We investigate the records related to the reign style and the calendar day from the epigraphs of the Goryeo dynasty (918 - 1392) in Korea in order to verify and supplement the sexagenary cycle data of the first day in the lunar month of the dynasty. The database of the National Research Institute of Culture Heritage contains a rubbed-copy image, transcription statement, and translation statement for Korean epigraphs as well as 775 epigraphs corresponding to the Goryeo dynasty. The epigraph records are valuable in that, during this time, they were written differently from other historical literature such as the Goryeosa (History of the Goryeo Dynasty), which was compiled in the next dynasty. We find that the Goryeo dynasty, in general, had adopted the reign styles of Chinese dynasties at that time. We also find 159 calendar day records all showing good agreement with the work of Ahn et al. except for dozens of records. Through this study, we can verify the reign styles and the calendar days of the Goryeo dynasty.

ABSTRACT
1. 서론
2. 연호 관련 기록
3. 역일 관련 기록
    3.1. 윤달 관련 기록
    3.2. 달의 대 소 관련 기록
    3.3. 날짜와 일진 관련 기록
4. 요약 및 결론
REFERENCES

• 이기원(대구가톨릭대학교) | KI-WON LEE (Catholic University of Daegu)
• 안영숙(한국천문연구원) | YOUNG SOOK AHN (Korea Astronomy and Space Science Institute)
• 민병희(한국천문연구원/충북대학교) | BYEONG-HEE MIHN (Korea Astronomy and Space Science Institute/Chungbuk National University)