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Chapter 391 This is too simple

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    In the Wenhua Palace, the emperor and ministers stared dumbfoundedly. Zhao Hao used the model of the solar system to demonstrate the causes of solar eclipses, lunar eclipses, and moon phases.

    But to be honest, there is no need to prove other than that the moon phases are there because of the moon¡¯s waxing and waning.  Everyone still can't believe that the causes of solar and lunar eclipses are so simple.

    It clearly demonstrates why solar eclipses only occur on the first day of the lunar month and lunar eclipses only occur on the 15th day of the lunar month.

    However, this bit of evidence is far from enough to convince the public.

    So everyone¡¯s eyes turned to Qintian Supervisor Zhengbei Peijia, hoping that this old intersex man with a long family background could help everyone clear up their doubts.

    Bei Peijia put down his hands helplessly. This was the first time he heard that the earth revolves around the sun.

    "Zhao Hao, who is well versed in everyone's psychology, said: "Up to this point, you will definitely still say, how is this different from Xunzi's 'Theory of Heaven'? It's all just a hypothesis."

    The officials smiled and nodded, no.

    As Zhao Hao said, in their view, the so-called "solar system" is just an idea.  There is no essential difference from the 'Huntian Theory', 'Gaitian Theory', and 'Xuan Ye Theory'. They are all just hypotheses.

    "Hypothesis, if you believe it, believe it, if you don't believe it, throw it away."  So they didn't care too much, just treating it as a novel experience.

    "However, what I want to tell you is that this model is not imaginary, but is derived from detailed observation data and precise calculations."

    Then I heard Zhao Haoshi say in shock: "So based on this, we can calculate the time and observation direction of every solar and lunar eclipse, as well as Venus conjunct the moon, Yinghuo Shouxin and other celestial phenomena."

    "Can you calculate it accurately?" At this moment, Supervisor Bei finally couldn't help shouting: "You're bragging!"

    The censor who maintained order was about to scold him, but when he saw Mr. Xu Ge shook his head slightly, the censor obediently shut his mouth.

    The day before yesterday, Mr. Xu Ge called Mr. Bei to the cabinet to discuss the matter, and today he was asked to take the lead!

    "Is this strange?" Zhao Hao said with an arrogant look like "Idiot with such a question":

    "Astronomy has been called the study of celestial calculations since ancient times. Doesn't it rely on observation and calculation? Liu Hui's "Island Calculation Classic" of the Western Jin Dynasty has clearly written down the methods. Zu Chongzhi of the Southern and Northern Dynasties can accurately calculate wood, water  The orbits of the five planets, fire, gold, and earth in the sky and the time it takes to travel for one week, as well as the more accurate five-star conjunction period. Even Guo Shoujing of the previous dynasty could calculate the yellow-red intersection angle"

    "Speaking of Guo Shoujing, couldn't the "Time Calendar" of the previous dynasty be used to predict solar eclipses? It just lacks accuracy." As he said this, he looked at the Bei Supervisor with a strange look and said:

    "It's hard to imagine that a Qintian supervisor would actually ask such a question."

    ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? Bei¡¯s face turned red, Zhao Hao hit the spot, because this is the fatal flaw of the Ming Qin Tian¡¯s Prison.

    He knows that the "Time Calendar" can predict solar eclipses, but he can't understand it

    Because the mathematics of the Ming Dynasty is out of date!

    As I said before, in the middle of the Yuan Dynasty, China's world-leading mathematics declined sharply.

    Except for the reasons of cultural regression and neglect by scholars.  The popularity of the abacus during this period caused the ancient mathematical system based on calculations to fall apart. Four yuan, Tianyuan, Dayan Qiuyi, multiplication and square root were completely lost in this dynasty.

    Without these mathematical tools, Qin Tianjian could not understand the "Time Calendar" derived from Tianyuan Shu at all, and the solar and lunar eclipses they calculated based on the current "Tatong Calendar" were full of mistakes and had no reference value at all.  .

    So much so that Qintianjian is generally considered to be a pure astronomical observation institution.

    In the eyes of officials, their daily work was to look up at the sky, record abnormal celestial phenomena, then check and compare divination books, copy the books and submit them to the court.  There is no need to have a high level of knowledge, as long as you can read and write, you can do it.

