The Greeks Spotlight on Ancient Greeks The Mycenaeans and Homer Greek Settlements The Land of Greece The City-State, Athens Democracy The City at War Naval Warfare Religion and the Gods Temples The Olympic Games The Family Home Greek Women Education Symposium Theaters and Actors Craftsmen Illness and Death Learning and Inventions	Early Theories of Astronomy The Greeks believed that the earth was the centre of the universe. They were endlessly curious about the stars and put forward many theories about how they moved through the sky. These theories were believed for 1,500 years before later scientists disproved them.   Previous: Back Book: The Greeks Section: Spotlight on Ancient Greeks Chapter: Learning and Inventions