How Did Eratosthenes Estimate the Size of Earth

question 33

Multiple Choice

How did Eratosthenes estimate the size of Earth?

• A) They used the height of sailing ships as they sailed over the horizon to estimate curvature of Earth, which allowed estimation of its size.
• B) They didn't; everyone thought the world was flat until Columbus' time.
• C) They measured the angle of the Sun above the horizon at midday in two places with different latitude and used the angle to estimate the circumference of Earth.
• D) They measured the altitude of mountains in Greece, then used the distance they were lost from sight to estimate the curvature of Earth, which allowed estimation of the its size.

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