Mention115191

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so:text In comparison with the great size of the earth the protrusion of mountains is not sufficient to deprive it of its spherical shape or to invalidate measurements based on its spherical shape. For Eratosthenes shows that the perpendicular distance from the highest mountain tops to the lowest regions is ten stades . This he shows with the help of dioptras which measure magnitudes at a distance. (en)
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