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
flagAustralia
91%
8%
0%
0%
12
flagthe United Arab Emirates
89%
6%
0%
3%
29
flagItaly
86%
6%
3%
4%
66
flagCzech Republic
85%
0%
7%
7%
14
flagGreece
84%
0%
12%
4%
25
flagSpain
81%
9%
0%
9%
11
flagthe United Kingdom
76%
9%
10%
3%
285
flagthe United States
76%
8%
10%
4%
145
flagIndia
75%
12%
8%
0%
24
flagthe Netherlands
74%
6%
12%
8%
50
flagGermany
71%
12%
9%
6%
167
flagPoland
69%
11%
12%
6%
9148
flagNorway
69%
8%
8%
13%
23
flagUnknown
57%
13%
17%
10%
645
flagFrance
56%
8%
26%
8%
23
flagRepublic of Ireland
50%
13%
16%
20%
30
flagSweden
50%
10%
20%
20%
10
flagUkraine
30%
40%
30%
0%
10

Gender

men72%
women69%
in 3rd century B.C.
72%
69%
in 12th century
9%
12%
in 15th century
10%
12%
in 17th century
7%
6%

Details

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