地転(動)説から宇宙無限論へ : 金錫文と洪大容の世界

Since in 1973 Minn Young-gyu, a professor of Yonsei University, introduced Kim Sog-mun\u27s work "Yoghak-Yisipsa-Dohae" 易学二十四図解 to the world, it has been established that the foremost advocate of the theory of the rotative earth in Korea is not Hong Dae-yong (1731-1783) but Kim Sog-mun (1658-1735). But then has Hong Dae-yong\u27s cosmological theory lost it\u27s raison-detre? This article aims to clarify the relation of their theories and their own contributions. My conclusions are as follows. 1. Under the influences of the astronomical theory of Chang Heng-chu 張横渠 (1020-1077) and Western theory of the rotative earth, introduced critically to China by Jesuits, Kim Sog-mun overthrew the Ptolemaic theory and established the theory of the rotative earth in East Asia for the first time, Though his cosmic world was yet one of the structure of concentric circles, it is an original system in which inner stars revolve round the center of the universe more rapidly than outer ones. 2. Hong Dae-yong\u27s cosmic world is not the one of concentric circles but the infinite universe inheriting from The Hsuan Yeh Teachiny 宣夜説, one of the ancient Chinese cosmologies. He says that the Milky Way is composed of innumerable stars and in the universe there are countless worlds such as the Milky Way. This is an amazingly modern understanding of the infinite universe. 3. Kim Sog-mun performed a great change from the concept of moving celestial bodies and static earth to the one of moving and rotating earth. Hong Dae-yong expanded the horizon to the idea of the infinite universe. They made their own contributions