The astronomer Aristarchus of Samos was the first known person to propose a heliocentric model of the solar system, while the geographer Eratosthenes accurately calculated the circumference of the Earth. Hipparchus (c. 190 – c. 120 BC) produced the first systematic star catalog. The level of achievement in Hellenistic astronomy and engineering is impressively shown by the Antikythera mechanism (150-100 BC), an analog computer for calculating the position of planets. Technological artifacts of similar complexity did not reappear until the 14th century, when mechanical astronomical clocks appeared in Europe. COUNT 5
QSN1 Who created the sun-centered model of the solar system? ANS1 Aristarchus of Samos QSN2 Who was able to determine the circumference of the Earth? ANS2 Eratosthenes QSN3 Who made the first catalog of stars? ANS3 Hipparchus QSN4 When was the Antikythera mechanism used? ANS4 150-100 BC QSN5 What was used to determine the position of planets within the solar system? ANS5 the Antikythera mechanism