4 · en
Short, simple sentences with “circumference”, suitable for children and primary/elementary school, with common expressions and related words. You'll also find examples for middle and high school.
They quickly calculated the length of the circumference.
Therefore, Columbus would have no way of knowing when he had travelled far enough around the Earth to reach his goal, and in fact, Columbus grossly underestimated the circumference of the Earth.
Although the calculations of the earth's circumference made by the Greek geographer Eratosthenes in the second century BC were known (and, as we now know, almost accurate), most scholars did not believe them to be reliable.
The voyage was thought to be feasible both because all educated people already accepted that the world was round (common knowledge since the days of ancient Greece) and because the circumference of the globe was not really clear to them: it was simply not known how long it would take to sail west to reach the Far East.
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