Xu Yue Wan didn't seem to hear anything. He just held the wooden tablet, his whole body was shaking, and muttered, "It's wrong... Why is it wrong... How can it be wrong..."

Kan Ze, who was beside Fei Qian, said worriedly: "Lord, Master, he hasn't had a good rest for three days. If this... continues like this..."

"Have you anything to eat?" Fei Qian asked.

"There is food... but not much..." Kan Ze said, "When it is brought to his mouth, he sometimes takes a bite and drinks a little, but he never sits down to eat properly..."

Fei Qian frowned, this was not the way to go. "It is the right way to relax and relax. It is not good to be so exhausted without rest..."

"My lord, this is a temporary confusion," Huang Xu said, "This is a common thing in the army. After getting out of the battle formation, he becomes confused and confused. If he is put to sleep for a while, he will probably be cured."

Fei Qian nodded, "You might as well give it a try."

Huang Xu held up his hands and was about to swing his arms forward to knock Xu Yue unconscious, but was stopped by Kan Ze on the side. "My lord, my lord! Please be merciful... I also know this method, but I don't dare to do it... just in case."

It hurts my mind, this..."

Fei Qian looked at Kan Ze, why did he feel that Kan Ze's attitude towards Xu Yue seemed to be better than his treatment?

But what Kan Ze said makes sense. After all, Xu Yue is not a military commander in the military academy. It would not be pretty if he really suffered a concussion.

"Come on, go to the Hundred Medical Center and boil some soothing medicine and bring it over! Go and come back as soon as possible!"

The soldiers on the side responded and hurried away.

There are many health-preserving prescriptions in traditional Chinese medicine. Although they may not have the sedative effect of Western medicine, the advantage is that they have fewer side effects, not to mention that this is the only method that can be used at the moment.

Sun offset.

"That's not right... Those who correct the new moon are calling it the beginning of the year..." Xu Yue was still mumbling, "Looking down closer... the sun is in the east and the moon is in the west, that's right... but why is it wrong?"

Fei Qian turned around and asked Kan Ze, "What does it mean to know that Senior Brother Xu is doing this?"

Kan Ze reported back: "Master said that there are differences in the twenty-four sections...it is very different from the sun and the moon, so it needs to be re-deduce..."

Fei Qian nodded.

Understood.

The arrival of Little Glacier not only drove farmers crazy, but also drove calendar scholars crazy.

The lunar calendar, based on the synodic changes of the moon phase cycle, stipulates that the length of a month is 29 or 30 days. Because the overall temperature in China was relatively warm during the three to four hundred years of the Han Dynasty, the earliest lunar calendar was calculated using the moon phases.

The crop maturity cycle, which stipulates that a year is divided into 12 lunar cycles, is called a year, and the year is when the grains are ripe. This lunar calendar guides agricultural farming and the corresponding 24 solar terms. Generally speaking, there is no big problem.

But after all, there is a time difference between the lunisolar and solar calendars, so the reason why Fei Qian's master Liu Hong re-established the calendar before was because of this. As time goes by, the difference between the lunar calendar and the solar calendar becomes more and more obvious, and now, it is

It became more prominent.

This is why Fei Qian attached great importance to the calendar and asked Xu Yue to start implementing the new calendar.

A ruler who cannot accurately guide his people to farm in a timely manner, or even has major calendar deviations, is a serious political crisis in any case.

Obviously, Xu Yue has problems in this regard...

And if Xu Yue can't solve this problem, it means that Fei Qian will have problems in this regard. Although the end of the Han Dynasty to the Jin Dynasty, and then to the Wuhu chaos in China, can be regarded as a relatively bad time period, but it can not be bad.

Some, it’s better not to be bad.

But now it seems that Xu Yue has fallen into a bottleneck and is stuck.

Among the twenty-four solar terms, the summer solstice and the winter solstice were the first two seasons to be determined due to their special characteristics. Even in ancient times, the winter solstice was the beginning of the year.

This is very easy to understand.

The twenty-four solar terms have nothing to do with the months of the lunar calendar, and are only closely linked to agriculture. Therefore, the temperature is now chaotic during the Little Ice Age, which has also caused calendar scholars to collapse...

Not long after, the soldiers galloped back and brought back a bag of decoction.

Huang Xu took it, then turned his head to listen to something, nodded, turned to Fei Qian's side, and whispered.

