利用古代天象记载研究地球自转长期变化的原理和方法

PRINCIPLE AND METHOD TO STUDY SECULAR VARIATION OF THE EARTH'S ROTATION USING OBSERVATIONS OF ANCIENT ASTRONOMICAL EVENTS

概括介绍利用古代某些天象的观测记载 ,研究地球自转速率长期变化的意义、基本原理和方法 ,这是目前研究近 2 0多个世纪间地球自转长期变化的惟一有效的方法 ;

The principle, method and significance to study the secular variation of the Earths rotation rate using observations of ancient astronomical events is simply introduced. At present, the method is thought to be the only effective one for the study of the secular variation of the Earths rotation in the past 20 centuries and more. Present results and problems of the study are also introduced.