由日本古代中心日食记载得到的地球自转速率变化

VARIATION OF M EARTH'S ROTATION DERIVED FROM JAPANESE RECORDS OF ANCIENT CENTRAL SOLAR ECLIPSES

简要介绍了古代中心日食的观测记载在地球自转变化研究中的意义．给出了由日本的6例古代中心日食记载得到的表示地球自转变化的△T值，相应的日长变化的均值约为1．6ms／cy（cy为世纪，下同）

In thes paper, it is simply intfodued that the sighficance of observahonal amrds of andent central solar eclipses for the study of variahon of the Eand s rotahon' The author gives values of T Which expresses the long-term variahon of the rotahon, dfored from Japanese andent amrds of 6 del eelipses. The variahon of length of the day aanrdng to the edt is about 1.6 ms /cy.