Watch this episode now on 4oD
Professor Allan Chapman explores the world of the ancient Greeks, as the first great seafaring people they needed astronomy for navigation as well as time-keeping. And the freedom that came from trade allowed them to question and reason.
As a result they became the greatest astronomers of the ancient world - the Greeks not only knew that the earth was round, they also knew its size, and even successfully calculated the distance of the moon from the earth.
Watch now on 4oD
