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

机译：《精楚里》中的月食理论：第一部分。月球速度的采用

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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.
机译：本文研究了公元四世纪之前中国的日食预测方法，并以“景初里”中的日食理论为例进行了详细说明。作为三个王国时期金朝和魏国的官方历法，《景出礼》在公元237年被采用后已使用了200多年。从西汉的三统里（三合一系统）到京初里，黄食的预测方法以三种重要方式发展：（i）从仅预测月食到预测日食和月食; （ii）从仅依靠太阳和月亮的平均周期到考虑月球速度的变化; （iii）从仅估计粗略日期到预测日蚀的确切时间。本文讨论了两个问题：首先，古代中国天文学家如何利用周期来预测汉代的日食？其次，刘宏和杨伟等天文学家如何修改早期的日食预测方法？分析了《经初里》的原文，以显示杨伟如何将月球速度理论与传统的利用周期预测日食的方法相结合。

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