"The sudden drop in temperature and the huge temperature difference between day and night made it impossible for the Mongols to survive, so the Mongols had to go south, and they could only go south!" Zhu Gaochi muttered.

"I see, I see."

Xia Yuanji's gaze was a little complicated, originally, he just thought that Jiang Shi understood politics and economics, and he could also make fertilizer elixir, but he never thought that Jiang Shi was an all-rounder!

A true all-rounder, he knows everything about astronomy, geography, history, politics and economy.

If Jiang Xinghuo told him that this was just a basic education that everyone would popularize in the future, and all ordinary people's children would learn it after more than ten years, I don't know if Xia Yuanji would be speechless.

And at this time, Zhang Yuchu and Zhang Tianshi's mood was also very complicated.

If at the beginning, Zhang Tianshi felt that Jiang Xinghuo's proposal that "the Xiaoice River period will lead to the demise of Daming" was alarmist and deliberately unstoppable.

Then, with the deepening of Jiang Xinghuo's lectures, he took them into the history of China from the beginning, reviewed the precipitation line movement caused by temperature, and the impact of precipitation line movement on the Northern and Southern Dynasties, Sui and Tang Dynasties, Tubo, and Western Regions.

Zhang Yuchu had to admit that the temperature does have an impact on the form of a country.

After all, temperature really affects food production, which in turn affects population, tax revenue, and national stability.

But even when it came to the demise of Loulan, Zhang Yuchu didn't have a moving look.

But, but.

When Jiang Xinghuo put forward the concept of "specific heat capacity" and explained the situation completely different from his cognition, Zhang Yuchu suddenly remembered something.

- Feng Shui!

This is too similar to Feng Shui!

In other words, isn't the so-called finding the dragon and fixing the pulse, smelling the wind and looking at the water?

But Feng Shui has been passed down for thousands of years, and no matter who wrote the book, it is extremely obscure and difficult to understand.

Although it has been passed down through master and apprenticeship, Feng Shui masters and Taoist priests can make Feng Shui judgments based on the accumulated experience of their predecessors, and can even change Feng Shui.

Show people mansions, choose cemeteries.

But what kind of ability is this?

This feng shui technique is up to the sky, that is, to find the dragon vein and choose the mausoleum for the emperor Lao'er.

Anything else can really change?

Nothing!

However, Zhang Yuchu once saw a record in the classics of Longhu Mountain that he did not know whether it was true or false.

In this world, there is really a science that can see the feng shui of the world, not limited to one city and one place, or even limited to one country and one dynasty!

And this science is the real "Feng Shui".

As for the things that circulate in the world, they are only the skin, and at best, they can only be called "Feng Shui".

This is the relationship between "art" and "Tao".

No matter how thoroughly you learn the "technique", no matter how clear you practice, and how skilled you are, you are just ordinary people.

And the real "Tao" is what can make people qualitative!

In that book, this real "Feng Shui" was recorded, and it was only in the hands of the immortals!

Because only the immortals who are high above can overlook the world.

And this world is by no means limited to the Ming Dynasty!

It is not even limited to Korea, Japan, Champong, and Annam, but includes a farther and wider area.

Once, Zhang Yuchu thought that this was nonsense at all!

Why?

Because with the current level of understanding of the world, as well as the speed of movement, it is impossible for anyone to really see through the feng shui of the entire world, just walking around carefully in the Ming Dynasty will take an unknown number of years and what terrifying energy.

Not to mention, in all the known and unknown worlds, what about traveling around?

Further, even if you travel around the real world, can you really master it?

So, there are only immortals!

There are only immortals!

The immortals are high in the sky, fishing for luck in the world, and naturally know all the mountains and rivers in the world and the direction of the wind.

One is seen in the sky and the other is seen on the earth, how can it be compared?

Therefore, Zhang Yuchu believes that this so-called real "Feng Shui" is not something that mortals can master at all.

But today, Zhang Yuchu suddenly had a bold and terrifying idea in his heart.

Could it be that what Jiang Xinghuo is talking about is this legendary knowledge that only immortals can master?

In fact, it is not surprising that Zhang Yuchu has such an idea.

