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%
13
flagFinland
96%
1%
0%
1%
51
flagSwitzerland
95%
2%
2%
0%
46
flagthe United Arab Emirates
92%
5%
0%
2%
39
flagAustralia
92%
7%
0%
0%
13
flagGreece
86%
0%
10%
3%
30
flagCzech Republic
85%
0%
7%
7%
14
flagItaly
83%
6%
5%
4%
74
flagthe Netherlands
81%
5%
6%
5%
88
flagthe United Kingdom
77%
10%
8%
3%
326
flagthe United States
73%
10%
10%
4%
182
flagAustria
73%
8%
8%
8%
23
flagGermany
72%
12%
8%
5%
202
flagSweden
71%
10%
10%
7%
38
flagPoland
70%
11%
11%
6%
10544
flagIndia
70%
16%
9%
0%
31
flagNorway
70%
8%
8%
12%
24
flagUnknown
58%
13%
17%
9%
711
flagFrance
56%
8%
26%
8%
23
flagRepublic of Ireland
53%
10%
15%
20%
39

Gender

men73%
women71%
in 3rd century B.C.
73%
71%
in 12th century
9%
11%
in 15th century
10%
11%
in 17th century
6%
5%

Details

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