There was a lot of excitement on and off the stage, and they forgot that they were here to participate in the defense conference this time, and it turned out to be a painting appreciation conference for a while. The pen "Fun" Pavilion www.biquge.info Li Zong sobered up quickly, and said loudly: "In fact, Li Qing is not only last year's Tanhualang, he has outstanding literary talents, good paintings, and many other strange skills. In addition to the well-known tiger squat cannon, which played a decisive role in the battle against the Mongolian cavalry a few days ago, there is also a means of transportation called bicycles that have appeared in Lin'an today, which was invented by Li Qing. ”

Although the bicycle has just been introduced to Lin'an for a few days, it has become a household name, and nine out of ten people who participated in the defense conference know about it. Everyone in the audience was amazed again, and after a while, only one voice in the audience said loudly: "Since Li Gongzi has such a skill in painting, and he came to participate in the debate conference today, he must also have some opinions on this theory?" ”

Li Xiang turned his head to look, but it was that Jin Zhengzhuo, he was also looking at Li Xiang at this time, with a sense of disbelief in his eyes, probably thinking, although you have a good painting, and you say some vulgar words indiscriminately to force Ouyang Fan to have nothing to say, but today is a debate, it is impossible for you to keep messing around.

Li Xiangzheng hesitated, then listened to Emperor Lizong and said with a smile: "I just listened to the debate between Li Qing and Mr. Wu, I must have made some achievements, so I might as well speak out boldly and let everyone see it." ”

Li Xiangzheng hesitated, but seeing that Li Zong's eyes were full of encouragement and expectation, and he was somewhat prepared, he nodded immediately, stood up, looked around, and said loudly: "Actually, the doctrines of various schools just now have some truth, but they are all incorrect. The reason for this is that the so-called universe is not well understood, or in other words, it is impossible to understand its essence with current knowledge. ”

As soon as these words came out, the whole hall was shocked, and even Song Lizong showed disbelief. I only heard Jin Zhengzhuo ask loudly: "Dare to ask which school Li Gongzi is?" ”

Li Xiang blurted out: "I'm from the science and technology school." ”

After Li Xiang waited for everyone to calm down, he asked a question: "I heard you just say that the moon is full and missing, do you know why the moon has such a change?" Why does this happen every thirty days? ”

Li Xiang straightened out his thoughts and said slowly: "In fact, the land we live in is a sphere, and the place we live in, from Mongolia outside the Saiwai to Lin'an in the Great Song Dynasty, is only a fairly small part of this sphere, so the earth looks flat." The land we live on is actually called the earth, and there are still mountains and lakes at the other end of the sphere, which are still inhabited. ”

In fact, the theory that the earth is a sphere has long been proposed, and it was also proposed in the Song Dynasty. Shen Kuo, a scientist in the Song Dynasty, believed that the earth was a round sphere, and said in his description: "The celestial body is as round as a projectile, the earth is like a yellow chicken, and the sky and the earth are like a shell wrapped in yellow", and Shen Kuo put forward the theory of the armillary theory, just because there was no theory to prove it at that time, so this view was almost unrecognized, and Li Xiang put forward the same statement today, and everyone felt that Li Xiang was suspected of being in the limelight.

"That's a good question." Li Xiang began to feel a little like a professor.

"Before I answer, I would like to ask a few more questions, why do apples fall to the ground when they are ripe, instead of flying into the sky, or in any other direction? Why does the sun rise and set? Why are there four seasons all year round? Why do some of the stars in the sky move and some remain the same throughout the year? ”

Li Xiang asked several reasons one after another, and the audience was silent for a while, not that everyone couldn't explain, but they knew that Li Xiang's question must be different from the usual explanation, so they all quieted down to see how he continued. Li Xiang was extremely proud when he saw this, he still had some scruples in the face of the emperor and many scholars, but after arguing with everyone just now, Li Xiang relaxed, and at this time he was already thinking about the answers to these questions in his heart.

Indeed, these things are taken for granted in their eyes, and they are all natural and should be the way they should be. Although there are many theories or folklore to explain this phenomenon, but after thousands of years, there has never been an accurate answer, and although these have their own explanations, Li Xiang did not expect that he casually asked a few whys, which has long been out of the scope of science at this time, although he knows the accurate answer, and it seems that he can convince the public when he says it, but this matter eventually caused some trouble, so that no matter what kind of technology Li Xiang talks about in the future, he will talk about his 'master', or 'just' Tempting others to show some knowledge by themselves, so that it seems that the scholars of the Great Song Dynasty have their own research results, and Li Xiang just happened to knock on the side, and a new theory was born. Of course, that's another story.

At this time, after Li Xiang's few questions were asked, everyone naturally had no one to know, and only listened to Lizong ask: "Since Li Aiqing asked so, he must know the reason?" ”

Li Xiang said: "Back to the emperor, Xiaomin just knows a little, but in order to explain more clearly, please ask the emperor to prepare a large piece of paper and pen and ink for Xiaomin." ”

There was a ready-made paper and ink in the debate hall, and Ritsune immediately prepared a piece of paper one meter square and hung it on the wall.

Li Xiang cleared his throat, and everyone listened to him: "The reason why the apple falls to the ground and not in any other direction is because the earth is a huge sphere, and this sphere produces an attraction, and the sun, the moon, the stars, and even ourselves, produce this attraction. Therefore, it is also called gravitational force. And the apple will fall to the ground, and it is the attraction of the very center of the earth that is directed towards the center of the earth, and this force is the same everywhere on the surface of the earth, so that any point on the surface of the earth feels that the ground is under his feet. ”

Immediately someone said, "What evidence do you have for that?" If I were even, I would have been able to explain it."

Everyone laughed again, but Li Xiang was not in a hurry, first drew a big circle on the paper, and then drew eight small circles of different sizes on it, but these eight small circles were much smaller than the big circles. Then Li Xiang drew for a while, and everyone realized that the eight small circles were revolving around the big circle. Just listen to Li Xiang continue:

"The big circle in the middle is the sun. This third small sphere revolving around the sun is the earth, and at the same time as the earth revolves around the sun, there are seven other similar spheres, but some are very large, more than ten times in diameter than the earth. Not only does the Earth revolve around the Sun, but it also revolves itself. Every time the earth rotates, it is a day and night, and every time the earth revolves around the sun, it is a year, which is called the revolution of the earth. The Earth's axis of rotation is not parallel to its axis of rotation, and we are located in the northern hemisphere of the Earth. (To be continued.) )