日本古代的一次可能的日全食与地球自转变化

A Possible Total Solar Eclipse in Ancient Japan and Variation of the Earth's Rotation

利用古代日食观测记载研究地球自转长期变化的方法和已有的结果为基础 ,研究了日本的古书中记载的可能与古代一次日全食有关的“天门”传说 ,及朝鲜的古书中与此有关的记载 .本文的结果支持一些学者认为这个传说是由发生于公元 15 8年 7月 13日的日全食引起的观点 ,并在历书时ET系统下计算分析了该日食的参数 ,由此得到表示地球自转变化的ΔT值约为 2 .2 2小时 .

It is studied that a legend recorded in two ancient books of Japan and an ancient book of Korea. The legend was considered to probably relate to an ancient total solar eclipse. In this paper, the study is based on the method that studies the secular variation of the Earth's rotation using observations of solar and lunar eclipses in ancient times and results at present. The result of this paper supports the idea that the legend may be related to the total solar eclipse occurred in A.D. 0158 07 13. The parameters of the eclipse is calculated and analyzed according to ET time system. A Δ T , 2.22 hours, which describes the secular variation of the Earth's rotation,is obtained.