天再旦日食的根据与计算——对Keenan质疑的注释

Notes on Double Dawn-Reply to Keenan's Query

作者由“天再旦”日食说证实西周懿王元年为公元前 899年。夏商周断代工程以此为支点之一 ,得到西周年代表。针对读者的质疑 ,在历史文献的可靠性、天光视亮度的表达和计算方法、地球自转长期参数等方面做了进一步的阐述。

The author verified that the first year of King Yi of the West Zhou was 899 BC based on the eclipse hypothesis of Double Dawn.Xia-Shang-Zhou chronology project adopted this conclusion as one of the 7 key points of West Zhou chronology.D.J.Keenan fully call this work in question.Facing the arguments,the notes discussed the reliability of the original literature,the method to express and compute the visual sky brightness,the secular parameter of the Earth's rotation,and other problems.The auther consideres that Keenan's query is groundless.