But Zhao Kuangyi still did not understand the importance of this instrument in Song Jiu's hand...

Guo Cheng sat down nervously.

Song Jiu asked: "Where are the two kings, Liu of Han, Sima of Jin, Yang of Sui, and Li of Tang of Tang?"

Among these surnames, although Yang of the Sui Dynasty is noble, he is also a surname of Wang. The establishment of the Sui Dynasty is too short, and Sima of the State was not short, but the Western Jin Dynasty was not long, and Sima of the Eastern Jin Dynasty and the gentry jointly governed the country, and with the combined surname, the influence was not far away. However, the influence of the remaining two surnames is not low. The Liu surname is not necessarily the bloodline of the Han Dynasty. Some Hu people also changed to the Liu surname, and the same is true for the Li surname. Like Li Cunxu, he was not a Han family, but changed to the Li family. Moreover, Li in the Li Tang Dynasty was not the most expensive, and the most expensive ones were Li Longxi and Li Zhaozhou. The five surnames and seven families became the same as the Tang Dynasty, but the descendants scattered everywhere are still there. But it is too easy to really find these descendants of the royal family. But who is looking for it is the real search.

Zhao Kuangyi said: "Song Jiu, you have something to say."

"It's related," Song Jiudao.

Starting from the sextant, Guo Cheng went to Lingnan and saw different shadows, he was thinking about one thing. The appearance of a compass, whether it was sailing or marching, was useful, but it was still not enough. For example, from Kaifeng to Caizhou, it was almost southbound, and there were many plains. With a compass, it was a road that was opened when you met the mountain and a bridge that was built when you met the water. You would not lose your direction when you went to Caizhou. However, when you went to the sea or Qizhou, Qizhou was theorized to be the south of Kaifeng. However, when you were separated by the Dabie Mountains, you had to take a detour and circle around a few times to know where the south was. If you didn’t ask the people, you might not know where the army was heading.

Therefore, he wanted to invent a more advanced instrument from this shadow to use it to identify directions. However, this was too difficult, so he thought of the movement of the earth and the angle of the sun.

Song Jiu only proposed that the sun is a star, and did not say more, so the reference object is still the sun. Guo Cheng thought about it and finally came up with a solution, using two mirrors, one is a fixed mirror that is transparent and reflects on the other, and the other is a moving movable mirror that arranges the projection of the sun into a straight line. Then through calculation, the north and south of this position, that is, the latitude.

But in actual implementation, there is a huge error.

At one point, he became confused and when he was released directly, he returned to the capital and told Song Jiu about this idea.

Song Jiu was not very clear about the sextant meter. The sextant in his previous life was also very complicated, but I knew some relevant principles and immediately found out the reasons for the error. First of all, it cannot be used on rainy days. Don’t talk about stars. Astronomy in this era is not so mature and has a heavy superstition. The reference object is still the sun, so this problem doesn’t matter. Does it rain every day?

The second is time. The measurement in the afternoon is the most accurate, but the understanding of longitude is not scientific at this time. For example, Mizhou noon is more than 40 minutes earlier than Kaifeng noon. This is fine. It is more accurate. The equipment for time researching in the workshop is still unsuccessful and the progress is not slow. It may be successful next year. That is the clock, but Song Jiu did not expect one thing. In the Song Dynasty, the original clock actually appeared, which was studied by Su Song, just a hundred years later.

However, this clock has made much progress than Susong's type, it is a real wall clock.

After Song Jiu pointed out some directions, he still handed it over to Guo Cheng for research and development, and even allocated some money as R&D capital, and named it Guo Chengyi.

After he finished speaking, Zhao Kuangyi was still confused.

Song Jiu said slowly: "Two Kings, I don't know much about other regions, but the JAC ships are docked many times at the wharf. I occasionally talk to them. In recent years, the country is peaceful and the JAC is rich. Many families have two, three and four sons. These children will start a family and start a career in more than ten years. If we talk about martial arts, our dynasty may not be as good as the Tang Dynasty, but in terms of internal governance, the Tang Dynasty is far inferior to our dynasty. From Zhenguan to Tianbao, the population quickly changed from two million households to more than nine million households. But our dynasty's territory is far away.

Not as good as the Tang Dynasty, I have calculated that no matter how it is cultivated, our dynasty will take back the Wu, Yue, Tang and Northern Han, and the arable land will not exceed nine million hectares. At least half of the orchards, vegetable gardens, mulberry, hemp and cotton. The remaining half of the land is produced. If it is not a high-yield land, the yield of one mu of land is barely two stones, and even if it is a competition, it is limited. It plans to evolve seeds and farming. This half of the land grains will also deduct the miscellaneous grains used for livestock and poultry, and the grains used for winemaking. How many people will it support? Thirty million households will reach the sky."

