Archive for History of Exact Sciences

, Volume 69, Issue 1, pp 103–123 | Cite as

Eclipse theory in the Jing chu li: Part I. The adoption of lunar velocity

Article

Abstract

This paper investigates the methods of eclipse prediction in China before the fourth century AD, with a detailed example of the eclipse theory in the Jing chu li (Luminous Inception System
). As the official calendar of the Jin dynasty and the Kingdom Wei during the three kingdoms period, the Jing chu li was used for more than 200 years after it was adopted in 237 AD. From the San tong li (Triple Concordance System
) of the Western Han to the Jing chu li, methods for predicting eclipses developed in three important ways: (i) from predicting only lunar eclipses to the prediction of both solar and lunar eclipses; (ii) from relying only on the mean periods of the sun and the moon to taking into consideration the variation in lunar velocity; and (iii) from estimating only a rough date to predicting the exact time of eclipses. This paper addresses two questions: first, how did ancient Chinese astronomers use cycles to predict eclipses in the Han dynasty? Second, how did astronomers such as Liu Hong
and Yang Wei
revise early eclipse prediction methods? The original text of the Jing chu li is analyzed to show how Yang Wei combined lunar velocity theory with the traditional method of predicting eclipses using cycles.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Department of Egyptology and AssyriologyBrown UniversityProvidenceUSA

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