Did Columbus Know the Earth Was Round? The Real Mistake Behind the 1492 Voyage

Yes. Christopher Columbus, like other educated Europeans of his time, knew that the Earth was round; the popular story that he sailed west to prove it was not flat is a much later myth. The real argument was about size. Columbus underestimated the Earth's size and the distance from Europe to Asia, which is why experts doubted his plan. He was wrong about the numbers, and the only reason he survived the mistake was that two continents nobody in Europe knew about lay in the way.

A sailor from Genoa

Columbus was born in 1451, sometime between late August and the end of October, in the Republic of Genoa in what is now Italy. Genoa was a city of merchants and sailors, and Columbus went to sea young, working on trading voyages around the Mediterranean and the Atlantic coasts of Europe and Africa.

In the fifteenth century, Europe's most valuable trade goods, spices, silk and other luxuries, came from Asia over long and expensive routes controlled by others. Portugal was trying to reach Asia by sailing around Africa. Columbus proposed a shortcut: sail west across the Atlantic to reach the East Indies directly.

Why the experts said no

Columbus first took his plan to Portugal, which rejected it. The rejection was not because anyone thought he would sail off the edge of the world. Scholars since ancient Greece had known the Earth was a sphere, and medieval educated Europeans took that for granted.

The experts' objection was mathematical. They had a fairly good estimate of how big the Earth was, and they calculated that Asia was far too far away for any ship of the time to reach by sailing west without running out of food and water. Columbus used smaller figures for the planet and bigger figures for Asia, and his sums made the trip look possible. On the central question, the experts were right and Columbus was wrong.

Spain says yes

After years of lobbying, Columbus finally won the support of the Catholic Monarchs of Spain, Queen Isabella I of Castile and King Ferdinand II of Aragon, who agreed to sponsor him in 1492. It was a remarkable year for Spain: the monarchs had just completed the conquest of Granada, the last Muslim kingdom on the Iberian peninsula.

Columbus left the port of Palos in August 1492 with three ships, the Niña, the Pinta and the Santa María.

12 October 1492

After more than two months at sea, the expedition reached an island in the Bahamas that its inhabitants called Guanahani, on 12 October 1492. Columbus believed he had arrived in the islands off Asia. That is why he called the local people "Indians", a name that stuck for centuries.

He went on to explore Cuba and Hispaniola, the island now shared by Haiti and the Dominican Republic, before returning to Spain, where he was received with great honour.

Four voyages and a stubborn belief

Columbus made four voyages across the Atlantic for Spain between 1492 and 1504. His expeditions were the first known European contact with the Caribbean and with Central and South America.

Strikingly, he never clearly accepted that he had found lands unknown to Europeans. He believed he had reached Asia and never clearly renounced that belief. It was other navigators and mapmakers who realised that these were new continents; the name "America" comes from one of them, Amerigo Vespucci, not from Columbus.

Governor, prisoner

Spain made Columbus governor of the new colony on Hispaniola. His rule was a disaster. He was accused of brutality, both towards the Indigenous Taíno people and towards Spanish colonists, and in 1500 he was arrested, removed from his post and sent back from Hispaniola. He was later released, but he never regained his governorship.

He died in Valladolid, Spain, on 20 May 1506.

A changing legacy

For centuries Columbus was celebrated as a heroic discoverer. His voyages did change world history: they began the "Columbian exchange" of plants, animals, people and diseases between the hemispheres, and the European colonisation of the Americas.

Today historians place much more weight on the cost of that history for the peoples who already lived in the Americas, including violence, enslavement and devastating epidemics. As a result, Columbus is far less celebrated in Western culture than he once was, and public holidays and statues in his name have become the subject of debate.

He was a bold navigator, a poor mathematician by the standards of his own day, and a harsh governor. All three are part of the real story.

Learn with Columbus: English phrases

Phrase	Meaning	Example
to set sail	to begin a journey by boat, or begin a project	We set sail on our new course in January.
uncharted waters	a new, unknown situation	Starting a business put us in uncharted waters.
to underestimate	to think something is smaller or easier than it is	I underestimated how long the essay would take.
a myth	a widely believed story that isn't true	It's a myth that you can't learn a language as an adult.
to stumble upon	to find something by accident	I stumbled upon a great podcast for learners.

Try this: Write three English sentences about a time you underestimated something, a trip, a test or a task. Use "underestimate", "uncharted waters" and "stumble upon" once each.