[Sudden addition, and there will still be three more later, not surprised, not surprised,]

"It's too real, it's too outrageous, this primordial heavenly king must be a great talent who has only one in four thousand years, and he actually compiled these astronomical and meteorological data so accurately and properly, it's incredible!" Wei Zhonghua, who was in the data room, continued to calculate while constantly sighing.

He has been in this data room for nearly half a month, in this half a month, it has more carefully picked up all the content about astronomy and meteorology in the entire "General History of the Three Kingdoms" and "General History of the Western Han Dynasty", and then made a meteorological model for verification, and found that the whole model is extremely accurate and breathtaking, as if there really exists a world called Huaxia, and the time of the Eastern and Western Han Dynasty for more than 400 years.

Unlike Xiuyan, who directly uses a super quantum computer to perform calculations, Wei Zhonghua does not even have a decent computer, so he can only rely on an old computer with a history of more than 60 years in the data room to assist, and at the same time use paper and pen to undertake the main calculation work, which completes the construction of the meteorological model.

"By the way, according to this calculated model, about 120 years after the first lunar calendar, the climate of the entire Chinese world will change and enter the second cold period. Then there will be many abnormalities in the climate during this time period, I see, it seems to be the period of Emperor Xuan of the Han Dynasty in the general history of the Western Han Dynasty! Wei Zhonghua muttered that, according to his research, there have been two warm periods and two cold periods throughout the history of China, judging from the time when there were climate records in the general history of the Western Han Dynasty.

The first warm period, about 2000-1000 BC, that is, the Xia and Shang periods, during this period, the climate of the entire Chinese region was very warm, because the information said that there were a large number of broad-leaved forests near the capital of the Shang Dynasty at that time, which was a tree that could only grow in a warm climate.

Then there will be the first cold period, between 900 and 800 BC, although it only lasted for 100 years, the climate during these 100 years was extremely cold, and there is even a record of the entire Yangtze River completely frozen in this book.

After that, from 800 BC to about 120 years ago, it was the second warm period, during which the temperature of the entire Chinese region began to rise again, so that the climate in Xiqi became pleasant, and the entire northern Shaanxi Plain became the most fertile land in China.

After the end of the second warm period, the second cold period was naturally ushered in, and this cold period lasted for nearly 600 years, and the history of the Han Dynasty that Wei Zhonghua has learned about is also in this period of cold period, and all the historical materials about the climate have ended here.

However, since the model has been made, Wei Zhonghua naturally followed the model to predict, and finally concluded that the second cold period will last for about 600 years, and will probably end around 700 years after the beginning of the Yuan Dynasty.

After that, China will enter the third warm period, which will last for about 400 years, until the end of about 1100 yuan, and then enter the third cold period.

The third cold period lasts for 200 years, that is, around 1100-1300 A.D., followed by the fourth warm period.

The calculation of the fourth warm period is not so accurate, Wei Zhonghua estimates that it is about 200~300 years, and the latest will end in 1600 Yuan Yuan

After that, the fourth cold period will last for about 500 years, until the end of the cold period around 2100 Yuan, and China will enter a warm period again.

After Wei Zhonghua came up with such an eight-cycle change in climate, he didn't think about anything more, but from the perspective of later generations, these eight-cycle changes are actually closely related to the history and civilization of China.

For example, the first warm period was 2000-1000 BC, which was the time when the Xia and Shang were prosperous, and the population of the entire China increased greatly during these two dynasties, and the Shang Dynasty was also established during this period.

And when the first cold period began, because this cold period was only about 100 years, there was no dynastic change, but the Shang Dynasty's national strength suffered a serious loss, and with the second warm period re-advent, Xiqi, which took the lead in recovering the temperature, succeeded in cutting down the Shang and established the Zhou Dynasty.

This warm period lasted for more than 900 years, during which China entered the era of the Spring and Autumn Period and the Warring States Period, and the Spring and Autumn Period and the Warring States Period also became a period of germination of various ideas and systems in Chinese history, as well as a period of population explosion.

And I want to have a large number of people who can be freed up for all kinds of philosophical reflections at the same time that the population is exploding, and there are still a large number of dead princes fighting chaotically. As a result, the population is still rising, which means that during this period, agriculture was very developed, and at least the agricultural output could meet the needs of the current population, and there was a large surplus, and only in this way could we feed so many idle scholars when so many strong laborers died.

According to historical records, it was during this period that the Chinese civilization began to expand rapidly, from the original Central Plains, to the successive feudal vassal states, and finally to the west and the Qin state, the south and the Yue country, the east and the Qi state, and the north and the Yan state, basically constructing the core territorial territory of China, which are the results of the expansion of the second warm period.

The second cold period after that was actually the period of the Three Kingdoms of the Eastern Han Dynasty and the Five Hu Chaohua. During this period, agricultural conditions in the entire North were getting worse and worse due to climate change, so the food production in the North became less and less, forcing many people to move south, because the South was warmer and could grow a lot of food.

The most obvious evidence is that during the Three Kingdoms period, Wu was able to achieve a three-legged position by virtue of the south, which was unimaginable before the Eastern Han Dynasty, after all, whether it was population or food, the south was absolutely unable to compete with the north.

In the period of Wuhu Chaohua, the south ushered in a real period of great development, more and more people were forced to move south, and the poor living conditions in the north also made the wind of martial arts flourish, so in the end it was the strong army of the north that conquered the south, and finally the Sui Dynasty dominated the world.

With the unification of the Sui Dynasty, the third warm period gift package has also arrived. It's a pity that the fate of the Sui Dynasty was not good, and this only lasted for a few decades before the gift package was handed over to the Tang Dynasty, and the reign of the Tang Dynasty almost included the entire Third Warm Period, building a huge rule and territory belonging to the Tang Dynasty.

It was not until the beginning of the third cold period that the land of the Tang Dynasty could not support more peasants, and the grain began to be seriously insufficient, so the new dynastic cycle law began.

The third cold period lasted for a long time, and basically the entire Song Dynasty was in this period, but the Song Dynasty was more fortunate in that he lost the coldest region of the Sixteen Prefectures of Yanyun, and the northern region in his hands was the Central Plains, where the climate was still relatively humid.

In this way, the Song Dynasty did not need to carry the hapless population of the Sixteen Prefectures of Yanyun who would only consume more food, and the high development of the south was able to continuously transport more food to the north, thus helping the Song Dynasty maintain its rule.

This also led to the extremely prosperous port transportation of Kaifeng Province, and the millions of people in the entire Kaifeng Province all relied on the transportation from the south to maintain. This also led to the defense of Kaifeng Mansion being very difficult, and there were a large number of waterways that could directly attack the interior of the city, which indirectly led to the demise of the Northern Song Dynasty.

At the same time, this is also the reason why the Song Dynasty lost more than half of its territory, and after the Northern Song Dynasty became the Southern Song Dynasty, the economy was more prosperous than before, because the Song Dynasty lost its burden to the Jin State.

The unlucky Liao State and the Jin State have more burdens on their bodies, but they have lost the courage of their ancestors, so they can only continue to exploit the peasants in their own land, and eventually lead to their own end.

(End of chapter)