The Gan and Shi families have accumulated thousands of years of experience in astronomy and climatology. Even if we don’t count the time when Ji was surnamed in the past, just counting from the time when these two families produced the first astronomical work in human history, up to now
It's more than six hundred years old.
Over the past six hundred years, the two families have accumulated a large amount of information on astronomy, hydrology, and climatology.
After suffering several heavy blows from super-large-scale disastrous weather, the Gan and Shi families finally came to their senses - we wanted to create a large, accurate, dynamic and inheritable thing that integrates all the family's information and can continue.
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Of course, there is a very important point here. There is so much information left by the ancestors of these two families. Even if part of it is lost or damaged during the period, the number of bamboo slips is enough to crush a person to death.
So this group of people planned to sort it out, and in the process, the son of the Shi family brought Wan Zhen to the two families. After listening to the younger brother of the Shi family explain the astrology, he had a flash of inspiration and pieced together the magical operation of planet positioning.
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As I said before, Wan Zhen is a genius in the true sense. His spiritual talent for understanding all things is extremely effective in his hands. He only needs to know the beginning of many things and he can analyze a lot of them.
magical uses.
Combined with the messy knowledge he has mastered before, opening a new skill for you on the spot is just like playing. Although theoretically, the new skills created by Wan Zhen do not have anything developed by himself. His skills are all obtained from other people.
He picked up messy things, and then relied on his amazing ability to put them together to create something for himself.
However, you have to admit that Wan Zhen is really the god of patchwork. He can always piece together some messy things to create a set of incredible gadgets.
For example, I chatted with the son of the Shi family and learned about astrology and navigation. Soon after I learned it, I combined my knowledge of mathematics, astrology, navigation and clocks to create a planetary positioning technique.
For example, in the official history, Wan Zhen actually had never been to the Southern Kingdom, but he wrote "Nanzhou Foreign Objects" which is very accurate and has great reference, quotation and reference value.
For another example, Wan Zhen actually has four levels of smelting now, and he has also combined his knowledge of talents to create a talent smelting and transformation logic book, as well as an optimization of talent structure combinations, successfully allowing himself to keep up with the cavalry headquarters.
combat effectiveness.
Even after experiencing the war, I also learned some military command, and then combined with Chen Xi's modular concept, some things from Huangfu Song Cult, and the war experience of Xiliang Cavalry, I came up with a set of military command techniques that I can use without any problems.
Not to mention, commanding a legion is really no problem.
This guy is a real god, but he doesn't want to be an official, he doesn't want to have a family, and he doesn't feel like giving birth to a baby, so he wanders around the world day by day.
During the journey of thousands of miles, Wan Zhen also wrote a lot of useful things. This time, the two heads of the Gan and Shi families came together and read some of Wan Zhen's records before deciding to conduct astronomical and geodetic surveys in advance.
Chen Xi didn't know about these things, but since these two families wanted to do this, Chen Xi roughly knew how far the level of this group of people had developed.
"This project is not small." Chen Xi said with a very serious expression, "And since you want to test it, I'm afraid it won't be more than that. Let me tell you what you found first, and then I'll see how much investment you have."
Astronomical geodetic surveying requires a lot of manpower and material resources. The first astronomical geodetic survey was carried out during the reign of Emperor Xuanzong of the Tang Dynasty, and the manpower was not mentioned. The actual measured point was from 51st latitude north (Ulaanbaatar, Mongolia),
At the 18th degree north latitude (Vietnam), it exceeds the northern and southern land boundaries of China's current territory.
To be honest, this kind of actual measurement method was not feasible in the feudal era until the country was at its peak. Moreover, the territory was not large enough, there were not enough control samples, and there was no way to make it accurate.
And Chen Xi thought that this was indeed necessary. After all, the astronomical knowledge he mastered was not accurate in this era. The existence of precession and nutation caused some of the astronomical knowledge used by Chen Xi to be inaccurate.
