Three days later, outside the Hongwu Gate of the imperial city, there were already crowds of people gathered here. They all stretched their necks and looked at the imperial city gate. They saw an old man in a dragon robe sitting upright under a yellow umbrella on the city gate, and there were many people around them. It was Zhu Yuanzhang, the founding emperor of the Ming Dynasty.

Zhu Yuanzhang picked up the teacup and sipped it, then asked Zhu Biao next to him: "Li Jie is really confident that he actually wants to prove that the earth is like a ball in front of so many people."

"Qi Bian, Li Jie actually has his own difficulties, because according to what he said, to prove that the earth is like a ball, it requires a large enough field. The imperial city cannot be used at all, so he can only go to this square outside the imperial city." Zhu Biao replied with a smile.

"This is interesting. When will he arrive? I really want to see what methods he uses now?" Zhu Yuanzhang also said with a curious expression when he heard this.

"Your Majesty, I was not sure about seeing Li Jie, so I didn't dare to come, right?" At this moment, an official stepped forward and sneered. This man was Yuan Jianzheng who was betting with Li Jie. He also came to the palace early in the morning. He had just waited for so long but did not show up. This made him wonder if Li Jie had escaped?

"Don't worry, Zheng Yuan, Li Jie is just going to get some things, and he will probably come soon!" Zhu Biao explained with a smile.

"Here, I'm here. I saw them on the way to come, and I'll be here soon!" At this moment, an old man with a bad appearance came over with a smile and saw that his skin was dark and wrinkles were all over his founding hero. He was the evergreen tree Tanghe.

"Oh! Lao Tang, are you here to join in the fun?" Zhu Yuanzhang immediately laughed happily when he saw his old friend Tang He. The old brother died and retreated. The only person who stayed and made him trust was Tang He.

"Your Majesty, don't you understand me yet? I'm just a good guy. I'll go wherever there is no excitement. The capital has been discussing this matter for the past month, and I don't want to miss it!" Tang He came to Zhu Yuanzhang with a smile and said, "He is the Duke of the State and has the concession of Zhu Yuanzhang, so he doesn't have to bow at all. Instead, Zhu Biao, as the crown prince, wants to bow to him."

While talking, I suddenly heard a heavy sound of wheels. Then several large cars passed through the crowd and then slowly stopped in the middle of the square. Then more than a dozen people dressed in craftsmen got out of the car and immediately started to work.

Li Jie walked out of the convoy, then quickly came to the city gate, and solemnly saluted Zhu Yuanzhang on the city gate: "See Your Majesty, I am late. I hope Your Majesty will forgive you."

"No need to be polite. Now you can always tell us how to prove that the earth is like a ball, right?" Zhu Yuanzhang also stood up and held the city wall and asked Li Jie below.

"I don't know the true face of Mount Lu because I am in this mountain. I want to ask Your Majesty. What should I do if I want to truly see Mount Lu clearly?" Li Jie suddenly asked Zhu Yuanzhang with a smile.

"This..." Zhu Yuanzhang was stunned, and then replied, "Isn't there an answer in the poem? I can't see Mount Lu clearly. That's because I'm in Mount Lu, if I want to see Mount Lu clearly, I naturally have to leave the mountain. As the saying goes, bystanders are clear, and if I stand farther, I can naturally see the entire Mount Lu clearly."

"What Your Majesty said is that the reason why we cannot see the truth of the earth under our feet is because we stand on the earth and see nothing but a radius of land. If we want to see the entire earth clearly, the only way is to leave the earth!" Li Jie reported the report very seriously.

"Boy, why can't I understand what you say? How can a person leave the earth? Could it be that you want to fly?" Before Zhu Yuanzhang could answer, Tang He next to him asked in confusion.

"Duke Xin Guo is right, I just want to fly. As long as you fly high enough, you can see the whole picture of the earth clearly!" Li Jie raised his head and replied with a smile.

There are many ways to prove that the earth is spherical, such as observing the changes of stars, the reflection of the earth on the moon, etc. Some people can even calculate the circumference of the earth through calculations.

However, Li Jie did not intend to use the above methods. In fact, he didn't understand it either, but he knew a simple and crude method, which was to fly and see it directly with the naked eye. This is the so-called dimensionality reduction strike. No matter how exquisite the calculation is, it is not as real as the real thing.

"Absurd! Li Jie, you dare to talk in front of His Majesty!" Yuan Jianzheng on the top of the city finally couldn't help but step forward and pointed at Li Jie under the city and scolded him.

