It was late at night, but Yu Shu was still awake. An oil lamp was lit on the dining table. The light was as thick as a knuckle, barely illuminating her vision.
"Swish, swish, swish …"
Yu Shu was holding a simple charcoal pencil made from a willow branch in her hand. She was writing rapidly on the coarse paper. Her eyes were bloodshot because of the long night vision. However, at this moment, their owner's face was not filled with exhaustion, but excitement.
"Sister, why aren't you sleeping?" Yu Xiaoxiu turned over and saw Yu Shu still sitting there. He couldn't help but call her. It had been almost half a month. His sister had been working late every day. He didn't know what she was busy with. He had seen the things she wrote on the paper, but they were all talismans that he didn't recognize. She wouldn't tell him when he asked her.
Yu Shu ignored him. She focused all her attention on the calculation in front of her. She wrote faster and faster. She didn't have any extra energy to pay attention to the outside world.
She was in a state of extreme excitement. She had turned from a modern person to an ancient person. This was the first time in a month that she had carried out such a high degree of mental calculation. There was no computer or calculator. She had to rely on her personal calculation ability to operate such complex data calculations. This was an unprecedented challenge for her. Her competitive spirit and unwillingness to admit defeat were all lured out and clamored for her to continue.
The reason why she was like this was all because of the set of Qimen Dunjia that Daoist Qing Zheng taught her ten days ago.
In the House of Yi Xue, the Occult Sect used the Divinatory Disc as the starting point. The Divinatory Disc was based on the Eight Trigrams. The Divinatory Disc was a medium for complex information. It included the Heavenly Stems, Nine Palaces, Eight Gates, and Nine Stars and Eight Gods. This was a divination based on time and space. Because the pattern of every hour of the year was different, the arrangement of time and space information was also different.
For example, using the simplest application of the eight doors of fortune and misfortune, the "life" door of the eight doors could be used to seek wealth and medical treatment. Assuming that on the day of Jiawu in the year of Ren Chou, the "life" door of the eight doors was located at the "ridge" position, which was the west side. If one went west, there was a high chance that one would have good fortune. The book contained the general principle of Qimen Dun Jia, "The Song of the Old Fisherman in Smoke Waves". It had more than 1,600 words, and it taught people the rules of the divination arrangement. However, it was quite troublesome to learn it. In the Sanjue Study House, some students couldn't even memorize it, let alone arrange the divination according to the general principle.
As for the set of incantations that Daoist Qing Zheng taught to Yu Shu, rather than saying they were incantations, they were more like lines of calculations. They were not calculations that were used to perform divination, but formulas that were specifically used to deal with the positions of the Eight Trigrams.
There was no need to arrange them clumsily, and there was no need to prepare eighteen moving plates to calculate a complete hexagram plate. He could calculate whichever position he wanted. It was simple, convenient, and accurate.
Yu Shu was quite surprised to learn such a specialized thing.
Daoist Qing Zheng's original intention was for her to memorize this set of incantations, and then slowly teach her how to calculate. In his words, within three months, Yu Shu would be able to learn the "eight doors of fortune and misfortune" and use it. Three months was much shorter than three years.
However, Qing Zheng had underestimated one thing. Indeed, Yu Shu couldn't even write well. She was a beginner in Yi Xue, but she was an elite in mathematics. The mathematical theory and knowledge that she had mastered far exceeded that of this era by more than four hundred years.
Yu Shu didn't show her surprise in front of Qing Zheng, nor did she refuse his rough guidance. Instead, she copied the set of incantations home. Out of curiosity as a mathematician, she carefully calculated for a few days and came up with a bold hypothesis.
Since there was such a set of calculations to calculate the eight doors of fortune, then all the information in the Occult Door could be substituted into the formula.
The scope of application of the "eight doors of fortune and misfortune" was limited. For example, all the information in the Occult Door could be substituted into the formula.
