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On geography

Herodotus provides much information about the nature of the world and the status of science during his lifetime, often engaging in private speculation likewise. For example, he reports that the annual flooding of the Nile was said to be the result of melting snows far to the south, and he comments that he cannot understand how there can be snow in Africa, the hottest part of the known world, offering an elaborate explanation based on the way that desert winds affect the passage of the Sun over this part of the world (2:18ff). He also passes on reports from Phoenician sailors that, while circumnavigating Africa, they "saw the sun on the right side while sailing westwards", although, being unaware of the existence of the southern hemisphere, he says that he does not believe the claim. Owing to this brief mention, which is included almost as an afterthought, it has been argued that Africa was circumnavigated by ancient seafarers, for this is precisely where the sun ought to have been. His accounts of India are among the oldest records of Indian civilization by an outsider.