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논문 기본 정보

자료유형
학술저널
저자정보
민병희 (한국천문연구원) 이기원 (대구가톨릭대학교) 안영숙 (한국천문연구원) 이용삼 (충북대학교)
저널정보
한국우주과학회 Journal of Astronomy and Space Sciences Journal of Astronomy and Space Sciences 제32권 제1호
발행연도
2015.3
수록면
63 - 71 (9page)
DOI
http://dx.doi.org/10.5140/JASS.2015.32.1.63

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During the reign of King Sejong (世宗, 1418-1450) in the Joseon Dynasty, there were lots of astronomical instruments,including miniaturized ones. Those instruments utilized the technical know-how acquired through building contemporaryastronomical instruments previously developed in the Song(宋), Jin(金), and Yuan(元) dynasties of China. In those days,many astronomical instruments had circles, rings, and spheres carved with a scale of 365.25, 100, and 24 parts, respectively,on their circumference. These were called the celestial-circumference degree, hundred-interval (Baekgak), and 24 direction,respectively. These scales are marked by the angular distance, not by the angle. Therefore, these circles, rings, and sphereshad to be optimized in size to accomodate proper scales. Assuming that the scale system is composed of integer multiplesof unit length, we studied the sizes of circles by referring to old articles and investigating existing artifacts. We discoveredthat the star chart of Cheonsang yeolcha bunyajido was drawn with a royal standard ruler (周尺) based on the unit lengthof 207 mm. Interestingly, its circumference was marked by the unit scale of 3 puns per 1 du (or degree) like Honsang (acelestial globe). We also found that Hyeonju ilgu (a equatorial sundial) has a Baekgak disk on a scale of 1 pun per 1 gak(that is an interval of time similar to a quarter). This study contributes to the analysis of specifications of numerous circularelements from old Korean astronomical instruments.

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