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East Palace, Prince's Mansion!

Li Chengqian was playing chess with Lu Ziqian with nothing to do. Pen "Fun" Pavilion www.biquge.info

The two dragons in black and white on the chessboard fought extremely fiercely.

Li Chengqian's last false accusation against Du He aroused Li Shimin's monstrous anger, and after giving him a slap in the face, he immediately locked him up and confined him, telling him to think about it behind closed doors and reflect on it. Such a punishment seems to be insipid and tolerant, but it is not. As far as Li Chengqian himself is concerned, such a punishment is more serious than beating him with 50 boards and beating him half to death.

Because he is the crown prince, the crown prince is the future crown prince, in order to exercise the prince's ability to govern the country, the emperors of all dynasties will hand over some government affairs to the prince for approval, so that the prince can discuss with his ministers, and the emperor judges the prince's level of governance from the chapter.

In the past, although Li Shimin did not like Li Chengqian's actions, he treated him as a prince, and asked him to help deal with some state affairs every day, and then wrote comments.

But this confinement, and the daily handling of him have also been broken, which means that he is no longer able to perform the power of the prince at this moment.

This is fatal for a prince.

Lu Ziqian presented Du He's incriminating evidence, although he slapped himself, but Li Chengqian did not have any dissatisfaction with Lu Ziqian, but took it even more seriously, but just blamed all the faults on Du He and Li Shimin, secretly hated Li Shimin for being unfair, and hated Du He for letting him taste tragedy again.

"His Royal Highness the Prince, Du He is back." A guard from the Prince's Mansion walked into the main hall and told Li Chengqian.

The white child in Li Chengqian's hand fell on the chessboard, and a flash of hatred flashed in his eyes when he heard the news, "Back?" Can you see clearly? ”

The guard affirmed: "The subordinates have seen it with their own eyes, there will be no fake, he took a peasant to the camp where Zuo Weiwei was stationed." ”

"Mr. Lu, what do you think?" Li Chengqian asked Lu Ziqian for advice.

Lu Ziqian put the sunspot at the key point and said: "His Royal Highness the Crown Prince should be restless, if that Gongsun Yeyue is really hidden by Du He, and he returns from a long trip, the first thing is to go to Gongsun Yeyue to determine whether she is okay." As long as we follow him, we can find out the whereabouts of Gongsun Yeyue, and then Du Ho will be guilty of harboring the assassins, and even if His Majesty has the intention to help, there is nothing he can do. If this matter has nothing to do with Duhe, then two or three months have passed, and Gongsun Yeyue is estimated to have escaped from the palace in a unique way. However, according to my calculations, it is impossible for Gongsun Yeyue to escape, and even if there is, there must be internal help, and Du He is the most likely. ”

Li Chengqian sneered: "I understand, I will let people keep an eye on Du He's every move, and we must find out the evidence of his collusion with Gongsun Yeyue, and then see how my father is favoritism." ”

After Du He entrusted Xue Rengui to Luo Tong, he planned to go to see how Gongsun Yeyue was doing, and he had been gone for nearly a month. I was a little worried about her safety, but I don't know if others noticed it.

This walked on the way to the palace, but it gave birth to a sense of vigilance.

After thinking about it, he gave up this idea, and secretly thought: I am very fragrant in the court, but it will also attract the jealousy of some narrow-minded people. He and Li Chengqian are incompatible, and the guy is waiting to grab his handle. There seems to be a powerful strategist under his command who once doubted himself, and if that strategist had doubts, he would have sent someone to spy on him.

Li Chengqian is half the master of the palace, and although he is locked up, it is easy to find someone to keep an eye on him and inquire about his whereabouts.

Going to Hongwen Hall too often is too easy to attract people's attention, and it is not a good thing for himself and Gongsun Yeyue.

Now that he has gone out, he will immediately go to Hongwen Hall, and he will be suspected in the eyes of those who have a heart.

Now, after many years of court career, he has a vigilant heart in life, and only by taking every step can he laugh at the end.

After a slight groan, he continued to walk, but the target was no longer Hongwen Hall, but the Science and Technology Institute, to check whether the last process of the compass had been completed.

He didn't know that this cautious step not only saved Gongsun Yeyue, but also saved him from a dilemma.

Du He arrived at the Institute of Science and Technology and directly found the steward in charge of researching the compass, who was also a technical master.

This technical master who is responsible for studying the compass is none other than Li Chunfeng, the famous second god stick of the Tang Dynasty.

Speaking of this, Li Chunfeng is also famous in the Tang Dynasty, he is only thirty-seven years old this year, not yet forty, but he is the second person in Taoism, as famous as Yuan Tiangang, is an outstanding astronomer, mathematician, especially proficient in astronomy, geography, Taoism, yin and yang and other arts.

As early as the early years of Zhenguan, Li Chunfeng emerged in the Li Tang Dynasty, he improved the astronomical armillary sphere invented by the Han Dynasty "Luoxiahong" (personal name), and added the three rings of the ecliptic, equator and white channel, making astronomical observation more convenient and accurate, and it was the most advanced astronomical observation instrument in the world at that time.