Fei Qian's eyes moved slightly, then he signaled Kan Ze to get the medicine, poured a bowl, and brought it to Xu Yue's mouth.

When people are subconscious, they are more willing to accept the approach of those close to them, and they are less likely to resist.

Maybe he was also thirsty. Xu Yue tilted his head, keeping his eyes on Rigui, and then took a few sips. He disliked the bowl that Kan Ze brought over and blocked his sight, so he pushed it away impatiently.

Kan Ze looked back at Fei Qian, who signaled that he wanted to feed him more.

Kan Ze found another opportunity and drank most of the Ningshen Decoction in his skin to Xu Yue.

Perhaps it was the effect of the decoction, or perhaps the body itself was exhausted. Not long after, Xu Yue's body began to shake, and then he fell down...

Kan Ze, who was well prepared, quickly stepped forward to support him, and then entered the room with Xu Yue, who had fallen asleep on his back.

Fei Qian stepped forward and picked up the wooden tablet that fell from Xu Yue's hand.

The wooden tablets are densely packed with numerical values ​​and calculations, basically all about the length of the day and the time in years and months.

During the period of Emperor Wu of the Western Han Dynasty, the twenty-four solar terms had been included in the "Taichu Calendar" as a supplement to the calendar to guide farming. It was just the same as what Xu Yue had done before, using Tugui to measure the sun's shadow to determine the solar terms. Then it was used to determine the solar terms.

The length of the sun's shadow is equally divided into the years and months, and this is used to determine the twenty-four solar terms.

And here's the problem.

To put it simply, it is to use the straight to find the curve, to use the small to find the big, to use the finite to find the infinite. At this moment, among the entire Han Dynasty, there are only a handful of people who can study it.

number.

After all, not everyone can understand the difference between the sun and the earth, regardless of their shape or state of motion, between ellipses and circles, just like some trolls will say that piracy is also a copy. For scholars, how can it be considered stealing?

Fei Qian thought for a long time, and then something suddenly dawned on him.

The twenty-four solar terms established during the reign of Emperor Wu of the Han Dynasty were linked to the length of the shadow of Rigui. This method cannot be regarded as wrong. After all, the four major nodes, the spring and autumn equinoxes, the winter and summer solstice, are not wrong, but the other solar terms cannot be regarded as wrong.

Divided equally according to the length of the shadow...

This problem even affected for a long time. Finally, in order to solve this problem, the wise ancients added the changes of the sun to the lunar calendar based on the changes of the moon phases. This is the origin of the Chinese solar calendar, and summed up the twenty-four

Solar terms and intercalation methods are used to reconcile yin and yang. This progress is undoubtedly unprecedented, and it is also the reason why the lunar calendar can still accurately guide agricultural times after thousands of years. This fundamentally gives the lunar calendar endless vitality and allows it to be used in future generations.

What should I say?

The intersection angle between yellow and white? Perihelion and aphelion? Calculation formula of ellipse?

How can Xu Yue understand and accept it, and at the same time, there must be a statement that is consistent with the current situation and can also solve the current disconnect?

"Get a pen!"

Fei Qian took the pen in his hand, thought for a long time, and finally put it down...

"Gen, the hexagram of Northeast, is where everything ends and everything begins."

This is the Book of Changes, which tells the hexagrams.

"The solar terms of Zhuanghe are acquired. Therefore, the Gen hexagram returns to the Yin position."

This is acquired gossip.

"The sky spins, the earth spins, the stars move, the seasons change, everything has its destiny!"

This is the Big Dipper.

"The sun and moon are uncertain, so look for the stars!"

This is based on the Beidou to determine the twenty-four solar terms!

Seriously speaking, of course the position of the sun is used to determine the twenty-four solar terms, but many ancient astronomers did not have the sunglasses of later generations, many did not know how to protect themselves, and they were blinded for the cause of astronomy.

There are only a few, and the one closest to the sun's rotation coefficient is Beidou.

Observing Beidou at night is naturally more friendly than staring at the sun during the day...

Although Beidou will also cause speed changes due to other factors, it will generally not be a problem to use it for hundreds of years after it is determined...

After descending from Lishan Mountain and asking Kan Ze to take care of him and report back if anything happened, Fei Qian returned to Chang'an. Halfway there, he ordered: "Let Shi Yuan come and come!"
Chapter completed!