In fact, it is not a big deal for Yuan Jianzheng. When the crowd around the square heard that Li Jie was about to fly, they were in an uproar. Everyone showed a look of suspicion. Although Feitian had happened in the dreams of countless people, no one had ever done it.

"Li Jie, you... aren't you kidding?" At this time, even Zhu Biao, who had always trusted Li Jie, couldn't help but ask. He really couldn't believe that people could fly, and he also found that his father's face became a little unfair at this time.

"Don't worry, Your Highness, how dare I joke at this time? In fact, I'm preparing the tools for flying in the sky this month!" Li Jie said, pointing to the busy craftsmen behind him.

"Are you sure you can really fly?" Zhu Yuanzhang asked with a gloomy face at this time. He was originally a little confident in Li Jie, but when he heard that Li Jie's method of proving that the earth was like a ball was to fly, his trust in Li Jie suddenly disappeared.

"I am willing to guarantee it with a head, and I will fly to the sky in person. In addition, I also ask Your Majesty to agree and let Yuan Jian accompany me to fly to the sky, so that he can see the appearance of the earth with his own eyes!" Li Jie spoke solemnly again.

"Okay, I promise you!" Zhu Yuanzhang felt a little disappointed when he heard that Li Jie actually used a head to guarantee the situation. And if he could really fly, you will know at a glance that if Li Jie really dares to deceive the emperor, then don't blame him for turning against him ruthlessly.

"Your Majesty! Li Jie..."

Yuan Jianzheng wanted to say something else, but was interrupted by Zhu Yuanzhang waved his hand and said, "No need to say much, go down and go with Li Jie to see what he is going to do!"

Yuan Jianzheng did not dare to speak again, and immediately agreed honestly, then turned around and got out of the city gate.

Li Jie immediately turned around and ordered the craftsmen to assemble the things he brought. Soon a huge airbag spread into half a square, and then the hanging basket began to be installed. This thing was the hot air balloon made by Li Jie for the Military Weapon Bureau.

After a while, the hot air balloon was assembled, Li Jie personally stepped forward to ignite the fire. As the flamethrower was ignited, the heated air entered the airbag, and the airbag slowly bulged up and slowly floated in the air, which also caused the people around to exclaim, and Zhu Yuanzhang and others on the top of the city also showed a look of shock.

"It actually...it really floated up!" Zhu Biao looked at the floating airbag and looked unbelievable, especially when the airbag started to float with the hanging basket below, it completely dispelled his suspicion. It seemed that this thing could really fly.

"I understand, this is a large Kongming lantern!" Zhu Yuanzhang suddenly slapped the city wall and said excitedly.

"Yes, Your Majesty is wise. No wonder I thought this thing looked familiar just now!" Tang He next to him immediately agreed.

Zhu Biao and others also showed a sudden look when they heard this. They were shocked by the fact that this thing could fly, but they didn't know the reason. Now when they heard the Kongming lantern, they all understood it. After all, the Kongming lantern is something they can touch. Although they don't understand the principle that the Kongming lantern can fly, at least the things they are familiar with can make them more accepting.

Yuan Jianzheng, who was standing next to Li Jie, also opened his mouth wide and looked at the floating hot air balloon. He was still suspicious just now, but now the facts are placed in front of him, he can't help but believe it.

"Are Master Yuan ready? We are going to put on the hanging basket now, and then experience the first manned flight in human history!" Li Jie smiled and said to Yuan Jianzheng. For this hot air balloon, he has been sleepless for the past month, and has consumed countless efforts. Now he has lost ten kilograms than before.

Moreover, after making the hot air balloon, Li Jie also tested the flight outside the city several times, and directly modified it when he found the problem. He experienced three major changes and countless minor changes. Finally, the performance of the hot air balloon was stabilized. However, during the test flight, many people should have been scared. Some people saw the hot air balloon calling monsters in the sky, while others regarded it as a god. It is said that there were many rumors in the capital for this.

However, before Yuan Jianzheng could answer, he suddenly saw two people running out of the crowd, and then came to the city gate to salute Zhu Yuanzhang above and said, "Mahama, deputy chief of the Imperial Heaven Supervision, and Guo Zhenglin, the deputy chief of the facial features, see Your Majesty!"

"Huh? What's wrong with you?" Zhu Yuanzhang knew Ma Hama, and when he saw them running over, he asked in surprise.
Chapter completed!