LIU Ci-yuan

(National Time Service Center, Chinese Academy of Sciences, Xi′an 710600, China)

Abstract:All astronomical records in the dynastic Histories were checked and recomputed by modern astronomical method, and twenty-seven cases of discrepancies in calendar elements, the new-moon days and the intercalary months, were found compared with the famous Chinese historical calendar by Chen Yuan. It is important to collect such cases for reconstructing a true calendar, which was practically used in the Chinese history.

Key words: historical astronomical records; the 24 Histories; calendric system; Chinese calendar; new- moon day and intercalary months; Chen Yuan