Liu Ze was silent, took out a wine glass from the gift box, and threw it in the air, although Liu Ze threw it very high, it fell faster, and smashed it into Ruan Yu's head impartially, Ruan Yu was so frightened that he hurriedly dodged to the side, but Liu Ze calmly took the wine glass in his hand, and said with a slight smile: "Brother Ruan can tell me why I threw it out so vigorously and it still fell?" ”

Ruan Yu couldn't answer, and said slyly: "The sky is up and the earth is down, so naturally it will fall." ”

Liu Ze didn't expect him to be able to answer, and there was really no one who could give an answer professionally before Newton. Nai smiled and said: "No, no, it's actually very simple, that is, gravity, everything has gravity, but there is a difference between strength and weakness, because the earth is big enough, so the gravitational force is strong, and no object can escape from his surface, even if it is as light as air, unless you can have the ability to run more than 30 miles in a breath to break out of the earth's gravity, so it is not necessary to say that Brother Ruan's head will fall down." ”

Everyone couldn't help but take a breath, try how long a breath is, and you can travel more than thirty miles in one breath, only immortals, right? Ruan Yu said: "How can you believe strange theories? Do you believe it? ”

Gu Yong and Lu Cui both shook their heads. Du Caiyan nodded and said, "I believe it." ”

Ruan Yu was angry, didn't Cai Yan want to drive Liu Ze away, why did he help him talk again at this time, it's really hard to guess what a woman thinks. "Senior Sister Yan, you-"

Cai Yan said lightly: "I'm helping people, not helping relatives." She walked to Liu Ze's side in a curling manner, her figure was graceful and graceful, Liu Ze couldn't help but fantasize about the impact of sight, smell and sensation that this carcass had brought, he secretly swallowed his saliva, and couldn't help but secretly scold himself for being obscene, but he was not a saint, and he didn't have the magic skills that Yanagi Megumi practiced to sit still, so he could only make himself calm and calm.

He smiled and said, "Miss Cai really believes what you say? ”

Cai Yan said: "Zhang Heng has a saying about the heavens: the heavens are like chickens, the celestial bodies are round like projectiles, the earth is like a chicken in the yellow, and they live alone inside,...... The sky envelops the earth, and the shell is wrapped in yellow. What Liu Gongzi said has the same meaning as Zhang Heng, but I need evidence, and I believe that Liu Gongzi is not just talking about it, and he can come up with convincing evidence. ”

Liu Ze said secretly, very obedient, sure enough, she is one of the four talented women, and she is different from others when she sees it, Zhang Hun's Hun Tianzhi theory can only be classified as a hypothesis because there is no corroboration, and it is difficult for the world to believe it, after all, the concept of a round sky and a round place has long been deeply rooted in the hearts of the people, and it is not an overnight thing to change the fixed thinking in people's minds. However, Cai Yan can see some clues from Zhang Heng's writings, although she is a little puzzled, she still firmly believes that the greatest scientists since ancient times are by no means true.

Liu Ze took a deep breath, it seemed that it was necessary to educate them on popular science.

"Actually, to prove that the earth is round, it's very simple, you have all been on a boat, on the river or on the sea, if there is a ship coming by, see the mast and sail first or the hull first?"

This question, naturally, Gu Yong from Jiangdong has the most right to speak, Gu Yongnai said: "Naturally, I see the mast sail first and then see the hull." ”

"May I ask why Brother Gu is like this?"

Gu Yong said ashamedly: "Unknown." ”

Liu Zedao: "If the earth is flat, the ship we see must be the whole, and the spherical surface, because there is enough distance between the two ships, there is a certain arc, so we can only see the mast sail at the top and then see the hull at the bottom, which proves that the earth is not square but spherical, which is one of them." Second, Brother Gu and Miss Cai have lived in Jiangdong for a long time, and they should know that the sun in Jiangdong and the sun in Luoyang are not in the same position on the day of the summer solstice. ”

Everyone has never been to Jiaozhou or further south, but the "strange" scene of the sun hanging in the north sky is unheard of, and now most people still use the sun to identify the direction, if as Liu Ze said, isn't it that there is no distinction between north and south, and it is difficult to distinguish between east and west.

Ruan Yu snorted: "It's nonsense. ”

Cai Yong opened his mouth and said: "The old man has read the Chronicles of Rinan County, which records that there are dozens of days of the sun and moon hanging in the north every year. "Rinan County is in the southernmost part of Jiaozhou, close to the equator, so naturally the sun will reach the north around the summer solstice every year. When it comes to being knowledgeable, Cai Yong is unsurpassed in the Han Dynasty, and since Cai Yong said so, naturally no one refutes it.

Ruan Yu snorted heavily: "Even so, it can only be judged that the earth is not flat, and it cannot prove that the earth is round!" ”

Liu Ze said: "Actually, you have all seen the appearance of the earth, but you can't understand it. ”

Everyone looked puzzled, but Cai Yan groaned for a while and said, "Can it be a lunar eclipse?" ”

Liu Ze praised: "Miss Cai is really smart, she guesses it, but the poor people in the world only think that it is the Tengu Eating Moon." ”

Cai Yan was praised by him, but it was a little astringent, and said softly: "Tiangu eating the moon is originally nonsense, according to Zhang Heng, the moonlight shines on the sun, and the spirit is born in the sun; The day is bright, and the day is gone, but I don't know the reason, and I don't dare to make a conclusion. ”

Liu Ze smiled and said: "Miss Cai is well-read and has an admirable range of hunting. In fact, the operation of heaven and earth has its own laws to follow, and the will of non-human beings can be transferred, and it has nothing to do with human morality. Everyone, please see—" Liu Ze found two more spherical objects and placed three balls of different sizes on top of several cases.

"The largest represents the sun, the smallest represents the moon, and the middle one represents the earth, and the position of the sun is constant relative to the earth and the moon, and the earth revolves around the sun, and the week of the calendar is three hundred and sixty-five days, which is one year. The earth does not travel vertically around the sun, but is slightly tilted, and the sunlight varies from one day to the other. The earth itself rotates itself, and each revolution is twelve hours, which is one day, but the rising and setting of the sun we see is not the sun moving, but the earth itself rotating. The moon revolves around the earth, and one rotation is for January. If the sun, the earth, and the moon are in the same straight line, the earth will block the sunlight on the earth, forming a lunar eclipse (eclipse), and the tengu eclipse of the moon that you have seen is the shadow of the earth, and it is not difficult for us to see that the earth is actually a huge sphere. ”

In order to make everyone more intuitive, Liu Ze said while fiddling with the three spheres in his hand, and described the movement of celestial bodies and the production of lunar eclipses in the most concise way.

Liu Ze's words were like a bombshell, exploding violently, completely subverting the inherent things in everyone's hearts, what the sky is round, what the sun rises and the moon sets, all are illusions, but what Liu Ze said, who can believe it?

Cai Yan sighed: "Listening to your words, it is better to read for ten years, I didn't expect that the doubts that have plagued me for many years have been solved by you, thank you." ”

Liu Ze said humbly: "In fact, compared to the vastness of the universe, the earth is just as small as a grain of sand, and the sun is just the most ordinary one among the hundreds of millions of stars in the Milky Way. And one of the qiē we see is just the tip of the iceberg of the universe. The process of seeking the truth will be tortuous, but mankind's search for the truth will never stop, and the truth will not be annihilated forever. ”