Of course, the laws are the same, but the basic terms have changed. But to be honest, the basis has changed, and the results calculated by the laws can only be used as a reference.
However, the Han Dynasty rarely dealt with things that are jointly affected by precession and nutation, such as the true axis of rotation, the true celestial pole, the true celestial equator, the instantaneous true vernal equinox, etc.
One thing to say, these things have little impact on ordinary people.
So Chen Xi has always been able to muddle along, but looking at the current intentions of the Gan and Shi families, they need to solve these problems together. Think about it, if you want to accurately achieve atmospheric circulation, these things are necessary parameters.
After all, the true axis of rotation affects the position of the pole. This thing will shift under the combined action of the gravity of the sun and the moon and the motion of the earth. This is also the reason why the position of the pole moves over time.
This thing is related to the exact location of the concept point of north and south, and is an indispensable parameter for accurately constructing a dynamic planet.
Of course, this stuff should be put aside for now. In fact, as long as the precession and nutation are clear, these things can be calculated by hard calculation. The so-called precession is actually the time difference between the sidereal year and the tropical year.
The tropical year is simply and crudely, it means that the time it takes for the sun to pass through the vernal equinox twice is one year, while the sidereal year is the time it takes for the earth to make one revolution around the sun and come to the previous point again. The difference between these two times is
Precession.
Of course, this is a time concept. The real cause of precession is actually the change of the true axis of rotation above, and the change of the true axis of rotation is the joint result of the gravity of the sun and the moon and the movement of the earth.
The logic of nutation is similar to the logic of precession, but nutation is caused by changes in the distance between the earth and the moon. We have learned about gravity and the orbit of the earth and the moon, so it should not be a problem to understand the influence of the moon on the earth at its perigee and apogee.
This gravitational pull causes the Earth's rotation on the great circle of the star's orbit not to be completely smooth, but to have a peak and a trough, which is nutation.
These two things affect a lot of things at the same time, which is the basis that must be considered in astronomy.
Therefore, Chen Xi must understand how far the Gan and Shi families want to achieve. If it is only as high as the Tang Dynasty, Chen Xi will pay three to five hundred professionals and hundreds of millions of money. If he has realized that the gravity of the sun and the moon has a certain influence on the true axis of rotation,
influence, and consciously adjust the true axis of rotation to determine it together with the ends of the earth, then Chen Xi can invest more.
"The first is the issue of solar phenomena. There is a large amount of data in the family that can prove that the moment of solar eclipse and the eclipse phenomenon will be different depending on the observation location. The same is true for the length of solar shadow and the time of day and night of each solar term."
When Gan Bao saw Chen Xi asking, he knew that every word in the current answer was related to subsequent funds and manpower.
Of course, funds are not important. If you don't have money, you can go to other families to beg for help. Anyway, the Yuan family in Runan still has hundreds of gold bricks. If you grab them for funds, you will get scolded by the Yuan family at most, which is not a problem at all.
The real trouble is manpower. If Chen Xi agrees, the number of professionals who can be deployed will increase significantly. Immortals like Wan Zhen and Zhao Shuang can also be captured to work. This is very important to the Gan and Shi families.
"Well, this is a question of latitude and longitude. This is easier to handle. I can give you 200 million yuan to conduct actual measurements at different latitudes and the same longitude, and then calculate the length of the meridian based on the angle difference." Chen Xi nodded.
, this can be done by just paying money, and it is very meaningful.
As for why it is still called a meridian, it is because the child of the earthly branch represents true north and the noon represents true south. The original meaning of the meridian is the line from true south to true north. If you calculate this thing and combine it with the circumference of the earth, you will realize that the earth is an ellipse.
Sphere, and the ellipsoid thing has some characteristics. As long as you realize that the earth is an ellipsoid, many things will be inferred.
"Speaking of which, you don't talk about the connection between heaven and man. This is a solar eclipse, a bright sun, and you don't respect it at all." After Chen Xi finished speaking, he asked with a teasing tone.
