Hundreds of schools follow

Chapter 24
"Oh?!" Fan Ya was startled, "Could it be... this is your idea?"

"It's not me, it's Tanying. Why is the shadow shifting to the north? That's Tanying's first question."

"Tanying? Who is Tanying, is she here?"

While the audience was searching, Huang Er wiped off his sweat, and cupped his hands first: "Si Ye, the student has already explained this. I realized this when I was chatting with my friend. The friend is Ying Yue and his companion Tan Ying."

But he heard a deafening roar.

"Put your mother's shit!!!"

Ying Yue became angry for breaking the case, pointing at Huang Er's throat and cursing:
"Dog thief!! How dare An hang himself across the street like this?!

"Talking with you? What are you talking about? Seeing you bragging?

"Eavesdropping is eavesdropping! I guarantee everything I have, Huang Er is eavesdropping!

"The more talented you are, the less talented you are, the less talented you are. Your Chunshen family is only capable of this?!"

As soon as this scolding came out, the audience was immersed in silence.

But my mind was full of pleasant echoes.

A bachelor who can swear such cruel words must not be too talented...

Here, it's too late for Tanying to pull, and he has no choice but to cover his head.

Indeed, now is the time to stand up and fight back.

But in front of so many scholars, shit, shit, and ass are all the way up, so out of control...

Brother, you are afraid to...

"Good scolding!! Good!!" But Pang Mu got up and praised angrily, "Report your grievances directly, and get angry when you are angry. This is a real gentleman! This is a real man! I said it!"

Actually it's not just him.

Other scholars also felt inexplicably sour when they heard it.

Maybe it's because it's too high-sounding for too long.

Hearing Ying Yue's extremely crude cursing in the street, even the meridians became much smoother.

Unexpectedly, my Daqin's cursing skills are so perfect...

On the other side, Si Qinghuang also said excitedly: "The problem of shadows was also the first thing that Tanying figured out, but he only thought about it for himself and didn't want to share it with others. Students really don't believe that such a humble person cherishes his loyalty." He will tell Huang Er generously."

Huang'er was already sweating profusely at this time, but he still looked sideways and argued: "You leave first during the clear talk, how will you know what's going on later?"

Bang!
Ying Yue was furious and pointed at the case: "You dog thief! Still not shrinking eggs?!"

"You...you're crazy...I won't argue with you..." Huang Er didn't dare to look at him at all, and just hand in hand with Fan Ya, "Si Ye will clearly see the twists and turns."

"No need." Fan Ya only shook his head lightly, "I can only learn from my talents in this matter."

After saying that, he turned to the handsome man behind Ying Yue who couldn't hide it.

Tan Ying hurriedly stood up and saluted: "Student Tan Ying, I have met all the teachers."

In fact, he didn't need to say much at all, everyone at the scene had peeked at his appearance countless times.

But seeing Tanying stand up gracefully at this time, seeing this nearly eight feet tall horse-like figure, the scholars still couldn't help exclaiming.

Even Fan Ya was a little startled.

Heavenly Dao... Such a great Heavenly Dao... can create such a beautiful masterpiece.

But he still held back his airs, and only asked slowly: "If Huang Er really stole your theory, why didn't you point it out just now?"

"The teacher didn't say that you can speak freely, so the students only dare to listen respectfully." Tan Ying replied respectfully.

"Aren't you afraid that Huang Er will steal your things?" Fan Ya asked.

"There is no new theory under the Dao of Heaven. The talk of students being eavesdropped by Huang Er is only realized by the sages. Therefore, what Huang Er stole is not the students, but the sages." Tanying replied calmly, "Furthermore, the students believe that The teacher has his own discernment."

"Scholar Tan, if you speak too modestly, it will sound exaggerated. Rather than crafting beautiful sentences here, it is better to express your ambitions and show others." Fan Ya seemed dissatisfied with Tan Ying's answer. , only frowned and said, "And my way of distinguishing right from wrong is to ask you the question I asked Huang Er before, how about it?"

"Please, teacher."

Fan Ya immediately became silent.

This is the beginning of a clear talk within a clear talk.

Fan Ya: "Why does day and night change?"

Tan Ying: "In addition to the earth's revolution around the sun, there is a spin like a top. Therefore, every place on the sphere will be bathed in sunlight in turn. The direction of rotation is from west to east, and one revolution is a day."

Fan Ya paused.

The whole audience was also lost in thought.

It is normal for students to be unable to figure out this model for a while, but the teachers already have the foundation just now, so it is not difficult to figure it out.

It is difficult to have conclusive evidence for astronomical theories, so it has always been self-consistent.

Using spin to solve the change of day and night, although it is difficult to accept intuitively, it can be considered as a reasonable solution.

At least Tan Ying had really considered this matter, while Huang Er hadn't.

While Zhu Xuebo nodded, Fan Ya spoke again.

Fan Ya: "How do you know it's from west to east?"

Tan Ying: "The sun rises in the east and sets in the west."

Fan Ya: "Why can't I feel the spin?"

Tan Ying: "A baby is born in a carriage that travels at a constant speed forever, and spends his whole life in the carriage. Can he still feel the carriage moving?"

