Aristotle first theorized that the earth was round. Columbus died believing he proved Aristotle correct, but the real confirmation came in the expedition of Ferdinand Magellan, the captain of the first ship to sail completely around the world.
Magellan was a Portuguese sailor who explored Asia. While he was in Asia, Magellan picked up an Asian boy he called Enrique, who he brought back to Portugal. Magellan asked the King of Portugal to finance an expedition around the world. When the king rejected him, Magellan disowned his allegiance to Portugal and offered his services to Spain.
Magellan left Spain in 1519 with five ships. It took more than fourteen months to find the southern opening to the Pacific Ocean. He found it in the frigid, stormy waters now known as the Strait of Magellan. What Magellan did not count on was the immensity of the Pacific, a body of water larger than all of the land on earth. Magellan expected Asia to be a few hundred miles past beyond the coast of South America. Instead, the expedition traveled 12,600 miles before reaching land.