砖大瓦房之内，对众人讲述更多关于天文地理的知识。

因为这屋子里面要比外面暖和的太多。

这时候，过来听韩成讲述东西的人更多了。

韩成想了想，就让部落里的有兴趣的人，都过来听讲。

也是时候，给部落里众人好好的科普一下这些方面的知识了。

知道这些方面的知识，能够让极大的开阔部落众人的视野，会在潜移默化之间，让人的格局变大。

不会在发展的一定的程度之后，就会自大的以为，自己占据了整个世界的中心处，并开始故步自封。

众人来到这里之后，韩成就开始给部落里的众人，讲诉地球的自转。

这样的话出口之后，部落里的人更加的惊讶了。

对于他们来说，这简直比生活的大地是一个圆球，更加的令人难以理解。

地球一直都在转圈，自己等人从来都没有感受到过啊！

记得还没有长大的时候，自己在那里转上一会儿，头就会晕。

现在生活的大地一直都在转圈，那自己怎么没有感觉到头晕呢？

“这是因为地球一天就只转一圈，转的很慢，所以感受不到头晕，不信你在地上缓缓的转上一圈，试试看头还会不会晕？”

韩成笑着对部落里为自己脑壳不晕而好奇的那些人说道。

“为什么会有白天和黑夜？为什么太阳会从东面升起，在西面落下？”

在几个人按照韩成刚才说的，慢慢的转了一圈，发现头果然一点都不晕之后，韩成笑眯眯的对着众人，再次抛出这样看似简单，却足以令他们掉头发的问题。

果然不出韩成所料，这两个问题抛出之后，部落里的众人，立刻就抓瞎了。

为什么会有白天和黑夜？为什么太阳会从东面升起，从西方落下？

这……

这些事情从他们开始懂事的时候就是这样的啊！

它们就是这样存在，哪有为什么！

众人纷纷挠头，就连自认为聪明的巫、圆、石头这些人，都被这看似寻常的问题给问的哑口无言。

韩成见此不由笑笑。

这两个猛地一看，非常寻常的问题，实际上在近现代科学没有发展起来之前，是一个无解的难题。

古代的先民们，面对这种解释不了的问题，就开始充分发挥自己的想想，于是，金乌、驾着太阳神车的羲和这些代表着神秘力量的神话故事，就此出现。

“这是因为地球在转圈的缘故。”

等了一会儿之后，韩成开始给众人解说原因。

在韩成说出这个答案之后，部落里的众人全都是满脑子的不解，他们实在是想不明白，地球的转圈和白天黑夜、太阳东升西落有什么联系。

韩成知道众人疑惑，便笑道：“等我演示一下你们就会明白怎么回事了。”

说着让人将青砖大瓦房所有的门窗都给关上，并将不怎么透光的兽皮帘子放下，整个青砖大瓦房里，立刻就陷入了黑暗之中。

在众人好奇不已的时候，有火光在前面亮起，这是韩成吹亮了火折子，点燃了油灯。

做好这些之后，韩成用指甲，在那颗果子上扣出来了一个印记。

然后再次将这颗果子拿在手中。

不过这次和之前不一样，没有用手托着，而是将拇指食指捏着果子的两端，稍微倾斜，做简易地球仪的样子。

而后将油灯转移到身前。

“这油灯此时就相当于天上挂着的太阳，我手里的这颗果子，就相当于我们居住的地球。

果子上面，我用指甲扣出来的印记，就相当于我们部落在地球上所在的位置。”

韩成将这弄好之后，看着部落里的众人开口说道。

整个青砖大瓦房之内，只有韩成一个人的声音响起。

其余的人全都被韩成之前抛出来的两个问题，以及现在正在做的事情，给吸引了全部的心神。

都是聚精会神的听着、看着。

想要从神子这里，明白为什么会有白天和黑夜，为什么太阳会东升西落。

韩成看了一眼众人，见众人都异常的认真，心里很是满意。

当即便继续道：“看，现在我手里的这个果子，只有面对着灯光的着一面被照亮了，另外一面则是没有被灯光照到。

被照到的这一面，就是白天，没有被照到的，就是黑夜。”

