Question: For a wise king, which achievement can go down in history?
Answer: Including but not limited to the following:
He opened up new territories, enshrined Mount Tai, compiled literary anthologies, and revised the calendar.
Li Heng should not think about opening up new territories. It would be great if he could regain the original territory of the Tang Dynasty.
Fengchan Taishan, the Shandong area is still in the battle between the Tang Dynasty and the Puppet Yan. It is estimated that Li Heng will be sprayed to death by the officials if he brings it up.
"Book of Jin" had been compiled by Fang Xuanling during the reign of Emperor Taizong. As for the anthology, Li Yan did not have the time to compile it.
Then all that’s left is to reset the calendar!
The calendar is the most fundamental law of the entire dynasty.
In an agricultural society, the calendar is not only used to calculate dates, but also a guide to guide agricultural production.
As Li Longji's next emperor, Li Heng is undoubtedly more miserable.
If there had not been the Anshi Rebellion, or if Li Longji had died earlier, he would have been a wise and powerful emperor.
Li Longji did a great job in opening up territories and expanding the territory of the Tang Dynasty, and also expanded the territory of the Tang Dynasty to a level that later generations could not reach.
Li Longji also did it to enshrine Mount Tai. In the thirteenth year of Kaiyuan, under the auspices of Prime Minister Zhang Shuo, Li Longji, Emperor Xuanzong of the Tang Dynasty, led hundreds of officials, noble relatives and leaders of various barbarians to set out from the eastern capital to enshrine Mount Tai.
Li Longji even reset the calendar.
The calendar currently implemented in the Tang Dynasty is called the Dayan Calendar, also known as the "Kaiyuan Dayan Calendar".
He was a famous mathematician and astronomer during the Emperor's period. Seng Yixin wrote it with reference to the "Jiuzhi Li".
It was named because the legislation was based on the number of Xiang Dayan in the Book of Changes. One group measured the latitude of various places, from Jiaozhou in the south to Tiele in the north, and took nine sundials to determine the number of eclipses in each place, and then measured the movement of stars.
However, the Dayan Calendar has been implemented to this day, and deviations have occurred due to original accuracy issues.
Wei Yuan's suggestion was to revise a more accurate astronomical calendar and submit it to the emperor.
Li Yan couldn't help but applaud this proposal!
Li Yan knew very clearly what his father needed.
Living in the shadow of the emperor for most of his life, Li Heng spent the second half of his life wiping Li Longji's butt.
It was clearly Li Longji who had ruined the country, but Li Heng was asked to regain it bit by bit.
The emperor did everything he could. Even if Li Heng quelled the Anshi Rebellion, what could he do? His health was not good, and he couldn't even think about opening up new territories and enshrining Mount Taishan.
Li Yan knew that his father would be very happy to receive this gift.
Because this is something beyond the emperor!
Re-revising the calendar of the Emperor's period would reflect the renewal of everything more than changing a year's name!
Moreover, resetting the calendar is something that only a powerful dynasty can do.
Calendar is not only a mathematical problem, but also an astronomical problem.
In order to revise the Dayan calendar, the emperor established dozens of astronomical observation stations from Jiaozhou in the south to Mobei grassland in the north.
These observation stations measured the positions of the stars, calculated the times of their rising and setting, and drew star maps. Finally, they were all sent to Chang'an, where, under the leadership of the monks, they calculated a Dayan calendar.
It can be said that this is a systematic project that can only be carried out by the prosperous dynasty.
In ancient times, when communication conditions were average and observation levels were very backward, revising etiquette was indeed a huge and complex systematic project.
Yixing began to revise the calendar in the ninth year of Kaiyuan. When Yixing passed away in the fifteenth year of Kaiyuan, the Tang Dynasty gathered astronomers and mathematicians from all over the country to calculate the manuscripts left by Yixing. It was not promulgated until the seventeenth year of Kaiyuan.
But the emperor will move back to Chang'an soon. Is there enough time?
Wei Yuan also provided an answer to this question, and there is enough time.
The most important thing about the calendar is the period of the earth's revolution, and players naturally know this number.
Nowadays, players are in the south and north of the world, especially the distance from Longyou to Liaoxi. Players along the way only need to take pictures of the stars for Wei Yuan, and he can re-create a ritual based on the stars.
Moreover, Wei Yuan did not intend to create etiquette as sophisticated as modern times. His goal was to create a etiquette as sophisticated as the Yuan Dynasty time-telling calendar.
The time calendar has been used for more than three hundred years, and its accuracy is almost the same as the modern Gregorian calendar, which is enough for the Tang Dynasty to use today.
The plan can be implemented. It only requires players distributed across the country to provide astronomical observation data, and Wei Yuan can compile a more accurate and practical calendar.
Replacing the old calendar with a new calendar also shows that the new emperor has ascended the throne. My father will definitely like such a gift!
However, things like revising the calendar still had to be reported to the emperor.
After all, the calendar is the most fundamental matter of the country. My father can appoint King Jianning to do it, but it is not good to do it privately.
As long as the revision is successfully presented to the emperor, the credit belongs to the father.
Thinking of this, Li Yan immediately contacted Shang Bo, who stayed in the backyard of Fengxiang Mansion, and asked him to ask the emperor for authorization.
According to rumors from the Fengxiang Mansion, moving back to Chang'an is a big project. The emperor will definitely have to wait for all the officials to return to Chang'an and settle down, and the Daming Palace will be cleaned and repaired before returning to Chang'an.
