Posidonius was a Greek politician, astronomer, astrologer, geographer, historian, mathematician, and teacher native to Apamea, Syria. He was considered the most learned man of his time and, possibly, of the entire Stoic school. 135 BC – 51 BC; died at about 84. Alive at the same time as Julius Caesar, Virgil, Hipparchus, Augustus, and Cicero. Wiki link