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Volume 1, Chapter 520: Hands caressing the skin of a jade woman, talking about astronomical knowledge

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    The carriage I am riding in is a four-wheeled carriage designed by me personally. However, after being carefully crafted by the skilled craftsmen of Chang'an, this four-wheeled carriage not only retains the lightness and airtightness of my design, but more importantly, it also adds beauty.  The artistic level and appreciation style of the Chinese nation.  The driver sat in front and controlled the four horses pulling the cart. Beside the driver, each sat a vigilant and fully armed guard. At the back of the carriage, there were also two elite guards watching vigilantly.  all around to protect the safety of the carriage.  Everything inside the carriage is wrapped in beautiful and refined sheepskin, and the seats are stuffed with down, making the seats moderately soft and hard, and it is no problem to sleep on them as a bed. Well, the interior of the carriage is about one foot wide.  Miba, a space about two meters long, in the center of the carriage, is a steaming iron stove, with three people sitting on each side. And now, I am lying on the chair, with my head resting on Yaoguang's round thighs.  It was funny to see the Yaoguang girl's exaggerated eyes as she looked at this carriage that she had never seen before.  "It's so comfortable How did you make it, husband? You can also see the scenery outside the car from the inside. This seat cushion is really soft. Hey, husband, please don't make trouble" "What did I do? What's wrong with me?  "Do you like this car?" I reluctantly took back the trembling breasts that sneaked up on her chest, and said with a playful smile.  "Well, I like it, it's really beautiful, and it doesn't feel as bumpy as when riding in the car in the past. Husband, when did you get it?" Yaoguang girl pinched the tip of my nose with a shy look on her face and asked curiously.  "You don't know about this, right? Hehe, this is a long story. It starts from the time when your husband and I got in touch with that Turk and started the wine and horse trade" I held the Yao Yao in my hand.  He pinched the tip of my nose with his delicate hand, placed it on my lips and kissed me, then smiled.  "Four-wheeled carriages, indeed, I had this idea when I started the wine and horse trade with the Turks, but there is a serious problem with the roads.  The advantages of four-wheel vehicles are large carrying capacity and smooth operation.  The disadvantage is that the four-wheeled carriage needs a relatively flat road to travel on.  According to historical records, Roman wheelwrights discovered the Celtic four-wheeled carriage and further reformed it so that the four-wheeled carriage used a rotating front axle to adjust the direction of rotation and a full-piece rim and hoop to increase strength.  Also use wheel hubs with metal edges to reduce friction.  The performance of the carriage is greatly improved.  By 200 AD, sturdy Roman four-wheeled transport vehicles rumbled past the avenues, and horse-drawn mail coaches and passenger coaches could travel 160 kilometers per day, or 320 miles, stopping midway to change horses and continue moving forward.  In the following centuries, this kind of vehicle was replaced by various types of carriages that were stronger, lighter, more beautiful, and more efficient.  By the seventeenth century, four-wheeled public stagecoaches undertook almost all long-distance passenger transportation tasks, bringing prosperity to overland travel, while exquisite private carriages became a symbol of royal status.  Among them, the most luxurious British royal carriage was built for King George Qiao in 1763 and is known as "the most magnificent carriage in history".  The speed of four-wheeled carriages at this time had reached a formidable level. A fast stagecoach traveled 376 kilometers on the best roads at the time, which took about twenty-three hours, that is,  It takes less than a day to travel such a long distance.  At its peak, the Roman Empire had nearly 80,000 kilometers of flat roads. Driving on such roads, the advantages of four-wheeled carriages could be well reflected, making this kind of four-wheeled carriages very popular.  With the fall of the Roman Empire, the roads fell into disrepair and fell into disrepair over the centuries.  In desperation, the four-wheeled carriage gradually returned to the two-wheeled carriage because it was practical and could travel on rough terrain. ????????????? At the beginning of the wine and horse trade between this young master and the Turks, there was no suitable road to drive such a carriage, so this young master could only think about it.  But after I became the magistrate of Hancheng County, I finally started asking people to study various equipment about four-wheeled carriages.  Of course, the four-wheeled carriage I hope is no longer the original four-wheeled carriage, but a carriage that has springs or steel plates as shock absorbers and can be assembled and disassembled with screws for easy repair.  Nowadays, cement straight roads have spread throughout the Guanzhong area, and the number of horses in Guanzhong is also increasing rapidly. Therefore, the use of four-wheeled carriages naturally has perfect basic conditions.  Well, Hancheng County Carriage Machinery Company, which has already developed a prototype car, started designing and manufacturing it as soon as it received my order. Well, it was originally used as a car for my wedding. Unfortunately, it was eventually used as a car for my wedding.  Fang Xuanling and others forcibly stopped him and asked me to ride in a six-horse carriage to welcome the bride. Naturally, this beautiful new car was put away first. After all, I usually go out on horseback unless I have to go for a long distance.  , otherwise I wouldn¡¯t have the time to take a carriage ride.  Today, Yaoguang girl is going back home, so I naturally took it out to show off to the soft girl, and also feel the comfort of this carriage. With me as the spokesperson, I believe that the carriage will be used in the future.??, I will definitely be sought after by the wealthy businessmen and noble officials in Guanzhong. When the time comes, I will be able to earn a lot of money.  Compared with two-wheeled carriages, the biggest advantage of a four-wheeled carriage is its stability and comfort, which is especially suitable for long-distance travel. Anyway, let me sit in such a carriage with two beautiful girls in it and let me stay for ten days.  I have no objection for half a month. Of course, the premise is that these two beautiful girls must be Sister Qingxia and Sister Yaoguang. The four-wheeled carriage is indeed quite stable, and the shock absorption has been developed, so I sit on the carriage.  , at most, you will feel a slight bump, just like sitting on a rocking rocking chair, and even the shaking amplitude is not as large as that of a rocking chair.  At this moment, Yaoguang girl, whose novelty has passed, is lying in my arms, her slender legs are placed on the soft cushion, with a look of enjoyment on her face: "My husband is really smart, he can always invent some surprising things."  It¡¯s an unexpected thing, but it¡¯s very useful.¡± ¡°It¡¯s like this carriage. It¡¯s not bumpy at all, and it¡¯s very spacious and soft, even if I lie down on it, I don¡¯t want to.¡± ¡°Of course, I don¡¯t want to.  Who am I, your husband?" I said with a very proud smile.  "In this world, there is nothing you can't think of, and there is nothing I can't do." "Tsk, just brag. If you have the ability, can you pick off the moon for me?" Yaoguang girl curled her lips disdainfully and flirted with me.  He crossed his fingers and said in anger.  "Uh, well, hey, what's that expression of yours? Don't think it's your husband. I can't do it. It's because the moon is really too big, at least equivalent to a quarter of the size of the earth we are on.  How to pick it? Even if my husband really picks it, you can't take it. "As an excellent time traveler, I can't bear to see a beautiful girl be so contemptuous, especially if this girl is my mother-in-law.  "Really or not? No matter how I look at it, it's just a tiny bit. At most, it's the size of a plate. How could it be that big?" Yaoguang girl changed her arms to a more comfortable position and then raised her arms.  He gestured with his fingers towards the bright moon in the sky.  "That's because it's too far away from us, you know? It's at least760,000 miles away from us." I mentally converted the kilometers to miles and said.  Hearing this, Yaoguang girl¡¯s eyes suddenly widened and she shouted exaggeratedly.  "Seventy-six thousand miles? God, how far is that? Are you fooling me again? Humph, it must be." This young master almost became angry and pinched her perky breasts gently.  The tiger's body trembled.  "How could I, a scientific person who has always been rigorous, like me, fool you with such simple facts?" Yaoguang girl was attacked on her breast enlargement, and she quickly stretched out her hand to block it, but how could I, this gentleman, be so easy to deal with?  Yaoguang girl's resistance disappeared without a trace.  "Bad guy, you've never been to the moon, how do you know it's so far away?" Yaoguang girl curled her lips angrily, her pink lips looking so sexy and alluring.  I swallowed my saliva and must be serious in scientific research.  At least in terms of expression, well, my hands continued to lovingly play with the bulging plumpness of Yaoguang's chest. I said very rigorously: "Of course it is an answer obtained through rigorous calculations." "Really?" Yaoguang completely said  Attracted by the light of wisdom emanating from my brain, she didn¡¯t notice my hand at all. Perhaps Yao Guang, who had given up resistance at this moment, actually acquiesced to my behavior in her heart, just out of doubt.  Cover up, she is indeed my mother-in-law.  "Of course it is true." I cleared my throat and started to speak eloquently: "Far away in the land of Western Qin, in the federal country of ancient Greece, there were scholars who measured the distance from the earth to the moon. Of course, if you want  To measure this distance, you must first have a suitable reference object. After all, the distance and size of celestial bodies are difficult to measure, but as long as a starting point can be determined, then its various manifestations on the earth can be quantified.  " This is true. A real person like me never deceives others. In the third century BC, the Greek astronomer Guladosenes measured the radius of the earth for the first time.  Because he discovered that on the day of the summer solstice, when the sun shines directly on the well (set as point B) in the city of Sai (which is now Aswan, Egypt), the zenith of a point in Alexandria (set as point A) (  That is, the point where the plumb line extends upward infinitely and intersects with the "celestial sphere" in the sky) and the angle between it and the sun is 2 degrees.  He believed that the two places were on the same meridian, so the central angle 8A subtended by the arc between the two places was 2 degrees. He also knew that when the caravan traveled, the distance between points AB was measured to be about 5,000 ancient Greek miles.  , he passed a formula based on the relationship between arc length and central angle and calculated the radius of the earth to be four thousand ancient Greek miles.
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