When was the circumference of the Earth calculated for the first time with remarkable accuracy (13.6% of error)?

in 3rd century B.C.
in 12th century
in 15th century
in 17th century
Er­atos­thenes of Cyrene was the chief li­brar­i­an at the Library of Alexan­dri­a. He is best known for being the first person to cal­cu­late the cir­cum­fer­ence of the Earth. He did it by mea­sur­ing Sun's angle of el­e­va­tion at noon on the solstice in Alexan­dri­a, knowing, that at the same time the Sun is at Zenith in the Ancient Egyptian city of Swenet, 5000 stades from Alexan­dri­a. Sev­en­teen hundred years after Christo­pher Columbus studied Er­atos­thenes writings and decided that the cal­cu­la­tions were wrong, and the Earth must be smaller - which led him to seek India in the west.

Answers distribution

in 3rd century B.C.
in 12th century
in 15th century
in 17th century
answers
flagItaly
92%
0%
2%
4%
41
flagFinland
92%
3%
0%
3%
28
flagNew Zealand
90%
10%
0%
0%
10
flagGermany
73%
13%
7%
5%
90
flagthe United States
71%
10%
13%
5%
76
flagIndia
71%
14%
14%
0%
14
flagPoland
71%
10%
11%
6%
4150
flagNorway
69%
7%
15%
7%
13
flagthe United Kingdom
67%
13%
13%
6%
98
flagFrance
55%
10%
25%
10%
20

Gender

men79%
women67%
in 3rd century B.C.
79%
68%
in 12th century
6%
11%
in 15th century
7%
13%
in 17th century
6%
6%

Details

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