Library of Alexandria
... that Eratosthenes, the head librarian of the Library of Alexandria, calculated the circumference of the earth with remarkable accuracy in the third century BC?
... that <a href="./Eratosthenes" id="mwBIw" rel="mw:WikiLink" title="Eratosthenes">Eratosthenes</a>, the head librarian of the <b id="mwBI0"><a href="./Library_of_Alexandria" id="mwBI4" rel="mw:WikiLink" title="Library of Alexandria">Library of Alexandria</a></b>, calculated the circumference of the earth with remarkable accuracy in the third century BC?