키워드열기/닫기 버튼
Cheon-Sang-Yeol-Cha-Bun-Ya-Ji-Do, Joseon Dynasty, celestial planisphere, Donggukmunheonbigo Sangwigo(Study of astronomy and meteorology, Comprehensive study of civilization), Kwansanggam(the Bureau of Astromony and calendrical science), King Youngjo