After all, in this world, where great geographical discoveries have not occurred, and there have been no successive navigators who have explored the direction of ocean currents and monsoons around the world, it is indeed impossible for "mortals" to master the wind and water of the world.

In later generations, it is completely different, not only have the information that has been summarized, detailed and easy-to-understand pictures, but also have satellites hanging in the sky as "eyes in the sky", constantly monitoring the changes of wind and clouds and the dynamics of ocean currents.

It is not surprising that Jiang Xinghuo was able to say these words in this era, and it was not surprising that Zhang Yuchu thought that he might really master "Feng Shui".

Having said that, this is also a guess that Zhang Yuchu and Zhang Tianshi accidentally rose up in his heart, and there is no conclusive evidence, after all, although what Jiang Xinghuo said is touched, he still needs more evidence to prove that what Jiang Xinghuo said is the legendary "Feng Shui".

Next door, under the tree with a new crooked neck.

Jiang Xinghuo's words continued.

"You have all played games that simulate the Yuan Dynasty before, so I won't repeat them here, you should know very well how much impact successive natural disasters will have on the country's finances and national fortunes."

Li Jinglong and Zhu Gaoxu nodded, revealing expressions that couldn't bear to remember.

It hurts, it hurts!

And these things that have happened in real history, and the choices they have experienced in person, actually all show that the short life of the Yuan Dynasty must be related to the continuous decline in temperature.

When the Mongols were in the steppe, they lacked a water body with a greater heat capacity, so they were forced to go south and west to conquer the world, but even if they obtained land close to a water body with a large heat capacity, without the torture of temperature difference, they still had to face the huge problem of temperature.

"So what Mr. Jiang means is that the temperature drop that Daming is facing now has actually started since the Southern Song Dynasty?" Li Jinglong asked with some frustration.

"Yes."

Jiang Xinghuo agreed with his words, but added: "Of course, the temperature does not fall all the time, there will be a period in between, such as the period when the Yuan Dynasty was established and the Southern Song Dynasty fell, the temperature actually turned around and rose for a while, but then it turned around and continued to fall." ”

"You don't have to worry too much, the temperature of Daming will not drop all the time in the future, if nothing else, there will be a period of rise in the middle, and finally it will turn around and fall sharply like the Yuan Dynasty."

Hearing this, the two of them had a Sima face.

What does it mean not to worry too much?

How did it sound like the doctor saying to you: "Don't worry, although it is a terminal illness, it will be a few months before it returns, and it will deteriorate rapidly after the return to light." ”

"The future of Daming, will this really be the case?"

Zhu Gaochi's expression in the secret room also became extremely solemn, and he even felt cold all over his body - the wheels of history were rolling forward, and there was no turning back.

At this moment, the result given by Jiang Xinghuo is unacceptable.

No one can accept it.

Not to mention that the patient's family is emotionally unstable, the patient is about to have an emotional breakdown.

The reason why Zhu Gaoji was so optimistic before was that he initially felt that the so-called "Xiaoice River Period" might only last for a few years, at most more than ten years, and the imperial court only needed to build extensive warehouses and store grain like the Sui Dynasty.

Later, although Zhu Gaoji heard Jiang Xinghuo say that the Xiaoice River period would last for hundreds of years, because he did not turn the corner at that time, he thought that the chemical fertilizer and Jiang Xinghuo wanted to talk about the method that could increase the upper limit of the population by 30% could resist the Xiaoice River period together.

However, as time passed, Zhu Gaochi immediately discovered his mistake.

As soon as food production increases, and the upper limit of the population that can be fed increases, it will inevitably lead to a population explosion!

If the future of the Ming Dynasty is facing a continuous warm period, this situation is good to say, but it will greatly enhance the national strength of the Ming Dynasty, after all, in the early years of the Ming Dynasty, the actual situation faced is actually more people and less land.

The number of the common people is different from that of the vassal king, and the more the people, the better!

But now Jiang Xinghuo has really illustrated the example of the Mongols.

In order to escape the torture of the temperature difference, the Mongols were about to knock down the whole world, except for the king of Zhennan, who could not succeed in occupying the city three times.

But in any case, the Mongols did run out of the steppe.