For this reason, she specially asked Yu Xiaoxiu for advice on a hexagram. She wanted to know how to predict a sunny or rainy day from the hexagram. She used it as an experiment and substituted the incantations taught by Qing Zheng to find a formula to predict a sunny or rainy day. If her hypothesis was correct, then she could deduce a set of her own calculation method. To be more precise, it would be an equation.
This was a crazy hypothesis. If it was successful, she had a hunch that it would be the biggest asset she had in this era. Three months was much shorter than three years.
However, Qing Zheng had underestimated one thing. Indeed, Yu Shu couldn't write well. She was a beginner in Yi Xue, but she was an elite in mathematics. The mathematical theory and knowledge that she had mastered far exceeded that of this era by more than four hundred years.
Yu Shu didn't show her surprise in front of Qing Zheng, nor did she refuse his rough guidance. Instead, she copied the set of incantations home. Out of curiosity, she carefully calculated for a few days and came up with a bold hypothesis.
Since there was such a set of calculations to calculate the eight doors of fortune, then all the information in the Occult Door could be substituted into the formula.
The scope of application of the eight doors of fortune was limited. For example, the prediction of a sunny or rainy day that Yu Shu wanted to know at the beginning could not be calculated.
For this reason, she specially asked Yu Xiaoxiu for advice on a hexagram. She wanted to know how to predict a sunny or rainy day from the hexagram. She used it as an experiment and substituted the incantations taught by Qing Zheng to find a formula to predict a sunny or rainy day. If her hypothesis was correct, then she could deduce a set of her own calculation method. To be more precise, it would be an equation.
This was a crazy hypothesis. If it was successful, she had a hunch that it would be the biggest asset she had in this era. Yu Shu was quite good at reverse calculation. She was especially proficient in statistical probability. She used all her spare time to deduce and record the changes of the weather every day. She made mistakes again and again, and fell into a dilemma again and again. Instead, it boosted her desire for knowledge.
She could definitely succeed!
"Bang!"
Yu Xiaoxiu was drowsy when he suddenly heard a loud noise. He sat up in shock and turned his head. In the dim light, he saw Yu Shu excitedly pounding the table twice, scratching her ears and cheeks. She was holding a piece of paper in her hand with a look of ecstasy on her face.
"Sister?" He put on his shoes and went down. Before he could get close, Yu Shu rushed over and hugged him. She picked him up and spun him twice on the spot. He was so shocked that he almost cried out.
"What's wrong with you?" Although Yu Xiaoxiu did not know what Yu Shu was happy about, he was still infected by her. He hesitantly raised his hand and patted her back before laughing.
"Haha, Xiaoxiu, Xiaoxiu, you don't know. You don't know. Hahaha …" Yu Shu hugged her little brother tightly and vented the joy in her heart. She held the fruits of her labor tightly in her hands.
She finally calculated it. It was an equation to calculate Qingyu. It was accurate and simple. But this was just the beginning. She still needed to collect more calculation rules.
Outside the window, the moon was bright and the stars were sparse. A blind star flashed in the north. Somewhere outside of Yiyang City, someone looked at the sky and frowned.
*
*
*
Yu Shu was so excited that she only fell asleep when it was almost dawn. In the morning, Yu Xiaoxiu did not wake her up. She slept until lunch.
"Sister, sister, don't sleep anymore. Wake up quickly. I have something to tell you." Yu Xiaoxiu sat on the bed and shouted. He did not even put down his bag.
Yu Shu was already awake. She was just lazy in bed and did not want to get up. She turned around and rubbed her eyes. She yawned and asked, "What is it?"
Yu Xiaoxiu took out a piece of paper from his bag and handed it to her. He said in a bad mood, "Xue Wenzhe has recovered from his illness. Tonight, he's treating everyone to a meal at the Drunken Immortal Restaurant. This is an invitation for you."
Yu Shu took it and looked at it. Very good. There were two words that she did not recognize.
Yu Xiaoxiu looked at her expression. "Are you going?"
"Of course." Yu Shu said without thinking. "Of course I'm going. I'm eating and drinking for free. Why not?"
Yu Xiaoxiu lowered his head. "I don't really want to go."
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