Dr. Bergmann's Talk
Dr. Bergmann's Talk
Dr. Bergmann's Talk
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Eratosthenes<br />
(276 - 194 BC)<br />
on the summer solstice at local noon on the Tropic of Cancer, the<br />
Sun would appear at directly overhead in the town of Aswan<br />
in his hometown of Alexandria, north of Aswan, the angle of elevation<br />
of the Sun would be 7.2° south of the zenith at the same time.<br />
the distance between the cities was known from caravan<br />
travellings to be about 5,000 stadia (1 stadium ~ 180 m)<br />
Eratosthenes' value corresponds to ~ 39,690 km<br />
(exact value: 40,008 km) N<br />
equator<br />
S<br />
7.2 o
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