Comment Re:How does the quote go...? (Score 1) 267
The Earth's radius was pretty well known, yet still Columbus worked with a few very wrong assumptions. His expectations of the distance to China (on the "known" route to the East) were vastly overblown (mostly because a good deal of that distance estimate came from Marco Polos expedition there some three hundred years earlier), while at the same time his estimate of the size of the Earth were a bit too small. Search for Behaim Globe (Behaim was a German cartographer who made globes before America was discovered) to see what his expectations of Earth would have looked like.
From this point of view, his idea wasn't as idiotic as it may initially appear. Actually, he expected to hit China or at least Japan approximately where the US midwest would be.
Well, and actually if it hadn't have been that their size calculation was off and there was an entire continent in the way, they would have probably starved to death on the ships before making it to "the East" (or even to that "US midwest" distance they thought it was).