The result was only delayed for less than a hundred years, and the continuous drop in temperature during the Xiaoice River still caused chaos in the world.

And Daming is not the same as the Mongols, where can you run when you encounter the Xiaoice River period in the future?

Heading south to Champ?

Daming has nowhere to run but to resist.

Jiang Xinghuo's chemical fertilizers and other methods, although they can increase agricultural output, will inevitably bring about the problem of population growth, the more people who need to fill their stomachs and wait to be fed, and the more people who are easy to get up.

So, what should Daming do?

"In the next few decades." Zhu Gaochi said in a deep voice, "Or, within a hundred years at the latest, the Ming Dynasty must find a way to solve this problem." Of course, we can leave things to our children and grandchildren, but if our children and grandchildren cannot overcome the crisis of the Xiaoice period, Daming's national fortune will be completely terminated, and there will be no chance of a comeback. ”

Zhu Gaochi was silent for a while, and looked up at everyone.

Zhu Gaochi's expression became serious, and he asked in a deep voice: "At that time, if my children and grandchildren went underground, I am afraid I would not be able to forgive myself for turning a blind eye today." ”

"Your Highness, don't be impatient." Xia Yuanji immediately comforted, "The minister just mentioned, this kind of thing needs to be planned slowly, even if this is what Jiang Shi said, we have to go back to the history books, check the information, and then gather people of insight to jointly demonstrate whether it is correct." ”

"I'll do it myself."

Zhu Gaochi nodded, and he said: "I will ask several scholars in the cabinet to consult the historical classics of all past dynasties in detail to see if the changes in temperature and precipitation are consistent with what Mr. Jiang said." ”

Zhu Gaoxu looked at the simple text map on the ground, still a little puzzled.

Adhering to the good habit of "asking if you don't understand", Tie Hanhan opened his mouth to express the doubts in his heart.

"Mr. Jiang, I know the concept of 'farming-nomadic precipitation dividing line' you just mentioned, but I don't understand the principle, I only know a little about it."

Zhu Gaoxu pointed to the line of Longxi-Hetao-Shanxi-Hebei on the map and said: "You said just now, what is here. 400 mm isoprecipitation line? I don't have any idea what you said, how tall is 400 millimeters you said? ”

Jiang Xinghuo thought about it for a while, the construction ruler of the Ming Dynasty was equal to 32 centimeters in modern times, and 400 millimeters was 0.4 meters, that is, one and a quarter of a foot.

"One and a quarter feet."

Zhu Gaoxu measured it slightly with his hand, feeling a little incredible.

"Is there so much water every year? Isn't it a little too little, I'm afraid the knees are not enough, right? ”

"Not much, really." Jiang Xinghuo admitted, "But this is the total amount of precipitation on the Great Wall in a year." ”

Jiang Xinghuo asked: "Think about it carefully, in addition to the spring rain, a few thundershowers in the summer, and the rain in the north, do you mainly rely on the autumn rain?" If you think about it like this, how high do you think you can accumulate in a year? ”

Saying this, Zhu Gaoxu roughly figured it out.

Zhu Gaoxu still had doubts, he said: "Then this little rain alone is enough for agricultural irrigation?" ”

Jiang Xinghuo said with a smile: "Of course not, in fact, these rains are not calculated according to the fall on the cultivated fields, but the accumulated rainfall height based on the entire plain ground. As a result, most of the rainwater flows into rivers, lakes, and groundwater, where it is stored in a different way, and only then is pumped out of these storage areas when farmers need to use it. ”

"In fact, the precipitation line of one and a quarter feet is not only the boundary between agricultural and nomadic precipitation, but also the boundary between 'arid' and 'semi-arid' areas."

Li Jinglong asked thoughtfully: "That means that the location of the Great Wall coincides with the precipitation line, in fact, it is not a coincidence, but it is to protect cultivated land?" ”

"I don't think so." Zhu Gaoxu retorted: "From a military point of view, the Great Wall can only be built on the mountain, and it must not be built on the plain, so it should have little to do with what you said." ”

Hearing Zhu Gaoxu's words, Li Jinglong was also a little uncertain for a while, after all, this was just his speculation.

