The dark night sky is dotted with stars, and the gorgeous twinkling stars indicate a kind of eternity.

No matter how time changes, only the stars in the sky will never change.

In the blink of an eye, time passes by for tens of millions of years.

When people face such a starry sky, only when they understand the truth of the starry sky will they realize how insignificant human beings are and how insignificant human life is.

The night wind was very cold on the body. At the entrance of the village of Lishan, the couple stood under the starry sky. Li Yue looked up and said, "Husband, please speak."

Zhang Yang first took out the compass and pointed to a star in the north, "Have you seen this star?"

Li Yue nodded, folding her arms and leaning against her husband to avoid some wind. She looked up and said, "I see you."

"This is the North Star. In Yuan Daozhang's words, it should be the Ziwei Star."

"I know Ziweixing, Ziweixing will never change."

If the daughter-in-law can understand this common sense, it will be much easier.

Since her pregnancy made her life inconvenient, she has been reading books all day long, frantically adding all kinds of knowledge.

It ranges from astronomy to the art of war, and even some geographical records.

The aunt brought a coat for Her Highness the Princess to put on.

Li Yue looked at her husband's profile and listened quietly.

"Actually, for us, the stars in the sky are coordinates that can be used to mark our current location. The location of Ziwei Star is a good reference for us."

Zhang Yang held the compass and said, "After we confirm the position of Ziwei Star, we have to measure it and put our fingers against the horizon to calculate the approximate height of Ziwei Star and the horizon."

Li Yue nodded and listened patiently.

"This is like a trigonometric function. We know the height of the horizon and Polaris. Calculating it as two degrees on one finger, the higher the Polaris rises, the greater the angle."

Aunt Yang stood aside, looking at the couple cuddling together with a smile on her face. Unlike other couples, they discussed state affairs in their free time.

Now we can still study the stars together, what we do is so different, but our relationship remains the same as before.

Her Royal Highness the Princess is very happy now. This is the end of all hardships.

"Does this need to be calculated using the trigonometric formula taught by my husband?"

Li Yue understood quickly. She wrote the calculation on the ground with a branch, and the result was seventy-five.

Zhang Yang nodded, "This is our latitude. Based on the angle we calculated, you can look at the compass."

She frowned and looked at the compass for a long time, followed the scale to find the corresponding position, and said: "Mao Qi Gui Si, December 3..."

Li Yue, who suddenly realized the truth, said happily: "It can really be calculated!"

"This is the calendar that Master Yuan and Master Li Chunfeng learned, and it is also the secret of the stars in the sky."

The mystery that had troubled him for three years was finally solved. Li Yue hugged her husband happily, and then hugged Aunt Yang happily, "Aunt, I have solved the longitude, latitude and calendar. I have learned it."

Aunt Yang looked at her dotingly, "As long as the princess wants to learn, she can learn anything."

Li Yue was very happy, this was a breakthrough she had worked so hard on.

"Speaking of which, this was also inspired by Daozhang Yuan's compass."

Li Yue stopped smiling. She would also be the mistress of Lishan in the future. She was as happy as a child just now, but now she stopped smiling and looked serious.

When the couple's eyes met again, Li Yue burst into laughter again.

"Daozhang Yuan has worked so hard for so many years, but my husband has cracked it open. If he knew about it, he would probably go crazy."

Zhang Yang put away the compass and erased the calculations on the ground, "Actually, I calculated it based on Yuan Daozhang's compass. I can only say that it was his foundation that allowed me to make the progress I have made now."

The couple returned home. Xiao Wu and Xu Hui took a bath, ate and went to bed.

After a day of playing in Lishan, they were exhausted and the little bear was exhausted.

Li Yue was in a good mood. She filled a jar with cooled boiling water and put it outside the window to wait for the water to condense into ice. "I will make a smoothie tomorrow and put some dried fruits and jam in it for these two girls to eat."

After doing this, Li Yue sat down again, recalculated today's insights, and drew circles and latitudes again.

"In my husband's words, the dimension we are in is seventy-five. How do I find the latitude?"

Zhang Yang was sitting outside the door washing dishes, "The radius must be divided by half. Taking the center line as the equator is zero degrees upward."

Based on this statement, Li Yue began to calculate and search for equal parts of the line to find the line at the thirty-fourth latitude.

At this moment, she frowned again, "If you don't know where the longitude is, but you only know where the latitude is, you still don't know where Lishan Mountain is."

Zhang Yang quickly put the washed dishes back into the cabinet, "The longitude needs to be measured during the day, and compared with the angle of the stars tonight, a sundial is also used to record the time changes, and then the height of the sun can be deduced."

On the drawing, Zhang Yang drew an umbrella diagram, "Calculate the angle at each moment, and each angle extends to the horizon where we are, which is our longitude. The method we used tonight is more complicated."

