Phoenix32890 wrote: For Pete's sake, in 1492 most people thought that the earth was flat, until Columbus proved them wrong.
Actually, navigators knew that the Earth was round; they were just unable to determine how big it was. Columbus was wrong; he thought the Earth was much smaller than it actually is. Witness his naming of Native Americans as "Indians."
Others were wrong, too, they thought the Earth was much larger and that there was no way to carry enough provisions to reach Asia.