Jiang Xinghuo didn't dwell too long on this issue, which could not be confirmed at the moment, but continued.

"But what I want to say is that if it is only used to observe the five celestial bodies of the sun, the moon, and the five celestial bodies of gold, wood, water, fire, and earth, then the heliocentric theory must be more accurate than the geocentric theory."

"How?" Zheng He asked curiously.

In the Ming Dynasty, astronomy is such a thing, as long as you can circle it to the heaven and man induction, and do not pose a threat to the legal rationality of the imperial power, then it doesn't matter if you are geocentric or heliocentric, armillary or covered, whatever you say.

"At most" was beaten by the government with a hundred boards.

This was much better than in the West at the same time, and of course, Bruno was burned at the stake not only because he spread heliocentrism, but also because he spread some kind of sun-worship in ancient Egypt through heliocentrism

Speaking of the present, Jiang Xinghuo said: "For example, the simplest example is also a question that the successive generations of Qin Tianjian in China have been avoiding. ”

Jiang Xinghuo coughed lightly and raised a soul question.

"The five celestial bodies of gold, wood, water, fire, and earth sometimes go retrograde, how to explain it?"

"In particular, Mars retrograde, also known as glow retrograde, is the most common and cannot be concealed at all. The most common observation of Mars' trajectory is west-to-east, but every two years or so, it is observed to move from east to west for a while, then turn back again after a few days, and return to west-to-east. ”

Zhuo Jing was silent for a while, this kind of unsolved mystery has indeed been unclear all the time.

Therefore, since the explanation is not clear, the Qin Tianjian of the past dynasties also chose not to explain.

Anyway, the explanation of astronomical phenomena is not clear, so you can rely on the human world.

Occasionally, the celestial bodies are retrograde, so they should take two steps back when they are tired of walking forward, and it will not affect anything else.

Seeing that Old Man Zhuo didn't speak, Jiang Xinghuo said: "This is the disadvantage of the geocentric theory, so if we take the sun as the center, the earth, the moon, and the five celestial bodies of gold, wood, water, fire, and earth all revolve around the sun, and the retrograde phenomenon of celestial bodies similar to the retrograde of the fluorescent confusion is very easy to explain." ”

"How do you explain it?" Zheng He asked curiously.

"Because both the Earth and Mars are moving, and the speed and position of the movement are different, there will be retrograde movements of celestial bodies when the Earth is used as the observation point, that is, caused by changes in relative velocity." Jiang Xinghuo explained.

Old man Zhuo wrinkled his eyebrows and said, "It's not right! ”

Jiang Xinghuo didn't say anything, and continued to take a small branch on the ground to paint.

Jiang Xinghuo wiped off the original ○, leaving the middle pattern, and then drew a circle of elliptical patterns around the project, representing the celestial bodies such as gold, wood, water, fire, earth, etc., and with the earth as the center, he drew the trajectory of the moon.

"Is it right now?"

Zhuo Jing twisted his beard and pondered deeply.

"Right?"

"That's not right!"

"Isn't that right?"

"Yes!"

Zhuo Jing finally shook his head and said, "No. This sun-centric trajectory is perfectly drawn, but there are two problems that cannot be explained. ”

"Which two? Let's hear it. ”

Zhuo Jing drew a △ pattern on the ground, and drew a 丨 pattern in the middle of this pattern.

"Little friend, that's how the ranging is measured, right?"

Zheng He replied first: "That's how it was measured." ”

Seeing that Zhu Gaoxu was confused, Jiang Xinghuo explained to the eldest disciple: "This is the easiest way to measure the distance of celestial bodies, and it is to use the so-called [trigonometric parallax method], which is a method often used to measure the earth, and this is how Guo Shoujing measures the length of the earth. ”

Zhu Gaoxu nodded as if he didn't understand, but he still didn't understand how a triangle and a vertical line could measure the distance.

"The principle is that if we can't measure the distance between a distant object, such as a vertex on a triangle, we can take this approach, that is, draw a baseline, and then measure the position of the object at each end of the baseline, so that we can get the angle of the object to the baseline."

After speaking, Jiang Xinghuo made a gesture with the bending of the tiger's mouth, and Zhu Gaoxu understood what it meant.

"As long as we get the angle of the object to the baseline, and then measure the length of the baseline in the triangle, we can use the [trigonometric parallax method] to get the distance between the distant object and us, that is, the 'baseline length' divided by the 'angle of the object to the baseline'."

Seeing that Zhu Gaoxu still didn't understand.

Jiang Xinghuo did not show the slightest discouragement.

For the wise, there is the teachings of the wise.

There is a teaching for those who can be wise for the second time, and for those who are wise for the second time.

In this world, there are no stupid people, only suitable teaching methods.

Therefore, Jiang Xinghuo used the simplest example to help Zhu Gaoxu understand.

"Stretch out your right arm and raise your right thumb with your fingernails facing you."

Then, Jiang Xinghuo placed his twig behind Zhu Gaoxu's right thumb as a reference.

Zhu Gaoxu did as he said.

