Korea Astronomy and Space Science Institute (KASI) has constructed online database of the Korean Astronomical Almanac as a part of the 'Knowledge and Information Business Project 2009' supported by the Ministry of Knowledge Economy. Throughout this project, KASI provides both digitized images and extracted text from the almanac covering approximately 240 years. The primary purpose of this paper is to serve as a reference for users of the almanac database. Hence, we introduce the calendar history and kinds of the astronomical almanac used in Korea, and explain the contents of the almanacs according to its appearance time. We also briefly mention the steps employed in constructing the database system and Web site. Since ancient times, astronomical almanacs have been an essential part of daily life. We, therefore, believe that the astronomical almanac database constructed by KASI will prove its usefulness in various fields, and particularly in the study of historical astronomy.

ABSTRACT
1. 서론
2. 한국의 역법과 역서
    2.1. 역법 연혁
    2.2. 역서의 변천
3. 역서 데이터베이스 구축
    3.1. 원천 자료 처리
    3.2. 역서 자료의 웹구현
    3.3. 역서 데이터베이스 목록
4. 시대별 역서의 내용
    4.1. 시헌력/시헌서
    4.2. 내용삼력/내용삼서
    4.3. 대통력
    4.4. 명시력
    4.5. 력
    4.6. 조선민력
    4.7. 약력
5. 요약
참고 문헌

• 이기원(한국천문연구원) | KI-WON LEE (Korea Astronomy and Space Science Institute)
• 안영숙(한국천문연구원) | YOUNG-SOOK AHN (Korea Astronomy and Space Science Institute)
• 민병희(한국천문연구원) | BYEONG-HEE MIHN (Korea Astronomy and Space Science Institute)
• 신재식(한국천문연구원) | JAE-SIK SHIN (Korea Astronomy and Space Science Institute)