The Greek mathematician and astronomer Eratosthenes (275-195 B.C.) utilized a comparison among shadows to measure the Earth's circumference. Eratosthenes understands that over the working day of the sum mer solstice at midday the sun will be mirrored at the bottom of a particular very well in Siene (today's Assuan in https://scientologylogo00862.ezblogz.com/34699963/rumored-buzz-on-etwas-grobartiges