The Gan and Shi families have accumulated thousands of years of accumulation in astronomy and climate. Even if we don’t count the time before the Ji family, it has been more than 600 years since these two families created the first astronomy work in human history.

Over the past six hundred years, the two families have accumulated a large amount of materials on astronomy, hydrology and climatology.

After several heavy hammers in a massively large-scale disaster climate, the Ganshi and the two families finally woke up - we need to create a large and accurate, integrate all the information in the family, and continue the dynamic and inheritable thing.

Of course, there is a very important point here. The ancestors of these two families left too much information. Even if they were lost during the period and damaged some of them, the number of bamboo slips was enough to crush people to death.

So this group of people planned to sort them out. Then, during this process, the Shi family's kid brought Wan Zhen to the two families and listened to the Shi family's little brother explaining the astrological signs, and then a flash of inspiration made up the magical operation of planetary positioning techniques.

As I said, Wan Zhen is a true genius. The effect that the spiritual talent of all things can be exerted in his hands is very amazing. He only needs to know the beginning of many things to analyze a lot of magical uses.

Combined with the messy knowledge I had mastered before, it would be the same as playing for you on the spot. Although there is no one developed by yourself in the new skills that tens of thousands of times have been opened, his skills are all messy things picked up from others, and then rely on his amazing piece of tricking together to create the goods.

However, you have to admit that Wan Zhen is really the god of the patchwork world. He can always piece together some messy things into a set of very amazing things.

For example, chatting with the Shi family's boys and learning astrology and HNA. Shortly after learning, he developed planetary positioning techniques based on his own mathematical knowledge, astrology knowledge, HNA and clock.

For example, in official history, Wan Zhen has never been to the South Country, but he wrote it very correctly, with reference, citation and reference value.

For example, Wan Zhen has actually had the fourth level of melting, and he also combined his understanding of talent to create a book on talent smelting and transformation logic, as well as the optimization of talent structure combination, successfully keeping up with the combat power of the Iron Cavalry Headquarters.

Even after experiencing war, he learned some military command, and combined with Chen Xi's modular concept, some things taught by Huangfu Song, and the war experience of the Western Liang Iron Cavalry, he developed a set of military command techniques that are not a problem for himself. Not to mention anything else, it is really no problem to command a legion.

This guy is a real god, but this guy neither wants to be an official nor a family, nor does he feel like he wants to give birth to a baby, and he wanders around the world every day.

During the journey of thousands of miles, Wan Zhen also wrote a lot of useful things. This time, the two heads of Gan Shi came together and read some of Wan Zhen's records before they decided to conduct astronomical and geodetic measurements in advance.

Chen Xi didn't know about these things, but the two families asked to do this, so Chen Xi roughly knew how well the level of this group of people had developed.

"This project is not small." Chen Xi said with a serious expression, "And since you want to test it, there are probably more than a few things. Let's talk about what you have discovered first, and I'll see how much I invest."

There are not many manpower and material resources required to measure astronomical geodes. During the reign of Emperor Xuanzong of Tang Dynasty, no manpower was mentioned. The actual measurement point alone ranged from 51 degrees north latitude (Ulaanbaatar, Mongolia) to 18 degrees north latitude (Vietnam), which exceeded China's current territory north and south land territory.

To be honest, this kind of actual measurement method could not be afforded until the country was prosperous in the feudal era, and the territory was not large enough, there were not enough comparison samples, and there were no accurate calculations.

Chen Xi thought that there was indeed a need to do this. After all, the astronomical knowledge he mastered was actually not accurate in this era. The existence of precession and Zhang Dong led to the fact that some of the astronomical knowledge used by Chen Xi were actually incorrect.

Of course, the laws are consistent, but the basic terms have changed. But to be honest, the basics have changed, and the results calculated by the laws can only be used as a reference.

However, before the Han Dynasty rarely involved things such as the true rotation axis, the true celestial pole, the true celestial equator, the instantaneous true vernal equinox, etc. that were influenced by precession and Zhangdong.

To be honest, these things have no effect on ordinary people.

So Chen Xi had to just pass by, but judging from the meaning of the two heads of Ganshi families, this is to solve these problems together. Think about it, if you want to accurately carry out atmospheric circulation, these things are necessary parameters.

After all, the true rotation axis affects the position of the pole. This thing will cause deviation under the combined action of the gravity of the sun and the moon and the movement of the earth, which is also the reason why the position of the pole will move over time.

This thing is related to the accurate position of the concept point of the north and south, and is an indispensable parameter for accurately constructing dynamic planets.

Of course, this thing is thrown aside first. In fact, as long as you understand the precession and Zhang Dong, these things can be calculated by force. The so-called precession is actually the time difference between the stellar year and the return year.

The return year is simple and rough, which means that the time it takes for the sun to pass through the vernal equinox twice is one year, while the stellar year is the time it takes for the earth to circle around the sun and come to the previous point again. The difference between these two times is the precession.

