As we all know, the Ming Dynasty had a strict household registration system.

But few people know that in addition to military households, artisan households, and music households, there is also a kind of yin-yang household, and its descendants are all yin-yang people.

It's not stubborn, it's a yin and yang person!

Born in the Yin-Yang household, they must learn professional knowledge from an early age, and after graduation, they will become Yin-Yang people, and serve as Yin-Yang officials at all levels of the yamen, and those who are proficient in academics can be recruited into the Qintianjian.

In principle, Yin-Yang officials cannot be recruited externally, nor can they be promoted to other departments. However, there are a few exceptions, such as folk masters being hired as yin-yang officials, and some of the officials of the Qin Tianjian can be transferred to the Ministry of Rites.

Li Jian, the petty official of Qin Tianjian, was born in a yin-yang household, and his ancestors have been yin-yang people for generations. His research direction is Feng Shui, and Li Jian is one of the main designers of the mausoleum of Emperor Jiajing in history.

However, Li Jian was also proficient in astronomy, and at this time he served as the official of the Eight Pins of Spring, responsible for the solar terms and astrological signs of spring.

That night, Qin Tianjian Zheng Li Yuan summoned all the astronomical officials. Pointing to the astronomical telescope, he said, "Your Majesty has an order, let me wait to use this magic mirror to observe the moon carefully!" ”

What's so nice about the moon?

A solar eclipse is a big event, and a lunar eclipse is commonplace, and even the yin and yang students who have not yet reached the crown can easily predict the time of the lunar eclipse.

This is not how smart Yin and Yang are, but the Chinese sages have long calculated the number of angles between the ecliptic, equator, and white path. Based on the observations, the law can be predicted, as long as the established formula is followed and the time of the eclipse can be predicted after complex calculations.

It's just that this rule is occasionally inaccurate, and you can only consider yourself unlucky when you encounter special cases.

The first person to come over to see the moon was Zhou Zuo, the deputy superintendent of Qintian. He lay there silent for a long time, dumbfounded, and bewildered others.

Li Jian is the sixth viewer, and the cratered surface of the moon brings him a kind of soul impact, subverting the worldview formed for more than 20 years!

At night, more than 20 astronomical officials stood on the observation platform and looked at each other.

"Ahem!"

Li Yuan coughed twice: "Your Majesty said, there is no need to cover it up, don't publicize it, everything will go naturally, and let me wait to study the celestial phenomena carefully." ”

"So, what exactly is the moon?" Zhou Zuo raised the question in his heart.

Li Yuan said: "The king of the Hanlin Academy believes that the moon is a sphere in the void, and the same is true of the earth where we live. ”

"Hun Tian said that the fusion Xuan Ye said?" Li Jian exclaimed.

China also has its own model of the universe, that is, it is not heliocentr, nor geocentric, but the armillary theory, the Gai theory, and the Xuanye theory.

Gai said that it was "the sky is round and the earth was round", Hun Tian said that the universe was like an egg, and Xuan Ye said that the sun, moon and stars were floating in the void. The three models of the universe are parallel and have been adopted by successive astronomical officials, and they have not yet been able to fight for a reason.

The ancient Chinese calendar used mathematical models to approximate geometric models. For example, the formulation of the "time calendar", that is, observing the trajectory of the sun and segmenting it, each segment is solved by cubic equations, and the orbits of various planets can be deduced. It has nothing to do with heliocentrism, it has nothing to do with geocentrism, no matter who revolves around whom, it does not affect the mathematical calculation!

Li Yuan also told Wang Yuan's theories of gravitational force, centripetal force, centrifugal force, etc., to officials at all levels of Qin Tianjian, and then asked everyone to verify it with the observation data of previous years.

In the next half month, Li Jian, a small eight-rank astronomical official, buried his head in the vast sea of observation data.

Ancient Chinese and Western astronomy had their own advantages.

