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
flagFinland
94%
2%
0%
2%
35
flagItaly
92%
0%
2%
4%
41
flagNew Zealand
90%
10%
0%
0%
10
flagIndia
73%
13%
13%
0%
15
flagGermany
72%
12%
8%
6%
96
flagthe United States
72%
10%
11%
4%
85
flagPoland
71%
11%
11%
6%
4374
flagNorway
69%
7%
15%
7%
13
flagthe United Kingdom
64%
12%
14%
7%
108
flagFrance
57%
9%
23%
9%
21
flagUU
53%
15%
15%
15%
13
flagthe Netherlands
45%
9%
18%
27%
11

Gender

men79%
women68%
in 3rd century B.C.
79%
69%
in 12th century
6%
11%
in 15th century
7%
12%
in 17th century
5%
6%

Details

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