"I'm going to calculate it myself this time."

Being pregnant once made her motivation to study disappear, and now she has returned to the state she was in a year ago.

The other side of the village.

Yuan Tiangang was still sitting cross-legged, thinking hard.

After sitting for a long time, he suddenly laughed. He stood up like crazy and read the Tao Te Ching.

Inside the room, Li Tai saw this situation and asked, "Master Li Chunfeng, is Master Yuan sick?"

Li Chunfeng still held the scroll in his hand and turned to look outside the room, "My heart is broken."

"is it serious?"

"It doesn't matter, it's just a broken Taoist heart. It will get better after a while." Li Chunfeng said calmly.

Li Tai scratched his head in distress, "Yes...really?"

"If Zhang Yang's inference is correct, it can be seen from the iron pestle hanging on the sand table that the earth under our feet is indeed rotating. In addition, Taoist priest Yuan personally sent people to various places to make such sand tables this year."

"According to what Zhang Yang said, for us, the scale marks from north to south, from Lingnan to Shuofang are all regular." Li Chunfeng crumpled the paper into a ball, "Your Highness, King Wei, please look at this ball of paper, if it is a particle

Ball, we live on one of the points. The traces of rotation of the ball from top to bottom also change with the position. The higher the point, the faster it rotates with the ball. From this, we can see that we are not only living on a ball.

And it’s still a spinning ball.”

"Furthermore, this is the place that Taoist Yuan personally sent and personally selected. All the facts are in front of you. What you have learned all your life has come to fruition. When you understand the appearance of the world, you find that it is contrary to what you have learned all your life. But the fact is that the process of verification has been

It was Taoist Master Yuan who did it himself and came to seek verification on his own. Can his Taoist heart not be broken?"

Li Tai said melancholy: "It's all my brother-in-law's fault."

Li Chunfeng said again: "Your Highness, King Wei, don't worry."

"Okay." Li Tai looked back and saw the guard coming with a bowl of vegetable leaves, which was today's dinner.

Taking the bowl, Li Tai poured some minced meat into it, stirred it, took a bite and asked, "Do you want to eat it, Taoist Master Li Chunfeng?"

Li Chunfeng glanced at the bowl of vegetable leaves and asked, "Is this edible?"

Li Tai chewed in his mouth and said to the guard: "Kill two ducks to make food for the two Taoist priests, and then go to Lishan Medical Center to ask two doctors to come over and see if Taoist priest Yuan can be saved."

Yuan Tiangang was laughing and talking to himself, reciting the Tao Te Ching.

The guard left in a hurry, and Li Tai finished the vegetable leaves in the bowl. "In winter, there are only spinach and cabbage. You can eat them by boiling them with water. My brother-in-law planted the seedlings himself and cultivated them in the village. Now each family has their own."

Every household has it, so the Taoist priest should also try it."

Li Chunfeng shook his head with a regretful expression, "Daoist Master Yuan has a heart disease that cannot be cured."

Li Tai clasped the vegetable leaves between his teeth and said, "I also have a heart problem. I will vomit as soon as I arrive in Chang'an."

"That's a strange thing to say."

"I'm really going to vomit."

Li Tai said it seriously.

The next day, Li Tai got up early and saw Yuan Tiangang standing at the door watching the sunrise.

"Master Yuan, what my brother-in-law said may be wrong. Don't think that what you have learned in your life has been wasted."

After a night of hesitation, Yuan Tiangang was full of energy at the moment. This was the state after a great enlightenment. His eyes seemed to be shining brightly, "It is to inherit the treasures and knowledge of the predecessors. I should complete the achievements that the predecessors of the past generations have not achieved.

Even if I spend my entire life, I will definitely see through the truth of the world."

It seems that Yuan Tiangang is back to normal again.

Li Tai also let out a sigh of relief. If his father knew that Yuan Tiangang came to Lishan, he would go crazy and he didn't know what he would think.

At this time, Yuan Tiangang faced the rising sun, just like an ordinary person, and he was a little worried about whether he would go crazy later.

Li Chunfeng came over and said suspiciously: "Actually, I still have a doubt in my mind."

Yuan Tiangang was in high spirits, his Taoist robes rustled in the wind, and he had the air of an immortal Taoist spirit. "What's the confusion?"

Li Chunfeng clicked his tongue and said: "If we really live on a ball, and this ball is still rotating, it stands to reason that we will feel it, or the person standing on this ball will fall."

The smile on Yuan Tiangang's face solidified.

"Are we living under the sky, or are we living above the sky?"

Li Tai shivered in the cold morning breeze. The little snow that melted yesterday left puddles on the ground, and now these puddles have frozen into ice.
To be continued...