This calculation will take at least two months.
Report now and give gifts when you move back to Chang'an, which is about the same time as Wei Yuan planned.
Shang Bo quickly found Prime Minister Pei Mian and submitted King Jianning's memorial to the emperor directly through Zhongshu's family.
"My son wants to revise the calendar?" Li Heng was stunned when he saw his son's memorial.
When the Dayan Calendar was promulgated, Li Heng was not yet the prince, but he was already an adult by then.
But the grand occasion of the promulgation of the Dayan Calendar at that time is still imprinted in Li Heng's mind.
Qin Tianjian cast a golden armillary sphere and forty-nine golden timepieces.
The Dayan Calendar uses the Dayan number forty-nine as a basic unit and eight years as a timing cycle.
When the calendar was promulgated, Chang'an City held a grand celebration ceremony.
Li Longji personally prayed to God and his ancestors, reported that the calendar was completed, and also pardoned criminals who were under death penalty, and the whole world celebrated.
Then Li Longji held a three-day and three-night banquet in the Huacalyx Tower. The promulgation of the Dayan Calendar was also one of the indelible symbols of the prosperous Kaiyuan era.
Li Heng couldn't help but feel excited, but he still asked Prime Minister Pei Mian:
"Is it necessary to rebuild the new calendar?"
Pei Mian also did his homework, and he immediately said: "Although the Dayan calendar is good, starting from the Tianbao period, the Tiantai of various regions has been gradually abolished, and now there are many fallacies."
"The estimated time of the lunar eclipse last month was off by a full hour, and the dates of the winter solstice and autumnal equinox were also incorrect."
Li Heng had the idea of revising the new calendar since he saw his son's memorial. Hearing what the prime minister said, Li Heng felt better.
But he still asked: "Would it cost too much money to build the New Calendar? It took the Emperor half a year to complete the Dayan Calendar. How long will it take for the New Calendar?"
Li Heng's health is not very good. If he waits for another eight years, he might not be able to survive until the new calendar comes out.
Pei Mian said: "I heard that the materials for compiling the Dayan Calendar are still there, and that King Jianning found a prodigy in arithmetic in the Western Regions. He said he could complete the New Calendar before returning to Luan Chang'an."
All the memorials submitted by the officials had to go through the Political Affairs Hall, and Pei Mian had read the detailed memorials.
Li Heng was reminded by Pei Mian and saw the detailed time and plan listed by Li Yan at the back.
He smiled and said: "My son has such a loud voice!"
Li Heng only felt that his son was bragging to him, but he still received the kindness.
He said to Pei Mian: "Since my son has this filial piety, let Hanlin draft the edict and let King Jianning preside over the revision of the new calendar."
Then Li Heng said: "There is no need to rush back to Luan Chang'an to complete the revision. The new calendar is more accurate than the Dayan calendar."
Pei Mian immediately said: "I obey the order."
Wei Yuan, a player in the thirteenth test, wrote to King Jianning to suggest revising the calendar. This suggestion was adopted by King Jianning.
The news spread all over the player forums at once!
Then came another new news: King Jianning spent money to help Wei Yuan build an observatory outside Jiuquan City.
At the same time, observatories were also built in Mobei, Modong, and Liaoxi.
And those players who were wandering outside Longyou also received new tasks.
[Special Mission: Observing the Starry Sky]
【The greatest thing in the world is the vast sky above our heads.】
[Follow the game prompts and provide daily starry sky observation data. Make a simple device to calculate the time of sunrise and sunset. 】
[Task Reward 1: Players who complete the task can obtain professional experience rewards. 】
[Task reward 2: Rare title—Star Observer and corresponding forum badge.]
I have to say, this is the simplest task.
Players other than Longyou only need to go online regularly every night, take pictures of the star map above their heads, mark the positions of important stars, and upload it to the forum.
For these adventure players, it can be said that they can be completed easily, and they can receive rewards immediately after completion.
This is probably the easiest task to get a title. As soon as the task was sent out, it immediately received a large number of responses from players, and a massive amount of data was sent to the forum.
For Wei Yuan, this is not a very difficult job.
As a mathematician, mathematical analysis and processing of data is just the simplest job.
Formulating a calendar is actually about calculating the earth's revolution period and determining the earth's rotation speed through changes in the positions of stars in the sky.
For Wei Yuan, such problems can only be regarded as relatively challenging.
The reason why the Dayan Calendar is so time-consuming is because Yi Xing spent too much time looking for the "Shangyuan Product Number".
The Shangyuan product number is the "beginning of heaven and earth" that ancient astronomers were looking for.
It is also the day when the calendar begins as prescribed by astronomers. The number of ascendants calculated in one line is the day when the five stars in a row align the sun and the moon in the same orbit.
In order to calculate this upper element product, one line spent too much time.
But for Wei Yuan, the Shangyuan product has no meaning at all.
He directly took the year when the First Emperor destroyed the six kingdoms and unified the world as the first year of AD, which was the starting point of the calendar.
This calendar is directly based on the time calendar of Guo Shoujing of the Yuan Dynasty, with 365.2422 days as one year. The accuracy is equivalent to the Gregorian calendar currently in effect around the world.
Wei Yuan recalculated the dates of the winter and summer solstice for the next hundred years, and calculated the times and locations of several major solar and lunar eclipses.
Li Yan was overjoyed when he saw this new calendar. This would be the best gift ever given to the emperor when he returned to Luan Chang'an!