Sejong period, science and technology. The world's best in the 15th century

 Science and technology of the Sejong Dynasty should be properly evaluated in the world's best Sejong period in the 15th century, so in the 15th century, science was inferior to the East because it was before the industrial revolution. Since the 18th century, it has been argued that "science in the Sejong era should be re-examined as an achievement of East Asian science that fills the historical gap between Islamic science and modern Western European science." Dr. Jeon Sang-woon (President of Sungshin Women's University, East Asian Science History) said in a paper titled "King Sejong, who was at the center of 15th-century science history," adding, "The science and technology of the Sejong era should try to be properly evaluated by academia." As evidence, he suggested that according to the "Scientific History Dictionary" compiled in Japan in 1983, 29 major achievements from 1400 to 1450 were recorded in Korea, 5 in China, 0 in Japan, and 28 in all regions other than East Asia. Dr. Jeon presented the contents at the "Scientific and Technological Person of the Month-King Sejong" seminar hosted by the Korean Society of Science and History (Chairman Hwang Sang-ik of Seoul National University) at the Hamchun Hall of Seoul National University Medical School in Daehak-ro, Seoul, on the 9th. "King Sejong, who created and distributed Hunminjeongeum (Hangul) in 1446, is also a linguist who created Hangeul, but is a representative scientist of the Joseon Dynasty who studied science and technology by himself, developed natural science and industrial technology." Dr. Jeon highly evaluated Gojoseon's ancient Hangeul. Sejong devised an idea for an ambitious national project that established the astronomical dynamics of the Joseon Dynasty and suggested it to Jeong In-ji. Sejong ordered to observe constellations based on Hanyang's Arctic altitude and independently develop inverse laws (calendars). An observatory called Daegan was built at Gyeongbokgung Palace, and various observation devices were produced to compile the inside and outside of Chiljeongsan Mountain. Dr. Jeon explained, "In the dynasty era, the calendar was issued by the emperor, but King Sejong's independent calculation of the paradox was against the authority of the Chinese emperor." It is presumed that he tried to avoid disputes in China by attaching the academic title of Astronomical Calculation of the Seven Planet Movement (Chiljeongsan Mountain) to the compiled book without the name of "Mathematical Law." Dr. Jeon also said that during the Sejong period, a study called life science developed today. According to the Agricultural Technology Guidelines, "Farming Direct Theory" (12, 1430) (Sejong 12 and 1430), intensive cultivation technology by organic methods was proposed and effectively distributed to farmers. He also compiled Joseon's representative medical books, Hyangyakjipseongbang (15th year of King Sejong, 1433) and Uibangyuchi (27th year of King Sejong, 1445). This has achieved great results in the field of medicine as a life science along with the independent development of agricultural technology. In addition, natural sciences such as meteorology and geography, printing technology, and industrial technologies such as mass production technology of unknown and Buncheong ware have also developed. Dr. Jeon cited the driving force of the development of science and technology during the Sejong Dynasty ▲ respect for science and practicality ▲ independent technology development efforts ▲ talent training ▲ organizational joint research. Sejong also implemented science and technology policies as a national task and encouraged technological innovation at the national level. Sejong showed enthusiasm for learning to the extent that he learned the representative mathematician book Industry-Academic Enlightenment at that time under the guidance of Jeong In-ji. In fact, the research task given to scholars before collection was given by the national policy regardless of their wishes. In addition, in order to develop printing technology, special remuneration was provided so that the craftsmen of the main station did not worry about the livelihood of their wives, and support such as giving alcohol and meat was spared. In order to make an iron cannon, the two princes were in charge of and supervised the cannon's work and raised the status of general manager of the cannon casting. The science of the reign of King Sejong, which blossomed in this way, is today becoming an important research task for East Asian scientific and technological history and medical history.