The West has a geometric model of the universe, that is, the geocentric theory and the heliocentric system, but it lacks massive observation data. China does not have a geometric model of the universe, but it has thousands of years of observations, and the accuracy of observations far exceeds that of the West.

When Li Jian was doing data verification, his mind suddenly turned around. Inspired by gravity and having observed the moon with his own eyes, he subconsciously had an idea similar to the "geocentric theory". However, it is different from the Western geocentric theory, which holds that the earth is stationary, while Chinese astronomical officials believe that the earth is moving.

Immediately afterwards, Li Jian fell into doubts again, if the earth is moving, then who is it revolving?

Sun!

Li Jian turned out the astronomical observation data of the Ming Dynasty in the past 150 years and verified them one by one. Then he was surprised to find that if the sun was the center of the universe, then all the observations would match!

Even, through these data, Li Jian actually sorted several major planets!

With countless observations to support it, once you think of the heliocentric theory, it is equivalent to piercing the window paper, and the rest of the content is just a supplement.

Li Jian did not discuss it with his colleagues, but went to visit Wang Yuan to learn more about gravity.

Wang Yuan didn't explain, and threw the physics manuscript he wrote to Li Jian and asked him to copy a copy of it himself.

It was as if a new world had been opened, the world of physics, the world of astronomy, and Li Jian felt that he had touched the mysteries of the universe.

"Correction, this is the result of my recent research." Li Jian handed Li Yuan a stack of manuscripts.

At the top of the list is a schematic map of the solar system, but the order of the planets is a little wrong!

Li Yuan did not dare to slack off, and summoned more than 20 astronomical officials to verify the theory of the solar system. Except for the controversial planetary order, everything else was recognized, and then stared at each other at a loss, followed by shouting with joy.

This thing was very sensitive in ancient China, but it was nothing more than that, and it was not hindered.

Historically, after Xu Guangqi came into contact with the geocentric theory, he actually used his theory to compile the "Chongzhen Almanac". I didn't see the emperor jump out to stop it, as long as it was practical, the Chinese have always followed pragmatism.

Li Yuan rushed into the leopard room and presented a map of the planets of the solar system: "Your Majesty, Qin Tianjian is inspired by Master Wang and knows that the sun is the center of heaven and earth!" ”

"Is that so?" Zhu Houzhao was surprised.

Li Yuan said excitedly: "This is indeed the case. And with this star map, you can get twice the result with half the effort in the future by measuring the stars. ”

Zhu Houzhao inquired in detail again, and then rewarded all the officials of Qin Tianjian with one or two pieces of silver. And Li Jian, who put forward the heliocentric theory, was promoted to Zhongguan Zheng, although the grade has not changed, it is the promotion of Zheng'er Bajing, just like the right waiter was promoted to the left waiter, and the power and responsibility are heavier.

Qin Tianjian's future work is also divided into two directions.

One direction is to refine heliocentrism, and the other is to adjust the worldview.

The so-called worldview here refers specifically to imperial power. Astronomical officials believe that the solar system is the center of the armillary sky, and the theories of the past dynasties are still used outside the solar system, including the Gai Shuo, the Armillan Theory, and the Xuanye Theory.

The emperor is still Zi Weixing, which does not conflict with the "heliocentric theory", because Zi Weixing is in the outer sky and has nothing to do with the solar system.

Since then, the yin and yang students of the Ming Dynasty have three must-read textbooks: "Mathematics", "Geometry" and "Physics"!

No matter which province Wang Yuan went to, the local yin and yang officials spontaneously saluted him as a disciple.

Outsiders don't know the inside story, and they think that Wang Yuan is a master of yin and yang, and when he was a child, he was taught three volumes of the Book of Heaven by a stranger in the mountains, and he was treated with Liu Bowen in the book.

(I came home late, and I drank alcohol, and this chapter was temporarily rushed out, and the chapter I owe will be made up tomorrow.) ）