Earth Mysteries Part-1

One of the oldest earth mysteries was 'what shape is it?' Eratosthenes, in 240 BC, was able to prove the sphericity of the earth and estimate its size to a reasonable margin of error, by comparing the angle of the sun at two distant locations simultaneously. Aristotle knew that the earth was spherical, citing the horizon, the Earth's circular shadow during lunar eclipses, and other phenomena. Many educated people knew about the spherical earth from late antiquity on. However, most Europeans beli…