"We have already calculated this. One degree of the meridian is about 111 kilometers." Shi Tao waved his hands and said. They had already calculated it by blowing other people's gold coins. "As for the induction of heaven and man, we don't do this kind of thing very much.
Tu Yihu is happy, it’s just a matter of deceiving others, but us? Oh, we have no money to deceive those who play with the telepathy of heaven and humans, and let them deceive others..."
Chen Xi had nothing to say after hearing this. He lowered his head and recalled the encyclopedia he had read. The difference between the data and this data was very small, so he understood that the Gan and Shi families already had a fairly in-depth understanding of this aspect.
"By the way, you have all calculated the length of the meridian, and you have followed Jiang Dong to the equator to calculate the length of the equator. Haven't you discovered the problem yet?" Chen Xi asked curiously.
"Isn't it really a true goal?" Gan Bao scratched his head and said with some discomfort. For someone with obsessive-compulsive disorder, it was really uncomfortable to miss such a goal.
"Co-authors, you know, you just don't want to accept it, right?" Chen Xi said with a smile. The earth is not a perfect sphere, but an ellipsoid. Although it is very close to being a perfect sphere, some things are almost not.
"Forget it, let's continue talking about the problems we found after reviewing the data." Gan Bao said with some discomfort, "The correct sphere is only one aspect of the problem. In fact, after having the atmospheric circulation map and planetary positioning as a reference, we compared
Ancient records actually discovered a lot of things, such as tides, precession, and the declination of the earth's poles."
"Well, the declination of the Earth's poles. You have discovered that the Earth's poles have shifted, right?" After Chen Xi pondered for a moment, he said with some thought, "In other words, you will have to measure the Earth's poles for a period of time.
The pole has shifted. How do you plan to test this thing? Where will it be tested?"
Shi Tao's mouth turned bitter when he heard this. He and Gan Bao lost the guessing game. Their family went to the Arctic Circle to measure the geographical poles and the geomagnetic poles. Although they had this awareness a long time ago, it would be fatal to actually measure them.
"At that time, I will lead the Shi family to the North Pole for actual testing." After suffering, Shi Tao must be upright and upright at this time.
"I remember that the Yong family seems to be in the polar circle. You can discuss with them and stay with the Yong family. There will be a court meeting this year, and the Yong family should be coming. Then you can discuss it." Chen Xi thought for a while and suggested.
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After all, if you want to test this, you can only go to the polar circle. Going back and forth to the polar circle and experiencing the polar night will also help these guys understand the realistic concept of the ecliptic plane.
As for the troublesome Yong family, even if they stay at home, they still need an astrology, climate and calendar family like Gan Shi. This kind of family stands at the top of almost all families in an agricultural society.
Despite its low reputation and low official position, official positions will be continuously assigned to this family, and there will be no political conflicts. As long as you do your own thing well, everything will be arranged from birth to death.
Therefore, even if the Yong family is staying at home, they still have to give face to this kind of family when they want to go on field trips there. After all, if they live with you for a period of time, they can help you write a local perpetual calendar, and then you can save a lot of money in farming in the future.
thing.
"We also considered the Yong family, but the Yong family didn't know what was going on and couldn't contact them. We planned to contact the Yuan family first. The Yuan family said that they also have a station in the north of the Ural Mountains near the North Pole, and they could let us first
Study there and provide us with protection." Shi Tao heard this and expressed his understanding. They had really considered the Yong family, but they could not find the Yong family.
"The Yuan family is fine too. Anyway, be careful, the Yuan family's sugar-coating offensive is very fierce." Chen Xi said casually.
"We also know this. We have supported five astronomicalists of the Yuan family before, and four of them got married and had children in Sizhao City." Gan Bao said helplessly, "In addition, when the major families left, the marriages
The daughter of our family has made it so that now there are less than 120 people in our family who can work, so I am really convinced."