Fan Ya: "He can look out of the car and know that the car is moving."

Tan Ying: "Then the teacher can also look up at the stars, and you will know that the earth is spinning after watching for a long time."

Fan Ya: "...um, very good...can I continue to ask questions?"

Tan Ying: "Teacher, please."

Fan Ya: "Why does the spin come about?"

Tan Ying: "It can only be said that it has existed since the beginning, and the depth of the students has only reached this point."

Fan Ya: "That's enough. Next question, why are there four seasons?"

Tanying: "Because the ecliptic and the equator do not coincide, there is an angle."

Fan Ya: "You might as well explain it in detail."

Tan Ying: "The ecliptic, that is, from the perspective of the earth, the track that the sun travels in a year is also the orbital plane of the earth's revolution around the sun.

"The equator, that is, the orbital plane with the longest circumference in the earth's rotation, is also the dividing plane between the northern and southern hemispheres.

"These two sides do not overlap, there must be an angle, otherwise the sun will always shine directly on the equator, and all places will have the same light all year round, so there will be no four seasons.

"Evolving it into a graphic means that when the earth is traveling around the sun, it is spinning crookedly, like a spinning top that is always about to fall to the ground.

"With this graph as an illustration, it is not difficult to imagine that as the earth's revolution and the position of the sun change, the point directly hitting the earth will also change back and forth near the equator, and the light received by various places will also change back and forth.

"The day with the most light and the longest day is the summer solstice, and the day with the least light and the shortest day is the winter solstice.

"This is the cause of the change of seasons, the cause of fantasy, but the only cause that students can think of."

After the Tanying was released, the sound stopped abruptly.

The audience was in reverie, speechless for a long time.

Equator, ecliptic, circumference.

trajectory, position, geometry.

It takes too much knowledge and imagination to understand what Tanying said.

Not to mention the students present, even the scholars, there are very few people who can construct a picture in a moment.

They even felt that Tan Ying was bluffing, deliberately using some complicated descriptions to cover up the flaws in the theory.

Until Fan Ya's eyes widened suddenly, and he raised his arms and called out:
"I see!
"When I was young, a South Vietnamese person told me that their shadows were sometimes northerly, sometimes southerly, and sometimes there was no shadow at noon. I have been thinking hard and still can't understand this.

"But he used the head as a guarantee, wishing he could hit the wall to show his will.

"I see!!

"Ha ha ha ha ha ha ha!!
"He didn't lie to me, it really can be like this!
"Hahahahaha! Wonderful!"

Fan Ya was laughing wildly, and couldn't stop laughing wildly.

The white beard, which looks like a weeping willow on a cliff, dances like a gust of wind.

At this time, he didn't even look like he was in charge of the industry. He was basically a crazy kid who had been holding back for ten years before he could get his revenge.

The others were even more dazed.

I haven't figured out the principle of the four seasons here, so why did I go back to the shadow?

Sometimes northerly, sometimes southerly, sometimes no shadow at noon?What kind of hell on earth is this?
But even if they still can't understand, Fan Ya's carefree feeling like getting revenge for a big revenge can't be deceived.

More importantly, he is Fan Ya, Fan Zi, the venerable Mohist in the Qin Dynasty, and the number one in mathematics and science in the world.

Such a person has a problem that has plagued him all his life.

Just at that moment, it was solved.

And the person who solved him...

Zhu Xuebo couldn't help but look at Tanying in surprise.

Their feelings at this moment are just like those when Xue Wang first saw Guang Wu——

Although the reason is unknown, it was greatly shocked.

Even Han Sun, unconsciously lost his laziness and desolation, and focused his wandering gaze on this.

But Tan Ying was so solemn that she didn't notice this at all.

Because of Fan Ya, she has realized the existence of the Tropic of Cancer by herself.

Previously, for the sake of brevity, Tan Ying told Ying Yue that the shadow in the northern hemisphere was more northerly, and the southern hemisphere was more southerly. Of course, this was inappropriate. Fan Ya naturally found a loophole and refuted Huang'er.

The correct statement about the shadow is: except for the north and south poles, the shadow is always north of the Tropic of Cancer, and the shadow is always south of the Tropic of Capricornus.

As for the difference between the two, because the earth is "rotating obliquely", the point where the sun directly hits the earth will reciprocate within this range.

Therefore, the sun is sometimes southerly, sometimes northerly, and sometimes it is in the sky.

During this reciprocation, whenever the sun shines directly on the Tropic of Cancer, it is the winter solstice and summer solstice.

Whenever the point of direct sunlight crosses the equator, it is an equinox.

Undoubtedly, the latitude of these two tropics is also the angle at which the earth is tilted, and it can only be the angle between the ecliptic and the equator——

23°26'.

what……

Thinking so far, Tan Ying seems like a lifetime away.

came back.

The geography knowledge that was buried deep in the memory, under the mundane trifles, all came back.

Why is the shadow to the north?

It was just such a simple question at first.

Before I knew it, I had come so far...

　This chapter was reviewed because Brother Yue spoke so nicely, I got out of bed, changed it and reposted it...

　　
　
(End of this chapter)