众人想想平日里所见到白天有阳，而晚上没有阳光的情景，再和韩成现在所说所做的做了一个对比，很容易就能理解白天和黑夜的区别。

“大家看好，现在地球开始转动了，此刻，代表着我们青雀部落的这儿点，正被光照射着，所以是白天……”

韩成说着，开始用另外一只手慢慢的转动手中的果子，自西往东。

随着韩成的转动，原本被灯光照亮的那个代表着青雀部落位置的印记，慢慢的转移到了灯光照不到的地方。

“看，现在光照不到了，黑暗就降临了。”

韩成这样说着，停顿了一会儿，等到众人都看清楚之后，才继续转动手里的果子。

依然是自西往东转。

没一会儿，果子上面的印记，就从黑暗之中，重现回到了光明里，被灯光照亮。

“现在，地球转了一圈，天重新变亮了。”

韩成再次停下手中动作，看着部落里的众人，笑着说道。

众人全都一眨不眨的看着韩成手中那个被灯光照亮的果子，回想着刚才的时候，神子通过这个果子向他们所展现出来的神奇一幕。

有人露出惊喜与思索之色，似乎有什么无比奥妙的东西，在眼前缓缓打开，整个世界一下子变得开阔起来。

有人看着这些，满是好奇，觉得这从未见过的事情，以及说辞非常新奇。

还有一些人，在用手挠着脑袋。

眼前的这些东西，明明神子已经讲述的非常清楚，他们也都看了一边，但就是不能理解是什么意思。

什么地球转动，什么白天变到黑夜了，那果子上的小点，怎么就变成自己部落了呢？

不过虽然理解不了，但是看起来还是非常高深，非常有道理的样子。

众人反应韩成也都看在眼里，那些挠头的人也一样。

不过韩成并没有因此而感到什么沮丧。

这事情也不是需要每一个人都懂，只需要一部分人知道就行了。

并且，这还只是他第一次在部落里讲这些东西，部落里的不少人理解起来吃力也在情理之中。

因为就算是在后世，不少文科生对于地理还是很头疼的，尤其是涉及到晨昏线、推算经纬度之类的时候，恨不得把头撸秃了。

这时候有人不理解，实在是再正常不过了。

甚至于，看着那几个露出恍然或者是明悟之色的人，韩成还觉得非常惊喜。

自己这是又在部落了发现了一些人才！

韩成停顿了一会儿之后，继续重复着刚才的动作，并尽可能的将地球的自转与白天和黑夜的关系，讲述的更加明白，让更多人了解。

这样过了一阵儿之后，韩成开始提问：“白天和黑夜是怎么产生的，不少人都已经明白了，现在我想要问问，有人知不知道太阳为什么从东边升起，自西边落下？”

说完之后看着众人，众人皆是大眼瞪小眼，闹不明白是怎么回事。

石头以及另外一些弄明白了白天、黑夜怎么回事的人，隐隐约约的倒是有一些什么想法，但就是抓不住。

韩成见此并不着急，而是道：“再好好看看地球的运动。”

说着继续用手开始慢慢的转动着手里有些倾斜的果子。

随着他的转动，果子之上，那个代表着青雀部落的印记，一会儿被灯光照亮，一会儿又隐入黑暗之中。

“神子！我知道了！”

聚精会神的看着韩成动作的石头，眼睛越来越亮，过了一阵儿之后，终于惊喜的喊叫出声，同时将右手高高的举起。

“那你说说是因为什么。”

韩成停下手中的动作，看着石头笑着说道。

“是因为地球是从西往东面转动的！”

石头得到韩成的允许之后，一下子从座位了站了起来，满是激动的说着，特别像之前的时候，他教授的那些未成年人们。

韩成对着石头投去了赞许的目光，石头的这一句话正说到点子上。

“再说说看，看还能不能再说的更详细一点。”

韩成认可了石头刚才的答案之后，看着他满是鼓励的说道。

“这个……”

石头一时间有些不知道该怎么说。

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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