Personally, I think Yuan Tianshi is amazing! Li Chunfeng was proficient in astronomy, mathematics, calendars, meteorology, etc.
1. He improved the astronomical armillary sphere invented by Luo Xiahong in the Han Dynasty and added three rings of the ecliptic, equator, and ecliptic (known as the Three-Chen Sphere in ancient times), making astronomical observations more convenient and accurate , was the most advanced astronomical observation instrument in the world at that time. The armillary spheres made after the Tang Dynasty all imitate this structure, and the ancient armillary sphere copied by Nanjing Purple Mountain Observatory also imitates this structure.
2. He was ordered to preside over the promulgation of "Zhou Bi Suan Jing" and "Ten Classics of Ancient Suan Suan" as national textbooks with Liang Shu, a doctor of Chinese arithmetic, Wang Zhenru, an assistant professor of Taixue, and others. They are the earliest in the world. Mathematics textbooks had a huge and far-reaching influence on later generations of Eastern mathematics. China, Japan, North Korea, Vietnam and other countries have continued to use it until modern times. Dr. Joseph Needham called it: "the greatest annotation of mathematical works in the entire history of China."
3. When he was 25 years old, he submitted a letter to improve the "Wuyin Yuanli". Tang Taizong personally presided over the expert review and finally adopted Li Chunfeng's seven suggestions.
4. While living in seclusion in Chunfeng Village, he used the "three-legged chicken wind mark" he designed to observe and measure the wind, and set the wind at level eight, becoming the first person in the world to measure the wind. According to the ancient scientists who rated the wind, 1,000 years later, European talents refined the eight-level wind set by Li Chunfeng into a thirteen-level wind.
Yuan Tiangang is proficient in Feng Shui, astronomy, astrology, prediction of unknowns, magic, etc.
1. "New Book of Tang" also records: At that time, Gao Shilian watched Yuan Tiangang read fortunes for others. The prediction was very accurate, so I asked Yuan Tiangang what kind of official he expected to be in the end. Yuan Tiangang thanked him and said: "I know my destiny, and by April this summer, my Yang number will be exhausted." Sure enough, he died in the position of "Volcano Order" as expected. In the "Old Book of Tang", it is recorded that the "Huoshan Order" where Yuan Tiangang served was the "Huojing Order". Whether it is the "Huojing Order" or the "Huojing Order", it is difficult to verify who the official was. It is speculated that the official responsible for divination, witchcraft and blessings should belong to the "clerical" category of the palace.
2. Yuan Tiangang also had works on arithmetic and numbers handed down from generation to generation. The hexagram book "Nine Heavenly Mysteries Liu Ren Ke" was already very popular in the Song Dynasty. According to the textual research of Ji Xiaolan in the Qing Dynasty's "Sikuquanshu·Cunmu" It was written by Yuan Tiangang.
3. Yuan Tiangang often observed the stars with his disciples in the Star Observation Tower. Every time he watched the stars, Yuan Tiangang understood the mystery deeply.
4. It is said that Wu Zetian once asked Li Chunfeng and Yuan Tiangang to explore and select the dragon cave in the cemetery for her. First, Li Chunfeng ran for ninety-nine and eighty-one days, found the auspicious soil of Dragon Cave in Xiaoliang Mountain, and buried a copper coin. He then asked Yuan Tiangang to go out to search, and he found this place after seven and forty-nine days, so he pulled a copper coin from his head. Insert the silver hairpin. Wu Zetian asked someone to verify whether the auspicious soil of the dragon cave they chose was consistent. When they dug it up, they found that Yuan Tiangang's silver hairpin was inserted into the square hole of the copper coin. Among the people, Yuan Tiangang is believed to be the star of wisdom in the Tiangang star that descended to earth.