In the main hall, everyone was immersed in Fang Jing's words just now, although some little dolls didn't think much about it, or just listened to it as a story, but in their eyes, they saw that Li Shimin and his wife were deep in thought, and they didn't dare to say anything, nor did they dare to make any sound, and the same was true for the guards.

Fang Jing looked at this quiet hall, looked at Li Shimin and his wife, and also went to see Gao Ming and Qingque from time to time, a prince and a king of Yue, thinking that after many years, these two goods were still fighting, fighting for the throne of the dragon chair, but in the end they couldn't get a good end.

Li Shimin frowned, the same is true for the queen, Fang Jing's words are too clear, Fang Jing took the chalk and drew the appearance of the earth on the blackboard, and then the sun, the moon, and other stars, depicting the entire solar system.

"Sir, can you really grow 800 catties of rice per mu in this world?" Li Shimin looked up at Fang Jing and asked.

"Shengshang, not yet, but it can be done in the future, but it needs people to study and explore, it is possible, if Datang continues according to the current state, it is estimated that it will be a thousand years before there will be a yield of 800 catties of grain per mu." Fang Jing didn't want to make up a lie to deceive Li Shimin, after all, the yield of 800 catties per mu was just a decimal, Fang Jing's previous life was a super rice with a yield of more than 2,000 catties per mu, not to mention the rice with a yield of 800 catties per mu.

If you convert the yield per mu in the previous life, according to the calculation of the acres of the Tang Dynasty, it is only the yield per mu of the previous life of less than 1,500 catties, Fang Jing does not know how the father of hybrid rice in the previous life accomplished this feat, but if you want to succeed, it is inseparable from a lot of time research, a lot of time experiments, and the discovery and cultivation of various rices.

Fang Jing is not a scientist, nor is he an agronomist, he doesn't know much about hybrid rice, or super hybrid rice, but for the cultivation of any species, he needs a mixed hybrid of various rice species, which is also thanks to Fang Jing's school when he was studying in his previous life, there are various majors in agriculture, forestry, flowers, grass, fish and animal husbandry, although he doesn't understand, but he has read this kind of book and can't remember much, but he still knows the overall framework.

"First of all, last year, I heard Guanyin tell me that the rice yield in Fangjia Village is one hundred and fifty catties, and I am very curious. Li Shimin was very anxious in his heart, thinking that he hoped that Datang would be able to popularize this method of planting rice that doubled the yield.

"Shengshang, you can send someone to Fangjia Village to verify and learn, and it can be promoted to the entire Datang in the future, so that the entire Datang family can have enough to eat, which is also what I want to see." Fang Jing has never thought of keeping the method of rice planting to increase yield secret, it is just a method, and Fang Jing can believe that there must be people in the south who already know this method, but it is very rare, and it should still be in a state of secrecy.

"Okay, okay, okay, if the entire Datang production is doubled, then my Datang people will be able to eat enough, and there will be no hunger, thank you, sir." Li Shimin shouted three times and saluted Fang Jing to thank him.

Fang Jing did not hope for this matter, even if the output could be doubled, there would still be people who could not eat, there would still be people hungry, there would still be a lot of people begging for food, the scholars and the elders of the clan would try their best to suppress them, all kinds of laws would not be established, the poor people would still be poor, the wealth of the rich people would still increase exponentially, and the rich officials in the feudal society would not pity you because you were a human life, because there were more such people.

"You probably haven't heard what I just said, but it's all ordinary things, so I'll talk about what the world is like, and everyone can listen to it as a story or a joke, but what I'm going to talk about next is real, and if someone makes a magnifying glass that can see the surface of the moon, then he can verify what I'm going to say." Fang Jing no longer continued to talk to Li Shimin, and with the chalk in his hand, he began to look towards the people in the main hall and began to teach again.

"On this blackboard, I have drawn many balls, the middle ball is our common sun, this is Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and our location is this Earth."

"The alignment of stars recorded in history is actually the arrangement between these celestial planets, but the ancestors said that this natural phenomenon is a disaster or a change in the heavens, in fact, this is a big joke at all, and the alignment of stars is the natural phenomenon of the most normal celestial stars."

"These eight celestial planets basically revolve naturally around the sun, and the earth where we are also revolves around the sun, and it takes a day to make a circle, day and night, so there is also the scene of the sun rising in the east and setting in the west."

"How much of the sun has? The diameter of the sun is 2.8 million miles, and the diameter of the earth under our feet is only more than 25,000 miles. ”

"This Mercury has a diameter of less than 10,000 miles, Venus is equivalent to the Earth under our feet, more than 24,000 miles, Mars, has a diameter of more than 13,000 miles, Jupiter is relatively large, with a diameter of more than 280,000 miles, Saturn has a diameter of more than 240,000 miles, Uranus has a diameter of more than 100,000 miles, and Neptune is almost nearly 100,000 miles."

