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%
11
flagFinland
94%
2%
0%
2%
38
flagNew Zealand
90%
10%
0%
0%
10
flagItaly
89%
2%
4%
4%
49
flagGreece
85%
0%
7%
7%
14
flagCzech Republic
81%
0%
9%
9%
11
flagthe United Arab Emirates
80%
13%
0%
6%
15
flagIndia
77%
11%
11%
0%
18
flagGermany
76%
9%
9%
4%
122
flagthe United States
74%
9%
11%
5%
109
flagPoland
72%
10%
10%
6%
5121
flagNorway
69%
7%
15%
7%
13
flagthe United Kingdom
68%
12%
12%
5%
154
flagthe Netherlands
65%
5%
15%
15%
20
flagUnknown
62%
7%
18%
11%
27
flagFrance
59%
9%
22%
9%
22
flagRepublic of Ireland
46%
13%
20%
20%
15

Gender

men80%
women69%
in 3rd century B.C.
80%
69%
in 12th century
6%
11%
in 15th century
7%
11%
in 17th century
5%
6%

Details

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