• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.707-710
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• 1996

During King Sejong's reign in early Chosen Dynasty, the Korean science had been in full bloom. Among the many splendid achievements of the period, though most of them are not extant, astronomical instruments and clocks made for equipping the Royal Observatory are taken as typical works that reflect the characteristics of the King's scientific projects and discussed in the view point that what and how much a well-planned drive and a future-oriented leader can accomplish.

• 천문학논총
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• 제39권2호
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• pp.69-87
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• 2024

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 We draw upon historical documents, such as the Sejong-Sillok (Veritable Records of King Sejong), Donggyeong-Jiji (Chorography of the Joseon Dynasty), and Yuanshi (History of the Yuan Dynasty),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.

• 천문학논총
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• 제37권3호
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• pp.35-47
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• 2022

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.

• 헤리티지:역사와 과학
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• 제56권4호
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• pp.24-37
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• 2023

본 연구는 2022년에 새롭게 보물로 지정된 앙부일구의 재질과 외형적 특징을 분석하였다. 국립고궁박물관, 국립경주박물관과 성신여자대학교박물관의 세 기관에서 소장하고 있는 보물 앙부일구는 그 재질, 규격, 형태(외형), 은상감 등 제작기법이 쌍둥이처럼 비슷하다. 이 세 점의 앙부일구은 구리: 아연: 납이 90.6: 6.0: 1.8의 비율인 황동으로 제작되어 있다. 이 성분비는 82.2: 3.7: 11.8의 조성비를 가지고 있는 보물 제845호 앙부일구와 분명한 차이를 보인다. 새 보물 앙부일구에서 반구의 받침부분은 용의 문양이 수직기둥에 그려지고 구름의 문양이 기둥의 날개를 형성하여, 반구 지평환에 각각 리벳과 은땜으로 결합되어 있다. 이러한 운룡주(雲龍柱)의 문양은 조선 후기 제작된 다양한 앙부일구 받침대 중에서도 가장 뛰어난 조형미를 보여주고 있다. 앙부일구에 새겨진 북극고도는 1713년 이후에 제작되었음을 알 수 있는데, 실제 제작은 19세기 진주 강씨 앙부일구 전문제작자의 활동 시기에 근접할 것으로 추정된다. 본 연구가 2022년 지정 보물 앙부일구의 재질과 외형적 특징을 분석함으로써 근대 과학기기의 과학기술사적 고찰을 견인할 수 있기를 기대한다.