Maritime history's greatest scientific breakthrough was working out longitude, the distance (measured in degrees, minutes, and seconds) of how far a point is, either East or West, of the Prime (Greenwich) Meridian. Dr Karl unravels this discovery with Kevin Sumption and James Hunter from the Australian National Maritime Museum in Sydney, as they talk about the history of navigation and their 2016 exhibition, Ships, Clocks and Stars: The Quest for Longitude. Hear about extraordinary nautical instruments, different methodologies for calculating longitude, and the impact of these inventions and explorations on the world today.