The armillary sphere, an astronomical observation device embodying the Orbital Heaven Theory of the Later Han Dynasty in China, holds both historical and scientific significance. It has been produced in various forms by many individuals since its inception in the era of King Sejong in the Joseon Dynasty. A prominent figure in this field was Nam Byeong-cheol (南秉哲, 1817-1863), known for his work 'Uigijipseol' (儀器輯說), published in 1859, which detailed the history, production methods, and usage of the armillary sphere. This text particularly highlights 21 applications of the armillary sphere, divided into 33 measurements, covering aspects like installation, time, and positional measurements, supplemented with explanations of spherical trigonometry. Despite numerous records of the armillary sphere's design during the Joseon Dynasty, detailed usage information remains scarce. In this study, the 33 measurements described in 'Uigijipseol' (儀器輯說) were systematically classified into six for installation, nineteen for position measurement, seven for time measurement, and one for other purposes. Additionally, the measurement methods were analyzed and organized by dividing them into the ecliptic ring, moving equatorial ring, and fixed equatorial ring of the armillary sphere. In other words, from a modern astronomical perspective, the results of schematization for each step were presented by analyzing it from the viewpoint of longitude, right ascension, and solar time. Through the analysis of Nam's armillary sphere, this study not only aims to validate the restoration model of the armillary sphere but also suggests the potential for its use in basic astronomical education based on the understanding of the 19th-century Joseon armillary sphere.

1. 서론
2. 남병철 혼천의의 구조
    2.1. 남병철과 의기집설
    2.2. 혼천의 구조
3. 남병철 혼천의의 용법
    3.1. 혼천의 설치 (선행 과정)
    3.2. 천체의 위치 측정
    3.3. 시간 측정법
    3.4. 기타 사항
4. 결론
ACKNOWLEDGMENTS
REFERENCES

• 김용기(충북대학교, 충북Pro메이커센터) | YONGGI KIM (Chungbuk National University, Cheongju 28644, Korea, Chungbuk Pro Maker Center, Cheongju 28644, Korea)
• 유경한(충북대학교) | GEOYOUNG-HAN YOO (Chungbuk National University, Cheongju 28644, Korea)
• 남경욱(국립과천과학관) | KYOUNG-UK NAM (Gwacheon National Science Museum, Gwacheon 13817, Korea)
• 민병희(충북대학교, 한국천문연구원, 과학기술연합대학원대학교) | BYEONG-HEE MIHN (Chungbuk National University, Cheongju 28644, Korea, Korea Astronomy and Space Science Institute, Daejeon 34055, Korea, University of Science and Technology, Daejeon 34113, Korea)
• 김상혁(한국천문연구원) | SANG HYUK KIM (Korea Astronomy and Space Science Institute, Daejeon 34055, Korea)
• 최홍순(충북대학교, 한국천문연구원) | HONG SOON CHOI (Chungbuk National University, Cheongju 28644, Korea, Korea Astronomy and Space Science Institute, Daejeon 34055, Korea) Corresponding author