How was the size of Earth first measured?

submitted by boston_blackie from (stardate.org)

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[–]TaseAFeminist4Jesus 1 insightful - 1 fun1 insightful - 0 fun2 insightful - 1 fun -  (0 children)

I believe it was first approximated by measuring the curvature of the Earth. This was done by considering how far one can see on flat ground (or over water) in the complete absence of any obstruction.

ETA I was wrong. It was first done by Eratosthenes using shadows. Weird.