0:00:00.000,0:00:04.000
The angles he measured by degrees, of course.
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[Enrico Giusti, Curator, Garden of Archimedes ] For the unit of length, he used the stadium,
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but he didn't measure with a rope or something,
0:00:11.000,0:00:17.000
but he estimated the distance between Syene and Alexandria
0:00:17.000,0:00:22.000
by the time that a camel would need to go from one city to another.
0:00:22.000,0:00:28.000
Eratosthenes measure was rather accurate for the time.
0:00:28.000,0:00:33.000
Even for modern standards, it was say about 10%.
0:00:33.000,0:00:37.000
The source of error was essentially the estimation of the distance,
0:00:37.000,9:59:59.000
because the angles he could measure with a good accuracy.