“三苗日食”的可能年代

Chronology of Eclipse"San Miao

史载上古禹时日妖宵出被解释为日落时发生的日食。分析了相关史料。

The ancient book'Mozi'(5th century BC)records:'In ancient times,the San Miao tribes were in disarray. The sun roes in the evening...King Yu vanquished them.'King Yu is a prehistoric person living in 23 19th century BC The strange phenomena'sun rose in evening'was explained as a large solar eclipse at sunset by Pang . Therefore investigations on it may lead to an important progress of Chinese chronology. After an analysis on all similar records in Chinese history,we pay main attention to the relationship of eclipse computations with parameter'c',the long term of earth's rotation rate. We have computed all the solar eclipses in that period by the way similar to that used for investigating the'double dawn'eclipse . By change parameter'c'in reasonable range(28～36 sec/cy 2),we have found 11 possible results listed in Tab.1.Fig.1 shows the eclipse maps and relative'double dawn/dusk'areas while Fig. 2 illustrates how the parameter 'c' affect the results. For an exact conclusion of King Yu's chronology,we need further progress from both side: history which may limit the King Yu's period and astronomy which may limit the possible range of parameter 'c'.