This astronomical armillary sphere is similar to the compass, both of which use delicate instruments to distinguish the tiny values of observations, making the instruments more accurate. The only difference is that an astronomical armillary sphere is used in astronomy and is an instrument that measures celestial bodies, while a compass measures direction.

The reason why the compass appears in the world is also because ancient astronomers engraved the stars in the sky, everything represented by the five elements on the earth, and the heavenly and terrestrial branches. Some astronomers use the rotation of a magnetic needle to find a specific direction or time.

Although the concept of "magnetic field" is not mentioned in ancient astronomy, the coordination of direction, orientation, and interval between the circles on the compass implies the law of "magnetic field".

Therefore, the production of this compass also requires a lot of astronomical knowledge. At this point, Li Chunfeng is the first in Datang.

At the beginning, when Duhe was worried about the production of the compass, he needed a lot of astronomical knowledge. Ancient astronomical knowledge is esoteric gossip and twelve earthly branches, and Du He has never been in contact with them, so he found the Taishi Bureau. The Taishi Bureau was in charge of astronomy, geography, calendar-making, and history revision, and Li Chunfeng arranged for Li Shimin to be in charge of astronomy and astronomy in the Taishi Bureau because he improved the Tang calendar, and he happened to meet Du He.

Du He also decisively used his authority, dug down the foot of the wall of the Taishi Bureau with a hoe, dug Li Chunfeng over, and became the head of the compass.

Li Chunfeng is indeed extraordinary, it should be said that it is really amazing.

In ancient times, it was impossible to distinguish the direction very finely. The direction can only be described in eight major directions: north, northeast, east, southeast, southwest, southwest, west, and northwest. According to Du He's prompt, Li Chunfeng used eight trigrams to replace these eight directions, namely Kan hexagram for the north, Gen hexagram for the northeast, Zhen hexagram for the east, Xun hexagram for the southeast, Li hexagram for the south, Kun hexagram for the southwest, Hui hexagram for the west, and Qiangua for the northwest. Subsequently, the ground plane was divided into 12 equal parts, and the 12 earthly branches: Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, and Hai were used to indicate the direction, and the division of the direction scale was greatly refined. A small compass contains the nine palaces, eight trigrams, and twelve earthly branches, full of the endless wisdom of the ancients.

Before Du He left, the direction scale of the Nine Palaces Bagua and the Twelve Earthly Branches had been formed, and only the debugging of the magnetic needle remained. The compass is used at sea, the more accurate the better, and the magnetic needle is the last process, and it is also the easiest, but the most important and critical. His request was that the commissioning be completed before he returned.

Now that he is back, the final adjustment of the compass has not been completed.

"Your Excellency!" Li Chunfeng heard Du He's call, smiled and said with a smile: "According to the instructions, the pointer of the last process of the compass has been debugged, and the compass has been officially developed!" ”

"Great!" Du He clenched his fists, took the world's first compass handed by Li Chunfeng, and tried to turn his body to test the direction, under the direction of the north and south needles, up to the nine palace gossip, as small as the corresponding direction of the twelve earthly branches, at a glance.

"With this sea weapon, I Datang will run rampant in the sea, and I will have no scruples! Daochang Li, this invention of the compass can be regarded as a merit! Du Ho carefully placed the compass on the table, and could not hide his joy, the ship had been successful, and the experienced captain had found it, and now even the compass was ready, everything was in place, everything was in a good direction, and the sea trade was ready to begin.

Li Chunfeng said: "These are all the work of adults, I just do it according to the wishes of adults, where is the credit compared, don't make fun of me." Being able to learn a little bit of single-mindedness from adults is what Xiaodao dreams of. ”

Du He didn't know anything about astronomy and geography, but he knew some basic common sense, which the Tang Dynasty did not possess thousands of years ago.

Just when Du He was talking to Li Chunfeng, Wu Meiniang ran into a lot of trouble.

Wu Meiniang was tired all the way, and after returning home, she greeted her mother Yang and her little sister Jing Niang, and then went to bed and lay down for a while.

After sleeping for about an hour, I vaguely heard the argument between Yang and Wu Jingniang.

"Mother, the second sister is back, tell her about it. Those two bastards are white-eyed wolves, they can't live at all, and they won't stop unless they give them all the property of our martial arts family. Wu Jingniang's words were full of anger and dissatisfaction.

"Girl...... Don't be big or small, what are they saying that they are also your eldest brother and second brother, how can they ignore it like this! Yang's tone was heavy, but he didn't mean to blame, just full of helplessness.

Wu Jingniang raised the decibel and said: "I don't have such a bastard brother, they forced us to leave our hometown back then, how much suffering we suffered, how many sins we suffered." Now that we are developed, we want to get a piece of the soup, and dream of it! Hmph, with the second sister here, I don't believe what they can do to us. ”

"Crunch!" With a bang, the door opened!

Wu Meiniang walked out with a blue face: "Mother, little sister, what are you talking about?" Wu Yuanqing and Wu Yuanshuang came to the door? ”