EdmundHalleywasanEnglishscientistwholivedover200yearsag...
问题详情：EdmundHalleywasanEnglishscientistwholivedover200yearsago.Hestudiedthe1111]observationsofcomets(彗星)whichotherscientistshadmade.Theorbit（轨道）ofoneparticularcometwasaverydifficultmathematicalpro...