There are countless things happening in this world all the time, and there are only a few official histories, and it is impossible to record everything.

At this time, the details can only be found through local chronicles, genealogies, and the essays of literati.

The problem is that the official history has the opportunity to be copied and printed in large quantities, and local chronicles, genealogies, and essays often exist alone, and once destroyed, they are no longer there.

And the various historical materials recorded in these books will also disappear with them, and every turmoil will cause immeasurable losses to historical materials.

Take the end of the Eastern Han Dynasty as an example, I don't know how many books were destroyed. The establishment of the Western Jin Dynasty finally sorted out the remaining books, and the Yongjia Rebellion broke out......

Let's put it this way, Mozi was destroyed in the war during the Northern and Southern Dynasties.

When I looked through the history books in my previous life, Wen Yi deeply regretted this whenever I thought of this. Traveling to this era, after the establishment of the Tang Kingdom, he began to rescue all kinds of books.

At first, it was done through the hands of Du Zigong, and later used trade to buy books from all over the world. No matter what kind of book it is, as long as it is a book, he wants it.

Throughout the ages, people have a common problem, only paying attention to the books of famous people, and the manuscripts of unknown literati are not as good as butt polishing paper.

The scholars of the Jin Kingdom attached great importance to the classics of the sages and the articles of famous Confucians, and other books would not be paid much attention to if they were not abandoned.

They don't see anything wrong with transcribing copies of these 'waste papers' in exchange for valuables.

The alien races such as the Yan State and the Qin State will not pay attention to these things, not to mention the manuscripts of ordinary literati, even the classics of the sages are used and sold.

Therefore, although the Tang Kingdom was established for a short time, the collection of books in the Hongwen Museum exceeded 100,000 volumes, which can be said to be the best in the world.

It's just that a large part of it is fragments.

No way, paper has not been popularized for a few years, and books of a little age are written on bamboo slips.

The storage and transportation of bamboo slips are very inconvenient, and it is normal for them to be seriously damaged.

At present, Hongwenguan has two main tasks, one is to interpret the classics according to Wenyi's ideas; 2. Salvage transcription of these books collected.

And these books did help Wen Yi a lot, such as a plague in a certain year, a certain month, and a certain place, but there is no relevant record in the official history.

For example, in a certain place, the winter suddenly becomes very cold, and it is snowing and freezing.

In 225 AD, Cao Cao sent Cao Pi to Guangling to inspect the training of the army. As a result, the Huai River froze over, and the training had to be stopped.

This is the first recorded record of the freezing of the Huai River in the history of the previous life.

But in this life, Wen Yi saw the information that the heavy snow in Nanyang and the thin ice on the banks of Huaishui during the period of Emperor Wu of the Han Dynasty were on a fragment of bamboo slips written by someone I don't know.

Following this line of thought, I found many records of extreme weather and plagues, earthquakes, floods, etc.

This kind of record was worthless to the literati at that time, but it was a treasure to Wenyi.

He copied and sorted out all these records, and then compared them with the Xiaoice River period pattern map he saw on the pressure, and basically could take care of it.

After getting the conclusive evidence, he immediately called all the core personnel of the Tang Kingdom to the Hall of Light.

Recently, everyone has seen Wen Yi's abnormal performance, and when he was called to a meeting at this time, he naturally knew that there was something big, and they all cheered up their spirits.

Wen Yi pointed to the regular diagram hanging on the wall and said, "Take a good look at this diagram, what did you find?" ”

Everyone had seen this picture just now and had been observing it, but it was the first time they had seen this kind of picture, and they were a little confused.

Xie Daoyun said: "Don't test everyone, King, this kind of picture is the first time I've seen it, although I have a little idea, I'm not sure." ”

Wen Yi smiled: "Then it seems that the queen has an idea, come and tell everyone." ”

Xie Daoyun glanced at him, but he didn't shirk, got up and came to the picture and said, "This straight line in the middle should be some kind of standard, and it is related to the temperature." ”

Wen Yi nodded and said: "Yes, this is the standard temperature, when the average temperature of the year reaches this line, although it will not reach the wind and rain, but it will not cause major natural disasters." ”

Xie Dao gave her a smug look and continued: "This curve is the actual temperature, and the part above the standard line represents a good year with good wind and rain. ”

"The part below the standard line means...... Disaster, year. ”

Wen Yi said appreciatively: "That's right, below the standard line means that the temperature is less than ...... throughout the year."

"As we all know, there are strict requirements for the temperature of crop growth, and half a month of wrong farming time will cause a reduction in yield."

"If the temperature is not enough throughout the year, then the best time for crops will never come, and the total grain production will be reduced."

"It's not just that, the world is a myriad of interconnected rings, involving the whole body."

"The impact of lower temperatures throughout the year is huge, causing extreme weather to occur more frequently. For example, floods and droughts year after year...... And drought brings locust plagues. ”

"Extreme weather can cause further crop losses or even no harvest, and people will not be able to eat, which means chaos in the world."

"The chaos in the world will kill a lot of people, and the more people who die will lead to frequent plagues and more deaths."

Xie Daoyun said thoughtfully: "The Shang, Western Zhou, Spring and Autumn Period, Warring States Period, Qin, Western Han Dynasty, Eastern Han Dynasty, Three Kingdoms, Western Jin Dynasty, and Eastern Jin Dynasty that you marked on this straight line...... It's just time, right? ”

"On the occasion of the Zhou Dynasty, the temperature was below the standard...... The time of the fall of the Qin State was the best year. ”

"Soon after the establishment of the Han Dynasty, the temperature began to drop again...... It was only during the reign of Emperor Xuan of the Han Dynasty that it returned to above the normal line......"

"From the end of the Eastern Han Dynasty to the establishment of the Western Jin Dynasty, the temperature was again below the standard line...... After the establishment of the Western Jin Dynasty, the temperature returned to normal, and it has been ...... until now"

"This seems to be a reincarnation, two hundred years of good weather will usher in a low temperature period of more than 100 years...... According to this rule, then the next low temperature period ......"

Xie Daoyun's eyes widened suddenly: "Fifty years later? ”

Wen Yi said with a heavy expression: "Yes, fifty years later, it will be the time when the next low temperature period will come, and at that time, the world will become a disaster in the late Eastern Han Dynasty." ”

"Sss Everyone present gasped at the same time.

None of them are the kind of powerful people who 'why not eat minced meat', except for Xie Daoyun, the highest background is the Hanmen, and most of them are ordinary people who have lived dozens of lives.

They know very well the impact of the year, the temperature, and the impact of extreme weather.

If this low temperature period really arrives fifty years later, it will really repeat the mistakes of the Eastern Han Dynasty, and changing the dynasty is just an ordinary thing.

Xue Dayuan swallowed and said, "It's not that I doubt you, is this picture accurate?" ”

Wen Yi said: "I went through all the books in Hongwenguan, summarized all the records related to the weather, and finally came up with this rule. ”

"I can't guarantee that it will be accurate, but there is still a certainty of seven or eight points."

"Well, there is a clear sign of the low temperature period, the winter water blizzard freezes."

"That's why I named this low temperature period the Xiaoice River Period...... It is characterized by a decrease in average temperatures throughout the year, an increase in extreme weather, and frequent floods and droughts. ”