Hess, Wagner, and Eratosthenes By rcden508 276 BCE Erastothenes Born Period: 276 BCE to 1 CE Erastothenes 236 BCE Chief Librarian in Alexandia 234 BCE Finds Circumference of earth 1904 Wagner graduates Astronomy Period: 1904 to 1930 Wegner 1906 World record time in a balloon 1912 Thinks continents are in motion 1915 Publishes The Origin of Continents and Oceans 1926 Mocked in international conference for continental drift theory 1930 Dies dogsledding 1940 Uses sonar to learn about ocean floor Period: 1940 to 1969 Hess 1962 Hess publishes History of the oceans Aug 25, 1969 Death of Wess