Of course this is a concept of time. The real reason for the precession is actually the change of the true rotation axis above. The change of the true rotation axis is the common result of the gravity of the sun and the moon and the earth's movement.

The logic of Zhangdong is similar to that of the precession, but Zhangdong is caused by the change of the distance between the earth and the moon. He has learned all kinds of gravity and also knows the orbits of the earth and the moon. Therefore, it should not be a problem to understand the impact of the moon on the earth in perigee and apogees.

This gravitational pulling leads to the rotation of the earth on the large circle of the star orbit not being completely smooth, but has a peak and a trough, which is the chapter.

These two things affect a lot of things at the same time, and are the basis for astronomy.

Therefore, Chen Xi must understand what extent the Gan and Shi families want to do. If it is only at the level of the Tang Dynasty, Chen Xi will give three or five hundred professionals and hundreds of millions of dollars. If he has realized the impact of the gravity of the sun and the moon on the true rotation axis, and consciously adjusts the true rotation axis, and connects the earth pole to determine it, then Chen Xi can invest more points.

"First of all, it is the problem of the sun and the phenomenon. There is a lot of data in the family that can prove that the observation locations are different, and the time of the solar eclipse occurs and the foetus seen will be different. The length of the sun shadow and the day and night divisions of each solar term are the same." Gan Bao saw Chen Xi asking, and then he knew that every word he answered currently relate to subsequent funds and manpower.

Of course, the funds are not important. If you don’t have money, you can go to other families to beg for alms. Anyway, the Yuan family’s gold bricks still have hundreds of dollars. If you grab them for the funds, you can only get scolded by the Yuan family for a few words. It’s not a problem at all.

The real trouble is manpower. If Chen Xi agrees, the number of professional personnel that can be allocated will increase significantly. For example, immortals like Wan Zhen and Zhao Shuang can also be captured and worked, which is very important for the Gan and Shi families.

"Well, this is a problem of latitude and longitude. This is easier to do. I can give you 200 million yuan to test the same longitude at different latitudes, and then calculate the length of the meridian based on the angle difference." Chen Xi nodded. This can be done by paying for it, and it is very meaningful.

As for why it is still called meridian, because the Zi of the Earthly Branch represents the north and Wu represents the south. The original meaning of the meridian is the line from the south to the north. After calculating this thing, you will realize that the earth is an ellipsoid based on the circumference of the earth. The ellipsoid has some characteristics. As long as you realize that the earth is an ellipsoid, many things will be inferred.

"By the way, you don't talk about the response of heaven and man. This is a solar eclipse. You don't respect the glorious sun at all." Chen Xi said, asking in a teasing tone.

"We have calculated this. The meridian is about 111 kilometers at one point." Shi Tao waved his hand and said, they had already calculated the gold coins of other people. "As for the heavenly and man, we don't play much, we can just try to cheat others, just cheat us? Oh, we have no money to cheat those who play the heavenly and man, let them cheat others..."

Chen Xi had nothing to say when he heard this. He lowered his head and recalled the encyclopedia he had read. The difference between the data was very small, so he understood that the Ganshi and the two families had already had a very in-depth understanding of this aspect.

"By the way, you all calculated the length of the meridian, and followed Jiangdong to the equator and calculated the length of the equator. Haven't you found any problems yet?" Chen Xi asked curiously.

"Isn't it true that it's not a regular ball?" Gan Bao said with some discomfort, as for obsessive-compulsive disorder, it's really uncomfortable to have such a big shot.

"You know, you just don't want to accept it, right?" Chen Xi said with a smile. The earth is not a regular ball, but an ellipsoid. Although it is very close to the regular ball, some things are almost not.

"Forget it, let's continue talking about the problems we found after reading the data." Gan Bao said with some discomfort. "The positive ball is just a problem. In fact, after we have referenced the atmospheric circulation map and planetary positioning techniques, we have actually discovered a lot of things based on ancient records, such as tides, precessions, and declining angles of the earth's poles."

"Well, the deflection angle of the earth pole, you have already discovered that the earth pole has shifted, right?" Chen Xi pondered for a while, and said with some thoughts, "That is to say, you will be measuring the deflection of the earth pole for a period of time. By the way, how do you plan to measure this thing? Where can you test it?"

Shi Tao heard this and the corners of his mouth were bitter. He and Gan Bao lost rock-paper-scissors. Their family went out to measure the geographical poles and geomagnetic poles in the Arctic Circle. Although they had this awareness a long time ago, it would be very fatal if they really wanted to test it.

"At that time, I will lead the Shi family to the North Pole for actual testing." The hardship is over, but at this time Shi Tao must be righteous.

"I remember that the Yong family seems to be in the Ji circle. You can discuss it with them and live with the Yong family. It just so happens that the grand ceremony will be held this year. The Yong family should come. You can discuss it at that time." Chen Xi thought about it and suggested.

After all, if you want to test this, you can only go to the Jiquan. Speaking of going to the Jiquan and feeling the Jixiao will also help these guys understand the realistic concept of the zodiac.