    Supervisor Bei was very angry about this - at least compiling the imperial calendar every year is quite technical!

    ??~~

    Therefore, Supervisor Bei blushed for a while, and then he gritted his teeth and said to Zhao Hao: "Yes, I can't figure it out, but I believe that no one in the entire Ming Dynasty can figure it out!"

    "I can do it." Zhao Hao said with a faint smile: "And my disciples can do it too."

    "Then just forget it!" Supervisor Bei said with a smile: "If I can really figure it out, what if I worship you as my disciple on the spot?"

    "You are taking advantage of me." Zhao Hao started to show off.  "It's not that easy to ask me to be your teacher."

    ???????? Li Ge Lao and Chen Ge Lao are convinced that their young masters are still solving geometry problems at home

    "Zhao Hao,"??What kind of place is this?  !  Mr. Xiaoge finally couldn't help it and shouted: "Don't be so arrogant here!"  "

    "You are the one who is presumptuous, right, Mr. Xiaoge?" Zhao Hao glanced at him with a sneer and said, "Don't you know that it is rude to interrupt others?"

    "you!"

    "Quiet!" Seeing that the censor's mouth was stiff, Teng Xiang had no choice but to scold him: "Don't make any noise, keep talking."

    Zhao Hao then turned to Supervisor Bei and said, "For His Majesty's sake, I will make an exception and accept you as a registered disciple."

    "You figure it out first and then talk about it!" Supervisor Bei was dumbfounded, thinking that I, a high-ranking official of the fifth rank, was actually disliked by a little waiter.

    It is indeed true that there are many crazy people waiting for the imperial edict.

    "Okay, since your mathematical level is limited, I will teach you a simple algorithm." Zhao Hao cleared his throat and said loudly:

    "As we have just demonstrated, solar and lunar eclipses are caused by the movement of the sun, the earth, and the moon to special positions. The movement cycles and orbits of the earth around the sun and the moon around the earth are regular, so the sun  There must also be patterns in the occurrence of eclipses and lunar eclipses.¡±

    "The astronomers of the Han Dynasty called the earth's orbit the ecliptic and the moon's orbit the ecliptic. And they have discovered that the two are not on the same plane, but there is an intersection angle of five degrees and nine minutes between the yellow and the white." Then Zhao Hao pointed out  On the model, the orbits of the Earth and the Moon are:

    "Now, let's look at the conditions for a solar eclipse to occur - it can only occur on the first day of the new moon, and the sun and moon must be almost in a straight line."

    While talking, Yu Shenxing placed on the model the relative positions of the sun and the moon during the solar eclipse.

    "As you can see, when a solar eclipse occurs, both the sun and the moon must be near the intersection of yellow and white." Zhao Hao said, and Yu Shenxing pushed three small balls to rotate along the orbit:

    "Suppose that many days later, the sun and moon move to almost the same position, then a similar solar eclipse will be observed on the earth."

    The astronomy of the Ming Dynasty is indeed a mess. This was common knowledge in the Han Dynasty. Only Bei Jianzheng and his deputies could keep up. The eyes of the others were already distracted, just like you when they saw you here

    Seeing Supervisor Bei nodding his head, obviously understanding, Zhao Hao continued with some relief:

    "So as long as there is the time it takes for the sun to pass through the yellow and white intersections continuously, and the time it takes for the moon to pass through the yellow and white intersections twice in a row, then find the least common multiple of these two numbers and the number of days per month, which is the number of days needed to repeat it once!"

    "The average month is 29.53 days. A node month is 27.21 days. An eclipse year is 346.62 days."

    The data on node moons and eclipse years have been around since ancient times, and Bei Jianzheng could tell them casually.

    ¡°Obviously, the uncle is not just a man for a living.

    "Then can you count?" Zhao Hao asked eagerly.

    Supervisor Bei shook his head, tears almost coming down his face.

    "Okay, I'll teach you." Mr. Zhao was a good teacher after all, so he taught him step by step how to decompose prime factors.

    Who would have thought that the uncle would be able to do it as soon as he was taught, and he immediately started to write and count. After a while, he reported the number and said: "It should be six thousand five hundred and eighty-five and one-third days."

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