Radio de la tierra eratosthenes biography images

Eratosthenes was a mathematician, astronomer and geographer, born in B. The method he used to obtain it is not known. If we take as valid the meters that each stade was supposed to measure:. User Log in Privacy.

Eratosthenes experiment 1, × ; KB Eratosthenes × ; 7 KB Καμπυλότητα του εδάφους.png × ; 33 KBMissing: biography.

Catalogs Stats Stats Sports Statistics. No notifications. Stats Stats Sports Statistics. Eratosthenes of Cyrene. Calculation of the radius of the Earth. The radius of the Earth Eratosthenes was a mathematician, astronomer and geographer, born in B. As director of the Library of Alexandria Egypt he was aware of observations indicating that in Syene, now Aswan, at noon on the summer solstice when the Sun reaches its highest position in the sky it was observed that objects cast no shadow and the light entered the wells to the very depths.

This meant that the sun's rays fell perpendicular to the earth in that area.

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In Alexandria, on that same day, the objects did cast shadows. That is, those same sunbeams did not fall perpendicularly, but at a certain angle. It should be noted that Eratosthenes already held that the earth was curved, so this difference in the angle of incidence of the sun's rays reinforced his belief. He also believed that the sun was far enough away to consider that its rays would reach the earth practically parallel to each other.

Moreover, if the sun entered the well all the way to the bottom, he could infer that, if they were prolonged, they would reach the center of the earth.