"One might wonder why these stars revolve around the sun. In fact, it is very simple, just like we throw stones into the sky, the effect of force, because the sun is big enough, attracts these stars around and rotates itself, then the effect of this attraction is force, also called gravity, and the sun through the effect of gravity, attracts these stars around itself and revolves around itself. ”

"Some people may wonder, don't these stars collide? To put it bluntly, it really won't, just like if you take a stick and tie a few balls with several ropes of the same length, and rotate with the same force and speed, these balls will not collide, this is the effect of gravity, although it is very ordinary, but this is also the most intuitive method. ”

"The sun is too big, why does it shine and heat, to put it bluntly, because the sun is a fireball, it has been burning, it can be said that this big fireball may have been burning for billions of years, and it will continue to burn in the future, and it will burn for another billion years, so you don't need to worry about the sun burning out."

"Brother Jing, can I ask a question? Why doesn't there be a moon? Qingque has been listening to Fang Jing's narration very seriously, although there are many people who don't understand, but they also listen very carefully, and they also understand the rising and setting of the sun, and they also understand that people can return to Chang'an City if they set off from Chang'an to the west.

"Well, Qingfinch is good, you will ask where the moon is, I will talk about this question later." After Fang Jing finished speaking, he motioned to the guards to give Qingque a bowl of ice and joy.

"The sun is 2.8 million miles in diameter, so how far is such a big fireball from various stars, Mercury is 58 million kilometers away from the sun, and one kilometer is almost two miles, you can imagine how far away." Fang Jing was describing the distance of Mercury from the Sun, which was really a matter of numbers so far away.

"Venus is 110 million kilometers from the Sun, so how far is the Earth under our feet from the Sun, 150 million kilometers, Mars 230 million kilometers, Jupiter 780 million kilometers, Saturn 1.43 billion kilometers, Uranus 2.87 billion kilometers, Neptune more than 4.5 billion kilometers." Although Fang Jing can't remember too much data on these celestial bodies, but fortunately, Fang Jing is an astronomical pseudo-enthusiast, he doesn't delve into it, but he will also pay attention to it, Fang Jing is still half a military enthusiast, which makes Fang Jing have a certain understanding of some knowledge, otherwise Fang Jing would not be able to tell these data.

"Sir, may I ask, the earth under our feet, the earth you said, is so far away from the sun, why is the sun still so hot?" Li Shimin has been listening to Fang Jing's narration, although he has half an understanding, it does not affect him to continue listening, and many things have begun to make him have a new understanding.

"That's a good question, in fact, because we are far away from the sun, the heat of the sun will slowly dissipate when it is emitted, and the air we breathe is also one of the reasons to prevent the sun's light and heat, and there are many reasons to prevent the sun's light and heat, the air is the biggest blocker, the air is everywhere, you can't see and touch, we need air when we breathe, otherwise we will die." Fang Jing couldn't explain this problem of light and heat, after all, this belonged to the same vein of science, and Fang Jing didn't understand it any further.

"This is the moon, also called the moon, because these stars are basically in a spherical state, our ancestors sought the essence of things from nature, invented bowls, invented grinding discs, and invented many objects similar to circles, which shows that our ancestors had a considerable understanding of this natural thing." Fang Jing drew a very small dot on the blackboard with the moon on the edge of the earth.

"How far is the moon from the Earth where we are? 380,000 kilometers, that is, 760,000 li, how big is the moon, in fact, it is very big and small, the diameter is less than 3,500 kilometers, that is, less than 7,000 miles. ”

"Does the moon shine? Of course not, among these stars, only the sun will shine, and after the sun's rays shine on the moon, they will reflect to our earth, and we can see the moon shine, in fact, these are like mirrors, and it is a reason to shine on the sun to the dark corners. ”

"The moon does not revolve around the sun, she revolves around our home earth, because of the effect of gravity, the moon is attracted to rotate in the periphery, when a certain time or some time, people will see the scene of a lunar eclipse or a solar eclipse, which is known as the phenomenon of the tengu eclipse of the moon and the tengu eclipse of the sun, to put it bluntly, it is because of the sun, the earth, and the moon will appear in the same straight line at a certain period of time, blocking the light, and this phenomenon of lunar and solar eclipses will appear."

"The solar eclipse must appear in Shuo, Shuo is the first day of each month, that is, the first day of the lunar month, the time is uncertain, but it will basically appear every year, and the lunar eclipse will be relatively long in time, almost every thirteen months will happen, each time is the fifteenth day of the lunar calendar, so these are not natural disasters or man-made disasters, just a natural appearance of celestial bodies."

Fang Jing finished talking about the things between the celestial bodies in one breath, some things in the solar system, of course, there are more indescribable things in the solar system, but Fang Jing is not an astronomer, so he can't talk about too many things.

As for how these numbers came about, there is a clear record in Sun Tzu's Sutra, and Sun Tzu's Sutra is the ancestor of such topics as 'chickens and rabbits in the same cage', Sun Tzu is not Sun Tzu's Art of War, and no one knows who wrote Sun Tzu's Sutra, and Sun Tzu's Sutra appeared between five or six hundred years of public affairs.

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