In ancient Greece, it was about 158.5 kilometers, so the radius of the earth he measured was about 6,340 kilometers. Later generations calculated the radius of the earth many times, and the difference from the radius he calculated was only a few dozen kilometers.

Because ancient Greek scientists had calculated the circumference and diameter of the earth, they used this as a basis to conduct clever geometric calculations and finally calculated the distance from the moon to the earth. Although there was a certain difference from the distance measured by radar lasers in the 21st century, the conclusions they came to are very close to the facts.

After listening to my story, Yaoguang couldn't help but exclaim: "They are so powerful, they are so powerful. Just by observing the things on the ground and carefully observing them, they can calculate such a long distance."

"Yes, the wisdom of the ancients cannot be easily taught. More importantly, we, even our future, must work harder, at least not even the ancients cannot compare with each other." I sighed and replied.

Before the Qing Dynasty, the Chinese nation was obvious to the inventions and creations of science and technology in the world. However, when it was invaded by foreign races, the open thoughts and active thinking in the national bloodline were gradually destroyed and strangled.

Fortunately, I am here. I have traveled through a long river of history and came to this era. I will stand up and let various disciplines such as natural science, astronomy, geography, chemistry, physics, mathematics, etc. become professional learning subjects, so that those Chinese talented people and wise men should not just focus on Confucianism, and have been rumoring the Four Books and Five Classics all day long for thousands of years.

As an excellent student, you must be proficient in mathematics, physics and chemistry, know astronomy and geography before you can become a teacher. In this way, the Chinese nation will firmly grasp the key to science. In the future, it is not impossible to become the master of the solar system and even the entire Milky Way.

"Husband, do you even know this?" The Yaoguang girl's eyes were bright, like the brightest star in the Milky Way. She looked admiring and joyful. Yes, she was sincerely proud of her husband who had such a knowledgeable, talented, talented, and skilled in scientific inventions.

"Yes, good wife, do you know that you are not only aware of it, but also spent a lot of money to collect a large number of works by Western barbarians in the eastern capital Luoyang and Chang'an. There are many of them, which are what China needs today." This young master kissed the white and smooth face of Yaoguang girl, and smiled proudly. "Not only are there academic and literary works from ancient Greece, but also many good things from ancient Rome and ancient Persia..."

The girl Yaoguang was caught off guard against being attacked. She couldn't help but yelled softly, and wiped the place where I kissed with her hand in disappointment. "Bad guy, don't do anything randomly."

This young master laughed twice, ready to continue to break the bad, but he felt the carriage pause and gradually slow down. Hears and voices came from outside the carriage. Damn, the mansion of the Duke of Tang has arrived.

After opening the carriage door, I saw Li Shimin and my sister standing on the steps at the door of the mansion, looking at us in surprise.

I jumped out of the four-wheeled carriage, and was about to prepare the gentleman to welcome the Yaoguang girl. The girl had already jumped out of the carriage and greeted Li Shimin and my girl. Alas, the young master's hand stretched out could only pretend to pat the door, as if he was trying the thickness and hardness of the door.

"Isn't this kind of carriage made by you, brother?" The girl who was a woman, still did not change her gossip nature. She walked up with curiosity and looked at the strange-shaped four-wheeled carriage. However, Li Shimin was not much better. After saying hello to me, she wandered around the four-wheeled carriage.

"Hey, it's really good. I said, brother, this thing is probably expensive, right?" After wandering around the four-wheeled carriage, Li Shimin Yu Qian jumped into the car and tried it, his eyes brighter and brighter.

"The price is not expensive. The total cost of my specially customized four-wheeled carriage is only about 1,100 yuan. Even if it is sold, it will be about 2,000 yuan." I replied after a smile.

"Really? Brother, why don't you sell me one at the cost?" Li Shimin seemed to like this special shape and comfortable four-wheeled carriage.

I curled my lips and said disapprovingly: "Are you sure you want to buy it?"

"As long as you are willing to sell it at a cost, how can you miss your good intentions?" Li Shimin jumped out of the carriage with a despicable smile on his face, patted the body of the car with satisfaction and said.

"This is not bad, but you have seen it. If this car wants to be light and fast, it will take four horses. But if there is only horse, there must be roads, and cement straight roads like Chang'an and Guanzhong." This young master replied with an equally obscene smile.

