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
flagVietnam
100%
0%
0%
0%
12
flagFinland
96%
1%
0%
1%
51
flagNew Zealand
90%
10%
0%
0%
10
flagAustralia
90%
10%
0%
0%
10
flagItaly
87%
4%
3%
4%
64
flagthe United Arab Emirates
87%
8%
0%
4%
24
flagGreece
85%
0%
7%
7%
14
flagCzech Republic
85%
0%
7%
7%
14
flagIndia
78%
13%
8%
0%
23
flagthe United Kingdom
77%
8%
10%
3%
250
flagthe United States
76%
7%
10%
5%
138
flagthe Netherlands
76%
5%
10%
7%
39
flagNorway
73%
5%
10%
10%
19
flagGermany
72%
11%
9%
6%
148
flagPoland
70%
11%
11%
6%
7224
flagFrance
59%
9%
22%
9%
22
flagUnknown
53%
13%
21%
11%
360
flagRepublic of Ireland
53%
15%
15%
15%
26

Gender

men73%
women68%
in 3rd century B.C.
73%
69%
in 12th century
8%
12%
in 15th century
10%
12%
in 17th century
7%
6%

Details

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