In junior high school geography, I learned about moon phases.

If we say that the moon moves in reverse direction every fifteen days within a month.

Then, during the day, the sun's movement trajectory does not reciprocate, and the sun must rise in the east and set in the west.

Therefore, if it is difficult to judge the time at night, it is much easier to judge the time during the day.

There is only one difficulty. Li Mengxi is accustomed to the 24-hour clock in modern society, and is subtly affected by it.

After learning from Guan Yu how to judge the time at night through the moon, Li Mengxi was thinking about how to convert the time into a 24-hour clock, so that he would be more accustomed to it.

The key is to establish a timeline. To establish a timeline, it is necessary to find a standard time point. The only time point that Li Mengxi is certain of now is "midnight".

Midnight, that is, twelve o'clock in the middle of the night, is 24:00 in the twenty-four-hour clock.

Guan Yu said, Zi time is midnight.

In other words, midnight is at 0 o'clock——?

While Li Mengxi was still thinking about what time one hour equals the 24-hour clock, Guan Yu saw that Li Mengxi seemed to have thought about it and picked up the stick on the ground again.

"Xi'er, as I just said, is the image of the moon from the second to the fifteenth day of the lunar month."

Then, Guan Yu tapped another moon phase diagram with a wooden stick, "From the sixteenth to the end of the month, the moon phases are generally reversed, but the hours are still, You, Xu, Hai, Zi, Chou, Yin, Mao,

Chen, do you understand?"

"Yeah." Li Mengxi nodded.

"Okay." Guan Yu held the wooden stick in his right hand and tapped his left hand twice. "If you say you understand, I will give you a test."

Guan Yu was like a strict teacher, with a serious face. He held the wooden stick in his hand and beat it rhythmically, as if holding a ruler.

If you take a test, you will take a test, and Li Mengxi is not afraid.

"Okay." Li Mengxi agreed without any psychological pressure.

Guan Yu saw that he was so confident, so he pointed at a certain moon phase chart and said, "Here."

The only difference between the two moon phase diagrams is the very first point, where Guan Yu made two obvious pits with a stick to indicate whether the beginning of the month was in the east or west.

Li Mengxi took a look and saw that the moon picture pointed by Guan Yu showed that the moon was on the left at the beginning of the night, that is, the moon rose in the west and set in the east, which was the first quarter moon mentioned in geography textbooks.

Look again at the point pointed by Guan Yu, the second one from the left.

Li Mengxi bit his finger and thought for a moment. He first looked for Ye Ban, who was Zi Shi, and the point pointed by Guan Yu was next to Zi Shi.

Combined with the moon phase diagram to show the first quarter moon, Li Mengxi determined the time.

"It's Haishi." Li Mengxi gave the answer.

The answer is correct.

But Guan Yu looked at Li Mengxi and seemed hesitant to speak.

"Here." Guan Yu pointed to another point and asked Li Mengxi to tell what time it was.

Li Mengxi still started from the middle, starting from the hour, and then counted to the point pointed by Guan Yu to see how many hours were wrong.

"Yinshi." Li Mengxi answered correctly again.

…

"here?"

"Ugly time."

"here?"

"Xu Shi."

After asking relevant questions for several hours, Li Mengxi answered them all correctly.

(Twelve hours in a day,) Li Mengxi scratched his head, tilted his head and thought for a moment, (Zi hour, that is, after midnight, is the first hour of the day.)

"The twelve hours are Zi, Chou, Yin, Mao, Chen... Chen, Chen..." Li Mengxi frowned and scratched his hair. He really couldn't remember what time it was after Chen hour.

I just learned it and forgot it in the blink of an eye.

Li Mengxi had no choice but to ask again, "General Guan, when is the time after Chen time?" He Sihao did not feel embarrassed, looked at Guan Yu calmly, and asked.

"Ahem..." Guan Yu couldn't help but cough lightly. He wanted to laugh but was a little helpless. Guan Yu suppressed his emotions and muttered, "After Chen hour, it's Si hour."