As for trouble with the Yong family, even if you are squatting at home, you still need astrological and climate calendar family like Ganshi. This kind of family stands at the top of almost all families in the agricultural society.

Although you have little reputation and low official positions, official positions will be arranged continuously for this family, and there will be no political conflicts. As long as you do your own things well, you will be arranged from life to death.

Therefore, even if the Yong family is squatting at home, they have to give face if they want to go on site for such a family. After all, people live with you for a while and write a local perpetual calendar for you, so that they can save a lot of trouble in farming in the future.

"We also considered the Yong family, but the Yong family didn't know what the situation was and could not contact us. We planned to contact the Yuan family first. The Yuan family said that they also had a stationary point in the northern part of the Ural Mountains near the Arctic, so that we could study there first and provide us with protection." Shi Tao said that he understood that they had really considered the Yong family, but could not find the Yong family.

"The Yuan family is OK, anyway, be careful, the Yuan family's sugar-coated offensive is very fierce." Chen Xi said casually.

"We also know that we have supported the five Yuan family's celestial phenomena before, and four of them got married and had children in Sizhao City." Gan Bao said helplessly, "In addition, when the major families left, they married the daughter of our family. Now, less than 12 people can work in our two families, which is really convinced."

Women are also able to work. The internal blockade of family education is not serious these days. In addition, there is insufficient staff, women will be taken to do odd jobs. Under the long-term influence of the eyes, most women from the Ganshi family are reliable in hydrological and climate research. At least they can record data and make a step-by-step judgment on the table.

Earlier, the Ganshi families had about 200 jobs, but now there are less than 120 left. Either they get married or other families offer high prices, and they join other families to mess around. Considering that some old men and wives are no longer able to undertake outdoor inspection tasks, the staff of the Ganshi families are even more difficult.

In addition, the current territory of the Han Dynasty has increased significantly, and at least a basic farming calendar is needed to produce a new occupied land, which has led to a lot of workload for everyone. This is also the reason why the older generation directly retired. It can't stand it, it really can't stand it.

"Where are the new people trained?" Chen Xi asked curiously. If you remember correctly, the Ganshi family had realized this problem since five years ago and kept cultivating new people. They had not shipped together, right?

"We have tried our best to recruit children under the age of ten, but most of the children we recruit have zero understanding of astrology and climate." Gan Bao had nothing to say.

Chen Xi was helpless when he heard this. Even if the children he has attracted these days are descendants of aristocratic families, it is a damn thing that can have a sense of astrology and climate.

"Forget it, let's continue to say that you are going to do the astronomical geodetic measurement." Chen Xi sighed and said, "There is no other way. If there is no newbie to inherit it, then we can only do it slowly. This kind of basic knowledge is really needed to popularize it.

"We have already understood the precession, but the accuracy needs to be calculated. Moreover, we have also found evidence from the data over the past few hundred years, but all require accurate measurement and calculation." Shi Tao said with admiration for his ancestors.

As I said, some ancestors of the Gan family and Shi family did have the situation where they manually modify and adjust the record when they found that the record was illogical, but there were also honest records. Then they said that what I recorded was like this, the reality was illogical. I think we might have calculated something wrong. You later generations have time to calculate it.

Over the past six hundred years, there have been many people who have manually modified and adjusted the data to ensure that there is not much difference between them and their own calculations. However, they realize that there are problems with their own calculation formulas, but they cannot find the problem, but they have also recorded many truthfully.

In this era, with the earth being a ball and the concept of atmospheric circulation, many recorded data can be verified and compared with each other, and the correct data can be filtered out.

Even if the screening conditions are extremely harsh, the correctness of the records must be ensured. After more than 600 years of archives, there are still tens of thousands of them. Then they are verified and compared with each other. Under the concept of planets, many things that were originally ignored are naturally selected.

The concepts of precession, zhangdong, geomagnetic poles, earth poles, ellipsoids, zodiac angles, etc. have been forcibly reversed by these data, and even the concept of gravity has been forcibly pulled out and filled into it.

Although the constant has not been calculated, the concept has been introduced into it. The vacuum pendulum from the northern border to the equator is enough for the Ganshi and the two families to calculate the range of gravity acceleration, which are all very great progress.

But this group of people really can't figure out the gravity thing. To some extent, Mr. Niu is indeed a true god. Fortunately, Chen Xi is not in a hurry.

After all, this group of people had already introduced Kepler's three laws with the information of their ancestors. It seemed that they were still one less than that of the King Niu.

But it doesn't matter. If you can achieve this level, and also introduce the concept of gravity, sooner or later, the true god will come up with the law of universal gravitation. Now, we can first look at the operations of the Gan and Shi families.

"Have you ever considered how long it takes to observe this thing?" Chen Xi asked with some curiosity.

"We probably need a generation of people to have the impact of the moon phase tide on the rotation of the earth, the one in front..." Gan Bao looked at Chen Xi awkwardly. They didn't know how long it would take, but it must be very long anyway.

"Where is mathematical calculation?" Chen Xi looked at the two of them speechlessly.
Chapter completed!