This study investigated the stone Angbu-ilgu (scaphe sundial) of the Korea Meteorological Administration (KMA) and the Seoul Museum of History (SMH). Since the first Angbu-ilgu was produced in Korea in 1434 (the year of the reign of King Sejong), Angbu-ilgu has been reproduced with various materials. The upper surface of these two stone Angbu-ilgus symbolizes the horizon. On the hemisphere concave at the center of the horizon, the South Pole, the time line, and the season line are engraved. On the horizon of both the KMA and SMH Angbu-ilgus, the schematic, typeface, and composition of the inscription completely coincide with each other. In this study, it was estimated that the appearance of the KMA Angbu-ilgu, which was damaged at some point previously at least once, was similar to that of the SMH Angbu-ilgu, and this means that it is superficially similar with Treasure No 840, the stone horizontal sundial. In the concave hemisphere of both the stone Angbu-ilgus of the KMA and SMH, there are hour lines and 24 solar-term lines (13 line), and there is an intersection point where these lines meet the horizon, respectively. It can be verified that these intersections of these two Angbu-ilgus can be calculated as having a latitude of +37°39′15″. The hour lines of the two stone Angbu-ilgus show that they were made after about 1900.

ABSTRACT
1. 서론
2. 유물 분석
    2.1. KMA 앙부일구
    2.2. SMH 앙부일구
3. 절기선과 시각선의 검증
    3.1. 수학적 모델
    3.2. KMA 앙부일구
    3.3. SMH 앙부일구
4. 토의
    4.1. 명문
    4.2. 시각선에 따른 제작시기
    4.3. 원형 석판의 용도
5. 결론
ACKNOWLEDGMENT
REFERENCES

• 김상혁(한국천문연구원) | SANG HYUK KIM (Korea Astronomy and Space Science Institute) Corresponding author
• 민병희(한국천문연구원, 과학기술연합대학원대학교) | BYEONG-HEE MIHN (Korea Astronomy and Space Science Institute, Korea University of Science and Technology)
• 김재영(국립기상박물관) | JAE-YOUNG KIM (National Meteorological Museum of Korea)