送交者: 008 于 2005-1-12, 21:50:48:
回答: 埃拉托色尼妙而准确地测定了地球周长 由 HunHunSheng 于 2005-1-12, 16:39:33:
they must have known that the earth is a ball instead of a plate. How the hell did they find that out? As far as measurement goes, if their estimation falls into the same order of magnitude, it is a big success.