About: http://webisa.webdatacommons.org/212851818

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Eratosthenes before 200BC not only was working with the idea that Earth was a sphere, but he also managed to measure its circumference to 10% accuracy using math and a stick.
http://www.w3.org/ns/prov#wasQuotedFrom	freethoughtblogs.com