"How is it possible for 30 million households?"

"Two kings, I only talk about Tianbao. If there was no Anshi Rebellion, the population increase in the Tang Dynasty would take many years to reach 30 million households. Moreover, because the Tang Dynasty rented mediocre and taxes were mostly calculated based on the Dingkou, the phenomenon of hidden households was more serious than that of our dynasty. To say nine million households, there were actually more than 15 million households. Besides, our dynasty."

Don’t talk about the role that Song Jiu’s self-confidence promotes the Song Dynasty.

In history, the Song Dynasty had reached more than 20 million households, and the arable land area was more than 5 million hectares during the reign of Emperor Zhenzong of Song Dynasty. However, because the Song Dynasty's land tax was calculated and the hidden households were also hidden, it was actually close to 7 million hectares at that time. Xining reformed the situation and reclaimed more arable land, and the household registration list may be less than 3 million hectares, but it may actually reach more than 8 million hectares. This is a terrible number. When the Song Dynasty was at its peak, Tong Guan opened the border and reached the border province, and with most of Qinghai, it also occupied many Western Xia territory. Secondly, shortly after the Northern Han Dynasty was captured, there were still Song garrisons and garrisons in Yinchuan and North and South Hetao. Although it was mainly dependent, it could be said that it was the territory of the Song Dynasty. However, the two were not long, and the real area was less than 3 million square kilometers. More than 8 million hectares reached 150,000 square kilometers, and the proportion of arable land development reached just over 20%!

But this is the era of low productivity.

In fact, the merger was serious in the late Northern Song Dynasty. Although many people were very rich, a rich man from Shandong took out millions of money to do good deeds, exempting several states from debts and all taxes that year, the rich and poor were seriously uneven. In fact, there was no Jin invasion south, and there was already the beginning of a large-scale peasant uprising.

Can't raise so many people!

Perhaps 30 million households are an astronomical figure for Zhao Kuangyi, but it is not difficult to understand compared with the national policy of Tianbao.

"No wonder Wei Zheng said it is even more difficult to defend the country..."

"The two kings are not difficult, but we keep staring at the country, staring at the past, and asking if the past is really that good? No. For example, Dayu controlled the flood, and Yangzhou was not developed. It was a land of water and water, so it was ranked the lowest in the Jiuzhou. Yangzhou was full of war in our dynasty, which is the case. Who dares to list it as the lowest in the Jiuzhou?"

"Tell me, what is the connection with this little thing?"

Song Jiu continued to explain.

He knew a little about sextant, but he didn't think of it at all. Guo Cheng was confused, but Song Jiu saw its meaning. Guo Cheng wanted to use it on land, and Song Jiu immediately thought of sextant and eight-pointer. In fact, it was a more backward eight-pointer.

The first thing to measure is time. The workshop is studying time, not hourglass and water leakage, which is a real clock. If the error is not large, the time in Kaifeng can be fixed. The longitude is changing and the clock will not change. Then it is very easy to measure longitude. For example, from Mizhou to Kaifeng to measure noon through shadows, and then look at the clock, they will immediately measure their different longitudes. If the straight line distance can be measured, or even the gap between the length and the longitude can be calculated approximately.

The difficulty is latitude. Once Guo Chengyi successfully researches, latitude will not be a problem.

This is of great significance. First of all, there will be earth-shaking changes in the map. The map is no longer the kind of terrain that makes people sad and infuriating before.

The second is navigation.

Not to mention other sailings, everyone is familiar with them, but the yamen all know that these ships were built by the capital. They were launched in the water for more than 70 ships and sailed nearly 300 times. The sea was too dangerous. The two ships were sunk by wind and waves. This was the fleet, and some people rescued some of them on the rafts made by Song Jiu. Another ship was blown away from the route and was unknown where they went. It was not just one of them, but the Gao family's ship was blown to the mouth of the Qiantang River, and the side sail was not enough. The north wind was strong, and it was only one day, and it sailed westward to Hangzhou Bay. This was with a compass, otherwise it would become Li Bai's Japanese friend and could blow to Guangzhou.

It is unknown whether the ship blew to a strange place or sank, but it has never returned since then.

The blow was heavy, helpless.

It is also very miserable if you blow to an unfamiliar place, such as when you blow to an Oceania island, there is land or someone else. But can you ask the natives wearing leaves, Harrow, fellow villagers, where is it here? Don’t say you don’t understand it, you can understand it, and they know where. If you lose your direction, don’t want to go home...

However, by measuring the longitude of the clock error and the length of the shadow, Guo Chengyi measured the latitude and when he arrived in Antarctica, he measured the latitude and longitude. It was not too accurate or accurate, so he could find out the way home. From then on, the vast sea would never become a super large maze again.

