논문 상세보기
pp.55-63
Gyupyo (圭表, Gnomon) consists of Gyu (圭, Measuring Scale) and Pyo (表, Column), and was one of the traditional astronomical instruments in East Asia. Daegyupyo (Large Gnomon) was manufactured in the Joseon dynasty around 1434 ~ 1435. To increase the measurement accuracy, it was equipped with a Hoengyang (橫梁, Cross-bar) and used a Youngbu (影符, Shadow-Definer) which was invented during the Yuan dynasty (1271 ~ 1368). The cross-bar was installed on the top of the column and this structure was called Eol (臬). In addition, three plumbs hanging from the cross-bar was employed to vertically built Eol on the measuring scale. This method was also used to not only check the vertical of Eol but also diagnose the horizontal of the cross-bar. Throughout this study, we found that a cross-bar in a gnomon has played three important roles; measurement of the shadow length made by the central part of the Sun, increase of the measurement precision using the shadow-definer, and diagnosis of the vertical of Eol and the horizontal of the cross-bar itself using the three plumbs. Hence, it can be evaluated that the employment of a cross-bar and a shadow-definer in a gnomon was a high technology in the contemporary times. In conclusion, we think that this study is helpful for understanding the Large Gnomon of the Joseon dynasty.
1. 서론
2. 고전적 규표와 횡량형 규표
2.1. 고전적 규표와 횡량형 규표
2.2. 고전적 규표의 특성
2.3. 횡량형 규표의 특징
2.4. 대규표 모델
3. 3차원에서의 횡량 설치방법
3.1. 문헌 기록 분석
3.2. 삼점현추법(三點懸錘法)
3.3. 횡량의 진단와 삼점현추법의 활용
3.4. 횡량형 규표의 건설 공정과 대형화
4. 요약
참고 문헌
