1475-1484
Reflecting on these things, studying Perestrello's and Correo's charts and accounts of their voyages, corresponding with Toscanelli and other savans, himself an adept in drawing maps and sea-charts, for a time his occupation in Lisbon, cruising here and there, once far northward to Iceland, and talking with navigators from every Atlantic port, Columbus became acquainted with the best geographical science of his time. This had convinced him that India could be reached by sailing westward. The theoretical possibility of so doing was of course admitted by all who held the earth to be a sphere, but most regarded it practically impossible, in the then condition of navigation, to sail the necessary distance. Columbus considered the earth far smaller than was usually thought, a belief which we find hinted at so early as 1447, upon the famous mappe-Monde of the Pitti Palace in Florence, whereon Europe appears projected far round to the northwest. Columbus seems to have viewed this e...