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- Eratosthenes's measure of the Earth's circumference
- Zeleny, Enrique
- Ensino Médio::Matemática
- Eratosthenes measured the circumference of Earth around 240 BC, based on the fact that the Sun appears in the zenith at noon on the summer solstice, in Syene (modern Aswan). At the same time, in Alexandria, the angle of the shadow of a post was slightly more than 7° (you can vary this parameter in this Demonstration), which is roughly 1/50 of the circumference (7/360 ≈ 0.0194444); the distance between the cities is 5000 stadia (an ancient Greek unit, about 185 meters) or about 925 km. The calculation gives 925/.02 ≈ 46250 km, a value very near today's value of 40000 km, with an error of 16%; an amazing feat for the epoch in which he lived
- Wolfram demonstrations project
- Educação Básica::Ensino Médio::Matemática::Geometria
- Ilustrar o cálculo da medida da circunferência da Terra, feita pela primeira vez por Eratóstenes, em 240 a.C.
- This demonstration needs the "MathematicaPlayer.exe" to run. Find it in http://objetoseducacionais2.mec.gov.br/handle/mec/4737
- Demosntration freeware using MathematicaPlayer
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