This study analyzes the characteristics of the Angbu-ilgu, a Korean sundial resembling a concave hemisphere, which was crafted in 1434 during the sixteenth reign of King Sejong (r. 1418–1450) of the Joseon Dynasty, although no remains of it exist today. We draw upon historical documents, such as the Sejong-Sillok (Veritable Records of King Sejong), Donggyeong-Jiji (Chorography of the Joseon Dynasty), and Yuanshi (History of the Yuan Dynasty), as well as related extant relics. The primary features of King Sejong’s Angbu-ilgu were as follows. First, celestial-circumference degrees were intricately engraved along the meridian line. Second, 12 double-hours were represented by images corresponding to their respective animal divinities. Third, a plate was affixed to the end of the gnomon, which stood perpendicular to the alidade, serving as a handle, rotated along two axes, and included a pinhole. Fourth, the diameter of the hemisphere measured 414 mm, approximately 1.5–2.1 times larger than extant Angbu-ilgu relics. Finally, four pillars supporting the Angbu-ilgu were positioned at four cardinal points. In conclusion, this study holds significance for restoring the Angbu-ilgu from the era of King Sejong.

1. 서론
2. 현존 유물
    2.1 조선후기 현존 유물
    2.2 구성과 명칭
3. 문헌 분석
    3.1 세종실록
    3.2 『동국지지』
    3.3 『원사』 「천문지
4. 기능적 특징
    4.1 경(經) - 자오선
    4.2 원거(圓距)
    4.3 겨자씨 구멍 - 바늘구멍
    4.4 시신(時神)
5. 외형적 특성
    5.1 크기와 눈금
    5.2 기둥의 방향
    5.3 석대 유물
6. 결론
ACKNOWLEDGMENTS
REFERENCES

• 민병희(한국천문연구원, 충북대학교, 과학기술연합대학원대학교) | BYEONG-HEE MIHN (Korea Astronomy and Space Science Institute, Daejeon 34055, Korea, Chungbuk National University, Cheongju 28644, Korea, Korea National University of Science and Technology, Daejeon 34113, Korea) Corresponding author
• 이기원(대구가톨릭대학교) | KI-WON LEE (Daegu Catholic University, Gyeongsan 38430, Korea)
• 박지원(충북대학교) | JIWON PARK (Chungbuk National University, Cheongju 28644, Korea)
• 김상혁(한국천문연구원) | SANG HYUK KIM (Korea Astronomy and Space Science Institute, Daejeon 34055, Korea)