Li Shimin couldn't help but grin, looked at me, looked at the carriage again, and then looked at the carriage again with Yaoguang and didn't know what to count. Wugui kept looking at the carriage. He gritted his teeth and stamped his feet. "Buy, what are you afraid of? Although I'm afraid of being in Chang'an, my wife and my mother are there, I can't sit there, and they can ride it."

"Okay, I'll just say this to you, and I'll get the fraction of it for you." This young master patted the guy on the shoulder and smiled. The actual cost was only about 400 guan, but I was a businessman, so it was naturally impossible for me to turn out my trump card to show this guy a real thing.

"Brother, if you want it, would you be embarrassed to collect the money?" Just as Li Shimin was about to nod and agree, my girl, the ignorant girl, spoke up and blocked me on the spot with one sentence.

"I am your sister. Do you really want to collect money from your own girl? Humph, if you really want to do this, I will let my mother know when I get home." My sister looked very aggrieved, but her wandering eyes were really treacherous.

I could only smile helplessly and raised my thumbs up at the girl: "Little girl, you are cruel, I have lost to you."

My sister showed a happy smile on her face and bowed slightly to me: "That's really thankful to brother. Sister Yaoguang, don't blame my little sister for being greedy for money."

"Where can't you know that your brother is the number one rich man in Guanzhong? You can just blackmail it." Seeing this young master's helpless but amused expression, the girl almost bent over and laughed.

"There is no choice. Who told you to be my girl? As long as you want, just talk, think about others, and think about me. I will definitely be fine with my own girl." I shook my head, looked at the girl with a smile, raised my hand and rubbed her head and said.

"Brother, don't rub my head, I'm a big girl." The sister stroked her hair bun angrily.

"That..." Li Shimin looked at his wife and my girl with a smile, her eyes full of tenderness and sweetness, but when she turned her face to look at Yao Guang, she opened her mouth, um, her expression was strange and hesitant.

"I said Shimin, what are you?" This young master came closer and asked curiously.

"I have a headache, why should I call me a girl? Logically, she is my sister, you should be my sister-in-law, but now, I have married your sister and become your sister-in-law..." Li Shimin said sadly with his fingers.

Khan, such a tangled problem has emerged again. I remember that Yaoguang girl had also been confused at that time, but all this is really a slight connotation for me.

"It's not simple? What's the name in the past? What's the name now? You can't just call yourself dizzy." This young master waved his hand and said. After thinking about it, my sister Li Shimin and his sister thought about it, she also felt that this was the best solution at present.

My sister blinked: "Uh, in the future, if you have a child, that name..."

I smiled and patted the girl on the shoulder and said, "I said sister, you are a typical worry about eating salty radish. What they want to call her is their business. Let's take care of ourselves. He can't solve it, so they can have a headache."

Sister Yaoguang nodded deeply, held my sister in his arms and walked forward. "I'm sure you're right, hurry up and go in..."

Li Shimin raised his thumbs at me speechlessly, and it seemed that he also sincerely admired my master's IQ.

After entering the mansion, you can see a figure waiting outside the front hall from afar, looking out here. Who else can be there except Queen Dou?

The Yaoguang girl paused at first, then let go of her hand holding Wugui, rushed straight over, and plunged into Queen Dou's arms like a lactation swallow.

Then, she burst into tears, so scared that I stood under the steps of the front hall and didn't dare to walk up, because Queen Dou hugged her daughter tightly and kept asking if someone was bullying her. While asking, she stared at her pair of sharp eyes that were as sharp as a razor, which was fiercely harsh in her time travel.

"Hey, I said, brother, you won't really bully my girl, right?" Li Shimin was also shocked and couldn't help but pull me gently and asked in a low voice.

"How can a gentleman who is so gentle and kind to others bully your girl?" This young master glared at this guy with a grievance. "Your sister is so powerful that she can lift a tripod. Do you think I can bully her? Throw me and your girl together to fight. If your girl loses, it will be a strange thing in the world.

Even if it is bullying, it is still the kind of bullying. However, even Duke Zhou allowed it. Even Kong Lao Er said that he had food, sex and nature. Could this kind of bullying be wrong? If there is really a mistake, wouldn’t it be strange that the Chinese nation that has already respected the rituals will become extinct?

Li Shimin almost fell on the steps when he heard this, and pointed at me laughed and cried. Well, he must be speechless to distinguish between this young master's righteousness and Taotaoxiong.
Chapter completed!