"You mean if your Zhong was successful in researching it, and with this Guo Chengyi, you can calculate the length of the earth?"

"The two kings, the latitude is not the meaning of the classical meaning. The earth is round, and the center latitude is not in our dynasty. It may be south of the city. The latitude calculated from our dynasty is not the length of the earth. Only the longitude length is about the same, but it is not easy to calculate. The only thing that can be calculated is the length of the latitude line in which the capital is located. Including Haizhou and Longzhou, it is basically near this line, but it is definitely not the maximum latitude length of the earth, and it can only reach about half. If the error is added, the huge difference will be even greater."

"That's good." Zhao Kuangyi was obviously interested. The boundless world is the concept of ancient and modern times. Now it is good to estimate the length of the earth. After taking two steps, he asked again: "What does this have to do with population, Han, Liu, Tang and Li?"

"The land has loading, that is, the load capacity on the ground is limited. Guo Chengyi's appearance is conducive to navigation. I won't mention how much income can navigation bring to the country, but there is another advantage..." Song Jiu found a pen and drew a map. He did not draw North and South America, but it was too far away. He only drew maps of Oceania and the South China Sea islands. Some countries had contacted the Song Dynasty, such as Sanfoqi. These island states had begun to have initial civilizations, while some were still very backward.

It is difficult to get around the South China Sea. Like Ma Yi in the Philippines, she was inspired by China and began to have some civilizations, but this civilization is still very backward. Song Jiu meant that the population increased to a certain extent, and organized tenant farmers who could not survive and immigrated to overseas islands through some incentive means. But there is no rush now. However, after the matter of the Southern Tang and Northern Han was settled, some bridgeheads could be organized overseas. Then select some children from the royal family and some descendants of heroes to immigrate on a large scale, and then govern overseas.

"Not appropriate, is it still a member of the Song Dynasty?"

"The two kings, the Tang Dynasty prohibited the people from going abroad, and even did not allow them to go to the custody areas. Where are the Tang Lis there now? After our founding, our royal family did not have many royal family members, but in the future, how can the country be resettled? They are overseas, no matter how many people they have in their hands, they will not reach the number of China under the land. Besides, how can they threaten the Central Plains? They do not threaten the Central Plains, and they are lush branches and leaves. They are descendants of the Zhao family. Let me dare to say, how long can our dynasty stand for a thousand years?"

Zhao Kuangyi was a little frustrated. Don’t say that if one thousand years can have a 500 or 600 years, it will be considered a long-lived dynasty.

Long live, can you take it seriously?

"Although our dynasty did not have a great ideal... Fortunately, Zhou Gao, Meng and Liu Chai were either present or not, and their descendants were still present. Can other dynasties do it? But with the royal family on the overseas side, no matter who it is, the royal family will survive. This is one of them. There are many large countries in this world, and they are not of our race, and their hearts will be different. If the Han people migrate widely, they will be like stars and moon guarding the country and this civilization. From then on, no matter what the country has, there will be an additional spark of civilization."

Zhao Kuangyi pondered.

But after all, what Song Jiu values ​​is the significance of navigation. Even if there is no Jin people invading the south in the Northern Song Dynasty in the future, or under his leadership, it is enough to withstand the Jin people invading the south, and the population will inevitably explode to a terrible number. Immigration to overseas will be at most transported to alleviate domestic pressure. As for the stars raising the moon, don’t expect it. Cohesion makes him too disappointed.

Zhao Kuangyi thought for a while and said, "Take it with us and we will enter the palace."

"I just came out of the palace when I entered the palace."

"What's wrong? Let's go to the palace again."

Zhao Kuangyi brought them to the palace. Zhao Kuangyin was suspicious at first. Zhao Kuangyi explained: "Emperor brother, Liu Yu once castrated two servants sent by Song Jiu and the Pan family to Guangzhou. The Pan family's brothers had not yet lost their hatred, so he sent a little girl to trick Liu Yu to go to the Hezhou Shundian to gamble, owing a huge debt, and then asked for it. Liu Yu could not repay it. Pan Weide went up and grabbed him and beat him. Liu Yu's arms were sold. His servant went to Kaifeng Prefecture to sue. I beat Pan Weide fifty times and was about to report to the emperor's brother, how to deal with it. This kid came to plead for mercy and brought the students to bewitch me with this matter."

My eldest brother did this, and cold sweat broke out on Song Jiu's forehead.

Zhao Kuangyi continued: "Song Jiu, please re-interpret it."

Song Jiu had to repeat it all in a few words.

Zhao Kuangyi said: "Emperor Brother, if he can do it, I am willing to be the first to go overseas and protect the country and country of Song for the emperor."
Chapter completed!