Born Apameia, (Syria), 135 BCE
Died Rhodes, (Greece), 51 BCE
Posidonius is responsible for an early measurement of the circumference of the Earth.
Posidonius was from a Greek family though he was born in Syria. He was raised in the Greek tradition and completed his education in Athens under the great Stoic philosopher Panaetius of Rhodes. His name is sometimes listed as Posidonius of Apameia, while at other times it is listed as Posidonius of Rhodes. The former obviously refers to the place of his birth, while the latter refers to the place where he ultimately taught.
Presumably, the influence of Panaetius is what brought Posidonius to Rhodes. Sometime after 100 BCE he is known to have become the head of the Stoic school at Rhodes, where he taught both Ciceroand Pompey (the Great). In 86 BCE, Posidonius was sent as an envoy to Rome, where he met Gaius Marius, the Roman politician and general. It is also probable that it was around this time that he first met Pompey, who later...
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