How did ancient Greeks such as Aristotle know that Earth is round?
A) From the ancient manuscripts of authors such as Homer.
B) By triangulation (measuring the distance between 2 points, and measuring 2 angles, to determine the distance to a 3rd point).
C) By noting that ships drop below the horizon as they go out to sea.
D) Careful measurements of the distance, along Earth's surface, between two widely separated points showed it to be longer than the straight- line distance.
E) Actually, the ancient Greeks thought that Earth is flat.

Question

Quizplus · Accepted Answer

Ancient Greeks, including Aristotle, observed that ships gradually disappear from view hull-first when sailing away, suggesting a curved surface.

How Did Ancient Greeks Such as Aristotle Know That Earth