Song, I-Yeong (1619 ~ ?) was an active astronomer in the Joseon dynasty at the era of adopting the Shixian-li, Chinese calendar in Qing dynasty. His astronomical contribution was recorded in Annals of the Joseon Dynasty, Diary of the Royal Secretariat, Comparative Review of Records and Documents-Its Revision and Enlargement, and Treatise on the Bureau of Astronomy. In addition the details on his life and works were found at the genealogies of the Song Family from Yeonan and the Kim Family from Seonsan. His major astronomical activities can be summarized in three items. First, as a specialist astronomer, he has attempted to make a systematic observation of two comets. Second, he designed and fabricated the Jamyeong-jong, the weight-powered armillary clock, which became a typical model of the astronomical clock in the Joseon dynasty. Last, he served as a royal astronomical professor, greatly contributing on implementing the Shixian-li. Song has concentrated on performing astronomical duties for his royal official service time. Song is regarded as an important astronomer who made it possible to enforce the Shixian-li until the late Joseon dynasty.

ABSTRACT
1. 서론
2. 생애
    2.1. 생몰년
    2.2. 관직
3. 성변 관측
    3.1. 조선의 상시관측체계
    3.2. 특별관측과 측후단자
    3.3. 1661년 혜성관측
    3.4. 1668년 혜성관측
4. 서양 천문학의 수용
    4.1. 자명종(혼천시계) 제작
    4.2. 시헌력 시행과 대응
5. 토의
    5.1. 혼천시계 제작기술
    5.2. 몰년
6. 결론
REFERENCES

• 김상혁(한국천문연구원/과학기술연합대학원대학교) | SANG HYUK KIM (Korea Astronomy and Space Science Institute/Korea University of Science and Technology)
• 민병희(한국천문연구원/과학기술연합대학원대학교) | BYEONG-HEE MIHN (Korea Astronomy and Space Science Institute/Korea University of Science and Technology)
• 서윤경(한국천문연구원) | YOON-KYUNG SEO (Korea Astronomy and Space Science Institute)
• 이용삼(충북대학교) | YONG SAM LEE (Chungbuk National University)