"Close your left eye, open your right eye, and look at your right thumb."

Seeing Zhu Gaoxu close his eyes, Jiang Xinghuo said again.

"Remember this position, then open your left eye, close your right eye, and look at your right thumb."

"Huh?"

Zhu Gaoxu let out a puzzled voice in surprise.

"Mr. Jiang, how did I move the position of my right thumb and branch? I didn't move, and Mr. Jiang's branches didn't move! ”

Jiang Xinghuo put down the branch and said simply: "This is due to the change in the length of the baseline, the relative distance from the object, that is to say, your left eye and your right eye have formed different baselines due to the different angles of observation, do you understand the principle of this?" ”

As soon as he said this, Zhu Gaoxu suddenly realized.

Zhu Gaoxu, who had a lot of brains, even thought further: "Then what I want to ask is that if the sun is the center, if the earth is in a different observation position, the sun should also change?" This principle is the same as the position of the left and right eyes looking at the thumb! ”

"yes, that's what I wanted to ask."

Zhuo Jinghu glanced at Zhu Gaoxu suspiciously, only to hear that this person is brave and extraordinary, but his temperament is reckless and lacks wisdom, how does this seem that although he is not a top smart person, he is not stupid at all!

"If the sun is the center, why do we look at the sun from different positions throughout the year and the sun does not change at all? If parallax is fine, then the sun should change. ”

"Hahahaha!!"

Jiang Xinghuo laughed extremely happily, and when the laughter subsided, he picked up a small pebble from the ground.

The pebble was pinched by two fingers in Jiang Xinghuo's hand, and it crossed the trajectory in the air in a circle.

"Do you think that if the sun were the center, the earth should move around the sun so stationary on its own?"

Zhuo Jing nodded as a matter of course.

If the earth itself is moving, then don't they all fall from the ground?

So the earth can move around the sun, but it certainly can't move itself.

Jiang Xinghuo didn't say anything, but kept rubbing the small stone between his thumb and index finger, and turned in circles while rubbing the small stone.

"How is it impossible for the earth itself to move? If the earth is also moving, then do you think that the solar parallax is not a problem? ”

"Impossible!"

"No way!"

This time, not only Zhuo Jing, but Zheng He also opposed it in unison.

"Mr. Jiang, if you explain it this way, then this is equivalent to creating a bigger problem in order to solve a problem! If the earth itself moves, won't we all fall? Zheng He said.

"And."

Zhuo Jing asked, "When we throw a stone into the sky, if the earth is moving, then the stone we throw will fall behind, won't it?" ”

Zhu Gaoxu nodded, it sounded very reasonable, and the reasoning process was simply impeccable.

Zhuo Jing also picked up a small stone from the ground and threw it lightly, but the small stone fell on the spot.

"How do you explain it?"

Zhuo Jing looked at Jiang Xinghuo proudly.

If Jiang Xinghuo proposed that the earth itself is also moving in order to forcibly explain the parallax of the sun, then the problem that the stone did not fall behind cannot be explained.

And if we can't explain why the stone fell behind, the so-called heliocentric theory will naturally be self-defeating.

Zheng He also quickly realized the logic of one link after another.

Heliocentrism says - the sun is parallax - the earth moves.

Jiang Xinghuo didn't explain, but stood up and kicked the new crooked neck tree.

It is now the beginning of November, and the leaves that have been withered and scattered to the point that there are not many left, suddenly "fluttered" down.

"Got it?"

The three of them were confused.

Got it?

"Why do the leaves fall and not go up?" Jiang Xinghuo asked.

"Because the leaves are supposed to go down."

Jiang Xinghuo interrupted unceremoniously: "Is it really supposed to be?" How did this come about? ”

"Smack!"

Zhuo Jing's twisted beard was suddenly torn off by himself.

An extremely complicated look appeared in his eyes.

"Little friend is, do you mean, there is some kind of power sucking on the ground?"

"Or else?" Jiang Xinghuo asked rhetorically, "Did the Mongolian man-made return cannon throw stones high and far?" Then why don't you see the Mongols throwing stones into the sky and not coming back? ”

Silent.

The crow "quacked" over its head.

Or silence.

Jiang Xinghuo's astonishing self-justification method greatly impacted Old Man Zhuo's worldview.

Zhuo Jing's heart began to question and think about himself.

Could it be that the Hun Tian theory, which has lasted for thousands of years since the Eastern Han Dynasty, is partially wrong? ’

'The earth is indeed round, Guo Shoujing measured it, there is no doubt about it. ’

But our earth is not the center of the universe, but the sun is the center of the universe at present. ’

'The parallax of the sun does not exist because the earth is also rotating in sync. ’

'Turning the stone synchronously does not fall behind, because there is an invisible force that emanates from the ground, dragging everything in this world from being thrown out. ’

But how can the existence of this force be proven? ’

Old man Zhuo looked at Jiang Xinghuo and asked his question.

"How can it be proved that there is some kind of power on the earth that sucks everything in this world?"

(End of chapter)