But Li Jinglong's speculation, in his own opinion, is also problematic.

It's like. Shoot the arrow first and then draw the target.

"It's a coincidence, it's not a coincidence."

Seeing that the two couldn't figure it out, Jiang Xinghuo took over: "The coincidence is that the two lines do basically coincide, not a coincidence that it is precisely because of these mountains that the rainfall will form a difference between the north and south." ”

"What?" Li Jinglong was a little surprised.

According to Jiang Xinghuo's meaning, it was actually the mountains that affected the rainfall, and then due to the different amounts of precipitation, the north and south sides of the mountains formed a farming-nomadic division.

"Do you know where the word Feng Shui came from?"

The secret room next door.

Zhang Yuchu, Zhang Tianshi's eyes widened suddenly!

What?!

Jiang Xinghuo actually mentioned "Feng Shui"!

Originally, this was just a story in the classics that he thought of when he accidentally listened to Jiang Xinghuo's lecture.

Actually, I don't know for sure.

But now, Jiang Xinghuo said it himself!

Don't?

Zhang Tianshi's black face also became solemn, this time it was not pretended, it was really dignified.

Could it be that Yuan Hui and Dao Yan calculated correctly?

This person named Jiang Xinghuo is really an immortal?

In addition to this reason, how to explain that Jiang Xinghuo said this sentence in such a coincidental situation?

Zhang Yuchu's heart became both nervous and excited.

The worrying place is that Longhu Mountain has cultivated immortals for a thousand years, but he has never seen a true immortal.

The excitement was that it was highly likely that he was about to hear the immortal preach!

The immortal himself narrated what is the real "Feng Shui"!

Instead of the "Feng Shui" practiced by Taoist priests!

Contrary to Zhang Yuchu's expectations, Jiang Xinghuo's explanation was very brief, but it was not simple.

"In fact, the meaning of feng shui, popularly explained, is that the direction of the monsoon, the direction of the [wind], the heat and cold, directly affect the amount of precipitation, ocean currents and other [water] effects."

Jiang Xinghuo asked: "Are you the one who led the troops to fight, or the question just now, take the mountains as an example, but it is slightly different. Tell me, is it cold on the windward slope or on the leeward slope in the mountainous area? ”

Zhu Gaoxu said without thinking about it: "If it is a cold wind, it must be a cold windward slope, and the camping must be hidden on the leeward slope, leaning on the mountain to block the wind." ”

"Where does the wind in northern China usually blow?"

"From Mobei, of course."

As soon as he finished saying this, Zhu Gaoxu and Li Jinglong looked at each other in surprise.

The answer has already been spoken!

According to the geographical theory taught to them by Jiang Xinghuo, it is precisely because the temperature affects the precipitation that the hotter the state will have more precipitation, and the colder the state will have less precipitation.

So since the mountains in the north block the cold wind, it means that the cold state is blocked from going south, which means that the temperature in the south is not as low as in the north, and the hotter weather will inevitably bring more precipitation!

"I see!"

Zhu Gaoxu said excitedly: "It is precisely because there are mountains first, so the temperature in the north and south is different, and the precipitation is different, forming an invisible precipitation dividing line, resulting in the south of the mountain is suitable for farming, and the north of the mountain is suitable for nomadic Qin Shi Huang will build the Great Wall according to this situation, plus the mountain is steep and conducive to defense, so the Great Wall was built!" ”

"It's really not a coincidence." Li Jinglong also said.

"Of course, this is just a very visual example of [the wind] in terms of history and geography."

Jiang Xinghuo said with a smile: "In fact, the role of [wind] is not limited to the east-west mountains blocking the cold wind, which then leads to the difference in temperature and precipitation between the north and south terrain. ”

"Is it more than that?" Li Jinglong was slightly surprised, he thought that there was only one explanation.

"Of course it's more than that."

Jiang Xinghuo said: "Do you know how many kinds of [wind] flow in such a huge country as the Ming Dynasty? ”

Li Jinglong and Zhu Gaoxu looked at each other.

And Zhang Tianshi, who was in the secret room next door, was swollen with excitement at this time!

I'm sorry for sending it late!

(End of chapter)