Yellow crown?

As soon as Li Zexuan heard this name, he didn't feel very familiar, and after a while, he remembered that when the entrance examination of Yanhuang Academy was unveiled before, Li Zexuan had investigated the family backgrounds of the top few students, Li Yan was the second freshman, and Li Zexuan certainly had relevant information about him on his desk, so of course Li Zexuan knew a little about Li Chunfeng.

Li Chunfeng, Taoist Huang Guanzi, the first year of Zhenguan, put forward 18 opinions on the "Wuyin Yuan Calendar" written by Fu Renjun, a Taoist priest, and Li Er rewarded his talent and learning, adopted 7 opinions, and awarded Li Chunfeng to Shilang and serve in the Taishi Bureau.

The current Li Chunfeng is just a hairy boy who has just emerged in the court, and few people will care about him, but Li Zexuan, who has crossed over from modern times, understands what the three words Li Chunfeng mean. For this reason, he also specially asked people to check Yuan Tiangang's information!

Later, when he learned that there was no Yuan Tiangang in the court, he gave up. In fact, Yuan Tiangang only began to enter the court in the fifth year of Zhenguan.

"It turned out to be Daochang Li, disrespectful and disrespectful~!"

Li Zexuan returned the salute to Li Chunfeng and said politely.

Li Chunfeng looked at Li Zexuan seriously, which made Li Zexuan uncomfortable for a while, he always felt that Li Chunfeng's gaze seemed to have a penetrating power to peep through all things, and under this gaze, it seemed that all secrets could not be hidden, he was in his heart, and hurriedly picked up the "Taixuan Sutra", filled his spiritual power, and was on guard.

Seeing Li Chunfeng's complexion, his face suddenly turned pale, "Rude and rude, Poor Dao was surprised when he saw Hou Ye's face just now, and he made the old mistake again for a while, and he couldn't help but look at it twice, and I hope that Hou Ye will not blame~!" ”

Li Zexuan smiled and said: "It's okay, you and I belong to the same Taoist lineage, why blame it?" Ben Hou heard that he was good at calendar, astronomy, and arithmetic, and he would be a good student if he had the opportunity to ask for advice, and hoped that the Taoist would not hide it~! ”

Li Chunfeng's eyes flashed, and he arched his hand and said: "Hou Ye praises falsely!" Hou Ye has been famous since he was a child, how dare he compare with Hou Ye with this little trick! I came here today to use the telescope of Yanhuang Academy to confirm some conjectures in the past, and I hope that the Hou Ye will give convenience~! ”

Confirm some conjectures? I guess it's also related to the calendar, right?

Li Zexuan thought in his heart, and at the same time promised with his mouth: "Even if the Taoist is used, the door of the academy will be open to the Taoist at any time in the future, and the Taoist can come at any time if he wants to use this telescope!" ”

Li Chunfeng's face was overjoyed, and he said, "Is what Master Hou said true?" ”

Li Zexuan smiled: "Naturally, take it seriously! If Ben Hou's prediction is correct, the Taoist chief probably wants to borrow a telescope to derive the calendar, right? Since ancient times, the calendar has been extremely important for the people's agricultural affairs, if this telescope can help the Taoist, it is also the blessing of Yanhuang Academy and Benhou, isn't it? ”

Li Chunfeng's face was solemn, and he sincerely bent down and bowed: "Hou Ye understands the righteousness, and the poor Tao admires it so much, the people of the world will definitely thank Hou Ye for your kindness!" ”

Li Zexuan expected it to be true, the main purpose of his coming here today was to see if the astronomical telescope of Yanhuang Academy could help him improve the accuracy of calendar deduction.

The so-called calendar, simply put, is the law of measuring long time intervals, judging climate changes, and predicting the coming of seasons according to the natural laws of celestial changes. The lunar calendar is based on the cycle of the moon's full and waning phases (i.e., synodic months), and the calendar based on the earth's cycle around the sun (i.e., the return year) is called the solar calendar.

The ancient Chinese calendar used the return year as the unit of the year and the synodic month as the unit of the month, which is a lunisolar calendar that takes into account both the solar calendar and the lunar calendar.

As soon as the rulers of the previous dynasties ascended the throne, they generally organized officials to overhaul the calendar, because the people's annual agricultural activities such as spring ploughing and autumn harvest all refer to the calendar, and the importance of the calendar to the country can be seen!

Many people who have learned about the Chinese lunar calendar may sigh in their hearts, why are the 24 solar terms in the lunar calendar that have existed for thousands of years predicting agricultural affairs so accurate? At the beginning of spring, we should start to cultivate the land and raise seedlings, the rain should weed the wheat, the sting should be topdressed to the wheat, and the wheat will be jointed during the spring equinox, etc.! And every Mid-Autumn Festival, I have never found that the moon has ever been unround. It has been in action for thousands of years, and the creator of the calendar and the discoverer of the law can't help but admire the five bodies to the ground.

In comparison, the Gregorian calendar, which is common in all countries of the modern world, is simply weak!

In fact, the Chinese lunar calendar is based on the pure solar calendar "24 solar terms" to determine the leap month, leap year, and the etheric yin to determine the month. The 24 solar terms are pure solar calendars, so the prediction of agricultural time is very accurate. Therefore, the Chinese lunar calendar is a solar calendar with a solar calendar to correct the cycle.

The 24 solar terms are pure solar calendars, and its cycle is the same as the earth's orbital cycle. From Earth, the moment the Sun passes through the vernal equinox on the ecliptic is the beginning of the new year and the end of the old year. In ancient dynasties, the Qin Tianjian was set up to observe and correct every year to ensure the accurate positioning of the vernal equinox and the accuracy of the agricultural time.

Li Zexuan felt that giving the telescope to Li Chunfeng belonged to giving the sword to the hero, so that Li Chunfeng might be able to improve the calendar, which was a big event for the benefit of the country and the people! And if Li Chunfeng discovers the eight planets of the solar system through a telescope and proposes a heliocentric theory or solar system theory, it can be regarded as a contribution to the astronomical cause of the Tang Dynasty, isn't it~?

"Okay, you're a Yong'an Hou~! I didn't know what conspiracy you used to make Doctor Sun move to Yunshan, and now you want to borrow this telescope to dig up my people~? ”

The two were talking happily, and they had a posture of hating each other, but Li Er walked over from the side and didn't have a good air.

He has seen people very accurately in his life, and Li Er still has great hopes for Li Chunfeng.

"The minister is afraid, the minister Li Chunfeng will always be loyal to His Majesty and loyal to the Tang Dynasty~!"

Maybe Li Er is a joke, but Li Chunfeng has not been in contact with Li Er for a long time, and he doesn't know much about Li Er's character.

Li Zexuan didn't have any fear, he immediately heard that Lao Li was joking, so he reluctantly arched his hand: "Your Majesty, the minister wants to use the technology of the academy to help Li Shilang improve the calendar, and the minister and the others do things for Your Majesty, the Tang Dynasty, and the people, so why talk about poaching people?" ”

This, although Li Zexuan does have that idea in his heart, it is impossible for him to say it!

…………………………………

First update!

(End of chapter)