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When is the earliest plausible circumnavigation of the earth? ... attempts by Greeks/Phonicians in the late BC's (after the greek philosophers argeed on a spherical earth ~500bc)? Or maybe Indian explorers after the Greaco-Indian Kingdoms transferred knowledge (or maybe after Aryabhata calculated the same things that the Greeks did)?

Anyone have a good guess on when it could have been done, and prehaps more interesting, what it could result in historically?
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