In this paper, we have studied Sogyupyo (小圭表, small noon gnomon) of the Joseon dynasty. According to the Veritable Records of King Sejong (世宗, 1418 - 1450), Daegyupyo (大圭表, large noon gnomon) with a height of 40-feet [尺] was constructed by Jeong, Cho (鄭招) and his colleagues in 1435, and installed around Ganuidae (簡儀臺, platform of Ganui). On the contrary, the details of Sogyupyo are unknown although the shadow length measurements by Daegyupyo and Sogyupyo are found on the Veritable Records of King Myeongjong (明宗, 1545 - 1567). By analysing historical documents and performing experiments, we have investigated the construction details of Sogyupyo including its development year, manufacturer, and installation spot. We have found that Sogyupyo would be manufactured by King Sejong in 1440 and placed around Ganuidae. And Sogyupyo would be five times smaller than Daegyupyo, i.e., 8-feet. On the basis of experiments, we suggest that although it is smaller, Sogyupyo was equipped with a bar [橫梁] and a pin-hole projector [影符] like Daegyupyo in order to produce the observation precision presented in the Veritable Record of King Myeongjong.

ABSTRACT
1. 서론
2. 간의대와 대규표
3. 세종대의 소규표
    3.1. 소규표의 크기
    3.2. 소규표의 제작자와 제작연대
    3.3. 소규표의 설치장소
    3.4. 15세기 조선과 명(明)의 천문의기 개발시기의 비교
4. 세종 소규표의 구조적 특징
    4.1.「세종실록」간의대기의 영부(影符)
    4.2. 표 그림자와 횡량 그림자의 관측
    4.3. 세종 소규표의 횡량과 영부
5. 결론
참고 문헌

• 민병희(한국천문연구원, 충북대학교 천문우주학과) | B.-H. MIHN (Korea Astronomy and Space Science Institute, Chungbuk National University)
• 김상혁(한국천문연구원) | S. H. KIM (Korea Astronomy and Space Science Institute)
• 이기원(대구가톨릭대학교 교양교육원, 한국천문연구원) | K. -W. LEE (Catholic University of Daegu, Korea Astronomy and Space Science Institute)
• 안영숙(한국천문연구원) | Y. S. AHN (Korea Astronomy and Space Science Institute)
• 이용삼(충북대학교 천문우주학과) | Y. S. LEE (Chungbuk National University)