The life and astronomical activity of Lee Deok-Seong (李德星, 1720-1794) was studied using various historical sources, including the astronomical almanac, Seungjeongwon-Ilgi (Daily records of Royal Secretariat of Joseon dynasty), and the Gwansang-Gam's logbooks during Joseon dynast...
The life and astronomical activity of Lee Deok-Seong (李德星, 1720-1794) was studied using various historical sources, including the astronomical almanac, Seungjeongwon-Ilgi (Daily records of Royal Secretariat of Joseon dynasty), and the Gwansang-Gam's logbooks during Joseon dynasty (A.D. 1392-1910). We present the results of the study including the following main findings. First, from the investigation of Lee's family tree, we find that a number of his relatives were also astronomers, notably Samryeok-Gwan (三曆官, the post of calendrical calculation). Second, we find that he took part in the compilation of an annual astronomical almanac over a period of at least 16 years. His major achievements in the astronomy of the Joseon dynasty were to establish a new method of calendar-making calculation and to bring astronomical materials to the Joseon court through a visit to China. The Joseon dynasty enforced the Shixianli (時憲曆, a Chinese calendar made by Adam Shall) in 1654 without fully understanding the calendar. So an astronomer and an envoy were dispatched to China in order to master the intricacies of the calendar and to learn as much of Western science as was available in that time and place. Lee Deok-Seong worked at the Gwansang-Gam (觀象監, Royal Astronomical Bureau) during the reigns of King Yeongjo (英祖) and Jeongjo (正祖). As best as we can ascertain in relation with the calculations in the Shixian calendar, Lee visited China four times. During his trips and interactions, he learned a new method for calendar-making calculations, and introduced many Western-Chinese astronomical books to Joseon academia. Lee greatly improved the accuracy of calendrical calculations, even while simplifying the calculation process. With these achievements, he finally was promoted to the title of Sungrok-Daebu (崇祿大夫), the third highest grade of royal official. In conclusion, history demonstrates that Lee Deok-Seong was one of the most outstanding astronomers in the late-Joseon dynasty.
The life and astronomical activity of Lee Deok-Seong (李德星, 1720-1794) was studied using various historical sources, including the astronomical almanac, Seungjeongwon-Ilgi (Daily records of Royal Secretariat of Joseon dynasty), and the Gwansang-Gam's logbooks during Joseon dynasty (A.D. 1392-1910). We present the results of the study including the following main findings. First, from the investigation of Lee's family tree, we find that a number of his relatives were also astronomers, notably Samryeok-Gwan (三曆官, the post of calendrical calculation). Second, we find that he took part in the compilation of an annual astronomical almanac over a period of at least 16 years. His major achievements in the astronomy of the Joseon dynasty were to establish a new method of calendar-making calculation and to bring astronomical materials to the Joseon court through a visit to China. The Joseon dynasty enforced the Shixianli (時憲曆, a Chinese calendar made by Adam Shall) in 1654 without fully understanding the calendar. So an astronomer and an envoy were dispatched to China in order to master the intricacies of the calendar and to learn as much of Western science as was available in that time and place. Lee Deok-Seong worked at the Gwansang-Gam (觀象監, Royal Astronomical Bureau) during the reigns of King Yeongjo (英祖) and Jeongjo (正祖). As best as we can ascertain in relation with the calculations in the Shixian calendar, Lee visited China four times. During his trips and interactions, he learned a new method for calendar-making calculations, and introduced many Western-Chinese astronomical books to Joseon academia. Lee greatly improved the accuracy of calendrical calculations, even while simplifying the calculation process. With these achievements, he finally was promoted to the title of Sungrok-Daebu (崇祿大夫), the third highest grade of royal official. In conclusion, history demonstrates that Lee Deok-Seong was one of the most outstanding astronomers in the late-Joseon dynasty.
조선 전기 세종은 정흠지, 정초, 정인지를 통해 수시력(授時曆) 계열의 역법 연구를 시작하였고, 이순지를 통해, 김담과 더불어 회회력법도 정리하며 ‘칠정산’을 완성하였다. 세종은 개인의 학구열과 함께 집현전을 통해 이순지, 김담이라는 천문 엘리트를 육성하여 왕권 주도의 천문역법을 개발하였다. 그러나 조선 중기와 후기에는 기존의 사용하던 역법이 실제 현상과 조금씩 어긋나고 청력(淸曆)과도 달라짐에 따라 어쩔 수없이 당시 청에서 사용하던 시헌력을 받아들이게 되었다.
칠정산은 어떻게 만들어졌는가?
, 2010). 조선 전기 세종은 정흠지, 정초, 정인지를 통해 수시력(授時曆) 계열의 역법 연구를 시작하였고, 이순지를 통해, 김담과 더불어 회회력법도 정리하며 ‘칠정산’을 완성하였다. 세종은 개인의 학구열과 함께 집현전을 통해 이순지, 김담이라는 천문 엘리트를 육성하여 왕권 주도의 천문역법을 개발하였다.
조선 중기와 후기에 기존의 천문역법을 버리고 새로운 천문학을 받아들인이유는 무엇인가?
세종은 개인의 학구열과 함께 집현전을 통해 이순지, 김담이라는 천문 엘리트를 육성하여 왕권 주도의 천문역법을 개발하였다. 그러나 조선 중기와 후기에는 기존의 사용하던 역법이 실제 현상과 조금씩 어긋나고 청력(淸曆)과도 달라짐에 따라 어쩔 수없이 당시 청에서 사용하던 시헌력을 받아들이게 되었다.
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