and inventor, who realized the eolipila and other different mechanical devices. His chronologial collocation is uncertain and it could be traced back to the I and II century B.C..
Geography Eratosthenes of Cyrene (Cyrene, 276 B.C. – Alexandria, 194 B.C.): he was an ancient Greek mathematician, astronomer, geographer and poet. He was one of the most versatile intellectuals of his period. He was the third librarian of Alexandria’s Bibliotheque and he was also the tutor of Ptolemy IV Philopator, he is now known because he was the first who measured precisely the Earth dimensions.
Astronomy Aristarcus of Samo(Samo, about 310 B.C.– about 230 a.C.): he was a great ancient Greek astronomer. In the first half of the II century B. C. he developed the ancient heliocentric theory. As referred by Archimedes, Aristarcus suggested: “that fixed stars are unchangeables and that the Earth turns around the Sun, describing a circle”. 400
Astronomy Hipparcus Nicaea (Nicaea, 190 B.C. – Rhodes, 120 B.C.): he was an ancient greek astronomer, mathematician and geographer. He made the first valuation of the earth’s precession and he also realized the first map.
Medicine Herophilus of Chalcedon:(Chalcedon, about 335 B.C. – Alexandria, about 280 B.C.), he was a Greek-hellenistic doctor, he is known as the first anatomist of the history and he also was the first founder of the great medical school of Alexandria. He was the first who made conclusions about human body’s dissection.
Technology and Production Important in the hellenistic period was the development of technical applications. There were great