과학문화교육의 연구와 저술
Night time system in Nuju-gongui during early Joseon Dynasty
Dual time keeping system was used in Joseon Dynasty. One is the twelve Jin (辰) system which is divided into 12 hours in a day. The other is the unequal time system named Gyeongjeom which is separate into five intervals during the night time. The night time is defined as duration between 2.5 Gak (刻) after sunset and 2.5 Gak before sunrise. Of cause the interval of one day is used as 100 Gak in early Joseon Dynasty till the year in 1653 (Hyojong 4th year) reformed calendar system. We study on the Gyeongjeom system (更點法) that is appeared in the Nuju-tongui. The book was used as comparing the 12 Jin system with Gyeongjeom for managing the clepsydra in night time. We analyze the time keeping system of night time in Nuju-tongui and meridian transit time of constellations named 28-Su at the morning and evening twilight time in each 24 seasons.
(영문으로 된 논문 전체가 첨부에 있습니다. 편집 머슴)
이용복, Lee, Yong Bok