Tag: summer solstice;

How Eratosthenes found the circumference of the Earth

Eratosthenes of Cyrene (b. c. 276 BC, Cyrene, Libya–d. c. 194, Alexandria, Egypt), Greek scientific writer, astronomer, and poet, the first man known to have calculated the Earth’s circumference amazon appstore herunterladen. At Syene (now Aswan), some 800 km (500 Read More