"Oh." Li Mengxi nodded.

When Li Mengxi heard the word "si", he thought about it for a moment, and then he realized what the shape of this uncommon character was.

"Zi, Chou, Yin, Mao, Chen, Si, Er, Si... Si..."

Surprisingly, he got stuck again!

"Cough..." Guan Yu coughed again. He couldn't help but put his hand on his forehead and closed his eyes.

"After Si hour is noon hour."

"Oh." Li Mengxi nodded with a silly look, not at all embarrassed because he couldn't recite the time.

Noon is the noon at noon, noon hour is twelve o'clock in the day, 12:00 in the twenty-four-hour clock——?

Continue to memorize the time.

"Zi, Chou, Yin, Mao, Chen, Si, Wu... Wu..." Li Mengxi stuttered again.

Guan Yu looked up at the sky and sighed, "Wei." Guan Yu reminded.

Li Mengxi was like squeezing out toothpaste, Guan Yu had to remind him from time to time.

After a while, Li Mengxi got stuck again.

"Shen." Guan Yu looked at Li Mengxi and sighed.

After asking three questions, Li Mengxi finally felt embarrassed. He scratched his head and smiled shyly, "What about after Shen Shi?"

"After Shen Shi, it is You Shi."

"Huh?" At Youshi, Li Mengxi suddenly felt that the hours were connected from beginning to end, "After Youshi, Xu, Hai, Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You."

Li Mengxi smiled, he was finally able to connect the twelve hours.

After sorting out his thoughts, Li Mengxi sat up straight and recalled the twelve o'clock again. He cleared his throat, "The twelve o'clock are Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, and You.

,xu,hai.”

"General Guan, did I recite it correctly?"

Guan Yu just waved his hand to Li Mengxi. He didn't want to talk to Li Mengxi anymore.

Li Mengxi chuckled.

He raised his head and looked at the moon in the sky, "It's midnight, it's late at night, General Guan. I'm going back to sleep, and you should have some rest earlier. Also, thank you for your teaching today. I really appreciate it."

As he spoke, Li Mengxi stood up, took a step back, brought his heels together, straightened his legs, stretched his arms forward, bent his waist at a ninety-degree angle, and bowed his hands solemnly.

After Li Mengxi greeted him, Guan Yu had a clear smile on his face, and his eyes almost narrowed with laughter.

"Go to rest early." Guan Yu waved goodbye to Li Mengxi.

Watching Li Mengxi's small figure interspersed among the bonfires until he disappeared into the night, Guan Yu withdrew his gaze.

Looking up, the moon is bright in the sky.

"It's indeed the right time." Guan Yu said to himself, stroking his long beard.

——

On this day, Li Mengxi learned something else.

He can initially judge the weather.

The best time points to judge are two.

During the day, when the sun is in the middle of the sky, it is noon, which is noon time, which is about 12:00 on the twenty-four-hour clock.

At night, when the moon is in the center of the sky, it is midnight, that is, around 24:00.

With these two important points in time, a connection has been established between the ancient time and the 24-hour system that Li Mengxi was familiar with.

Then, you can calculate the twelve o'clock by yourself, which corresponds to what time it is.

When we got back to the carriage, it was very late at night, so I put him on the bed and fell asleep.

Li Mengxi never felt sleepy.

He simply got up, climbed up lightly, put on his clothes, gently opened the small window on the carriage, and looked at the moon in the sky through the window.

It's August, the weather should be early autumn, and the night is a little brighter.

On the first day of August, the moon in the sky was indeed a small crescent, as thin as a playful thread.

Under the sky of this different time and space, looking at the slender crescent moon, Li Mengxi gradually thought of his past life, his childhood, and his grandfather.

Yes, it's related to the moon.

When I was a child, I would sometimes go out to run and play with my grandfather at night. As he walked, my grandfather would ask, "Hey, what day is it today?" As he said this, my grandfather would look up at the sky.
To be continued...