How did Columbus's landfall in the Caribbean help revolutionize European's understanding of world geography?

Columbus thought he had sailed around the world and found India. He thought the world was much smaller than it is.

· Writes at great length about his worldview and how he thinks the southern hemisphere is constructed.

· Backs up his theory with observations made along his voyages.

. The water to the south seems to rise, whereas the waters to the north seem to slope down, and thus claims that the world is not spherical as Ptolemy states but pear-shaped