Women can also work. These days, the internal blockade of family clan schools is not serious. In addition, due to the shortage of manpower, women will also be dragged into doing odd jobs. After a long period of exposure, most of the women from the Gan and Shi families have become
Hydroclimate research is still reliable. At the very least, it is no problem to record the data and make judgments on the table step by step.
In the early days, there were more than 200 people working in the Ganshi family, but now there are less than 120 left. They are either getting married, or other families are offering high prices and joining other families to fool around. Considering that some old men and women can no longer afford to go out in the wild
For inspection tasks, the manpower of the Gan and Shi families is further stretched.
In addition, the current territory of the Han Dynasty has increased significantly, and the newly occupied territories must at least produce a basic farming calendar, which has resulted in a much heavier workload for everyone. This is also the reason why the older generation has directly retired. They cannot stand it, they really can't.
Can't stand it any longer.
"Where are the new people we trained?" Chen Xi asked curiously. If I remember correctly, the Gan and Shi families have been aware of this problem since five years ago and have been constantly training new people. They have not shipped the book together, right?
"We have tried our best to recruit children under the age of ten, but most of the children we recruited have zero knowledge of astrology and climate." Gan Bao had nothing to say.
Chen Xi was helpless when he heard this. The children recruited these days, even if they are descendants of aristocratic families, are the ones who can understand the stars and climate.
"Forget it, let's continue talking about the astronomy and geodesy you want to do." Chen Xi sighed and said, there is no other way. If there is no newbie who can inherit it, we can only do it slowly. The popularization of this kind of basic knowledge really needs
time.
"We already know something about the precession, but the accuracy needs to be calculated, and we have also found evidence of the influence of the moon relative to the tides and planetary rotation from hundreds of years of data, but they all require precise measurements and calculations.
." Shi Tao said with admiration for his ancestors.
Again, some ancestors of the Gan family and Shi family did find that the record was illogical and manually modified it. However, there were also cases where they recorded it honestly and then said that what I recorded was like this and that the reality was illogical.
I think we may have made a mistake in our calculations. You latecomers will have time to figure it out again.
After more than 600 years, there are many people who manually modify and adjust data to ensure that there is not much difference with their own calculations. However, there are also many people who realize that there is a problem with their own calculation formulas, but cannot find the problem, but record it truthfully.
In this era, with the concept of the earth as a ball and atmospheric circulation, it is still possible to verify and compare many recorded data with each other and filter out the correct data.
Even if the filtering conditions are extremely harsh, the accuracy of the records must be ensured. After more than 600 years of archives, there are tens of thousands of records, and then they are verified and compared with each other. Under the concept of planet, many things that were originally ignored will naturally be
Picked out.
Concepts such as precession, nutation, geomagnetic poles, earth poles, ellipsoids, ecliptic angles, etc. have all been forcibly deduced from these data, and even the concept of gravity has been forcibly pulled out and added to it.
Although the constants have not been calculated, the concept has been introduced into it. The vacuum pendulum from the northern border to the equator is enough for Gan and Shi to calculate the range of gravity acceleration. These are very big improvements.
It's just that these people really can't figure out the thing about gravity. Lord Niu is indeed a true god to a certain extent. Fortunately, Chen Xi is not in a hurry.
After all, this group of people have deduced Kepler's three laws using the data of their ancestors. They seem to be, well, think about it carefully, they are still one Lord Cow away from the Lord Ox.
But it doesn't matter. If we can achieve this level, and also introduce the concept of gravity, sooner or later there will be a true god who will figure out the law of universal gravitation. For now, we still have to wait and see how the Gan and Shi families operate.
"Have you ever considered how long it takes to observe this thing?" Chen Xi asked with some curiosity.
"We estimate that the influence of moon phases and tides on the rotation of the earth will take one generation. The one in front..." Gan Bao looked at Chen Xi awkwardly. They didn't know how long it would take, but it must be a long time anyway.
"What about mathematical calculations?" Chen Xi looked at the two of them speechlessly.
Slip away, slipped away, the author is really useless, sigh