Everyone didn't speak, Tianming had his own answer, and hurriedly said: "I think the sun is close to people when it just rises, and far away from people at noon." ”

Hearing Tianming's words, some people think it makes sense, but they feel that it is unreasonable, so do you know how to refute it?

Gai Nie thought about it, as a participant, he naturally had to do his best to think about it, and finally had a good idea.

"I think when the sun first comes out, it's as big as the lid of a car, and at noon it's as small as a plate. Gagnie's point of view is what it is, and intuitively, that's what happened.

Zhang Liang felt that both sides made sense, he really didn't know how to go back now, how could Fusu feel a little bit like two children arguing about the day, and now it has become five people.

"When the sun first comes out, it's cool, and at noon it's as hot as putting your hand in hot water, isn't this the reason why you feel hot when you're close and cold when you're far away?" Tianming retorted again.

Xun Jing and Zhang Liang didn't understand either, they only knew that both sides were reasonable, and it was difficult to explain for a while, and they couldn't explain many things clearly, but they just thought it was amazing.

In the end, the four did not speak, and neither party's point of view could convince the other, in fact, including themselves, sometimes they felt that the other party was right, which was really a problem for the ages.

They knew that since Fusu had brought up this topic, they naturally understood the reason, and cast strange eyes to get Fusu's explanation.

Fusu watched several people staring at him, and hurriedly smiled and said, "Actually, it's as far away." ”

"Just as far?" Tianming couldn't understand it, obviously a little unexpected.

Don't say Tianming, but the other three people think it's incredible, but Fusu can't offend anyone, so he took a middle one, that is, the same far, the same close.

Fusu nodded and continued: "This is the limitation of our human vision, for example, there is a light in the pavilion, now light it, you walk a hundred steps to see, can you see it glowing now?" ”

It's daytime, so the light of the candle can't compare to the sun's rays at all, so the light of the candle can't be seen at all.

Several people hurriedly shook their heads, compared to a hundred steps, even fifty steps could not be seen, and they also followed Fusu's train of thought and imagined together.

"In the same way, if you light a candle at night, and you stand a hundred paces away and look at it, then you will see the light of the candle." Fusu felt that he had already said it well, and if they didn't understand it, it would be useless to be able to tell them, and they were very confused about many things.

"I still don't understand." Tianming felt that he couldn't understand it, because the conditions were different, one was at night and the other was during the day, which was difficult to understand.

Fusu said: "Then we all light a candle at night, stand at a distance of fifty steps, today it is foggy, tomorrow it will not be foggy, naturally it will be brighter without fog, but the distance is still the same." ”

When Fusu said this, everyone understood, which meant that in the morning, due to the fog, everyone felt that the sun was a little big and not hot, and if there was no fog, it felt close and hot.

Fusu didn't care if they understood it or not, anyway, he understood it very well, and wanted to explain the problem to them clearly, but he was afraid that he couldn't explain it clearly for three days and three nights.

"The world we live in is called the earth, and the ball is naturally round, so why there is day and night, which is also very easy to explain." How did Fusu feel that the more he spoke, some of them were like divine sticks, spreading some other ideas to them.

"Think of a lit candle as the sun, and a random ball as our place to live, where there is an autobiography and revolution between two objects, and when it gets dark, it's because the other side of the ball blocks the light, and the side without light is night, and the side with light is day."

In order to be more vivid, Fusu also found something to use as a metaphor, which is more vivid and easier for them to understand.

In this way, Fusu believed that they had not learned anything about geography and that they could understand the explanations of day and night.

Several people are smart people, and there are many things they haven't heard of, but Fusu's analogy just now is easy to understand, but new problems have arisen.

Xun said: "You said that the ground is round, so why didn't we stand upside down?"

Fusu said: "This involves another problem, that is, the gravitational pull of the earth, so we can't jump high, things always fall down, this thing sounds a little abstract, and it doesn't make sense to say too much, and when you have a chance in the future, I'll show you what has been called a video, and you will understand the earth." ”

Fusu planned to stop there, but he couldn't stop talking about it, and instantly became a teacher, but they were all zero-based people, and it would be his life to talk about it.

A few people suddenly woke up, there are many things they really don't know, Fusu has to explain to them for a long time, but they have a new understanding of many things.

It turned out that the earth we lived in was round, and day and night were relative, and they could be very sure that Fusu knew a lot, and felt that he was a god, omniscient, omniscient.

Fusu felt that he had told them so many nonsense things today, and he wanted to say that if he didn't obey, he would be killed, but he felt that it was not good to kill almost intellectuals.

I want them to see what science and technology are, a great person is about to be born, compared to dominating the world, what Fusu said is great.

Fusu got up and said with a smile: "It's been so long since I came out today, we still have to rush back tonight, if you have any doubts, you can go to Baiyun Mountain in Shangjun to find me, then you won't think I'm joking, like a missionary, a bit like a magic stick." ”

Xun said: "How come? Like you said, there are a lot of things that we don't know and don't mean they don't exist, so I believe what you say very much. ”

Several people also nodded, Fusu's words sounded a bit magical, but they were reasonable, and it was difficult for them to refute.

"In that case, then I would like to welcome a few of you to Shangjun." Fusu is ready to say goodbye to a few people, it seems that today's things have been almost done, but I don't know what they think in their hearts?

Xun Guo said: "It's rare for you to come once, it's better to stay here and rest for a few days, besides, this place is far away from Shangjun, and you won't be able to get there for a while." ”

Fusu smiled and said: "Thank you, but we should be able to arrive today, so we won't stay too long, the world is so big, you should go out and have a look, everyone is leaving!" ”

Several people hurriedly said: "Take care all the way." ”

Seeing Fusu leave, several people had mixed feelings in their hearts, and Zhang Liang spoke: "This place is so far away from Shangjun, can they really rush to Shangjun today?" ”

Zhang Liang first questioned, and then Gai Nie, who felt incredible, and said suspiciously: "Is it possible that the two of them are so powerful in martial arts, they can fly in the air and shrink into inches." ”

Xun Guan smiled and said, "You might as well say that they are immortals." ”

A few people smiled, isn't that it?

Tianming thought for a while, seemed to think of something, and said, "It's really possible that they will arrive in Shangjun today." ”

Tianming had been to Shangjun and knew that there was an animal called Icaran Pterodactyl, which was so big and extremely fast, and it seemed that Fusu should use it.