By knowing the shape of our earth we can create maps, survive the oceans, follow rivers, navigate the skies, and travel across the globe. This is the story of our world, of how we discovered what no one thought possible - the shape of the earth. This fascinating and dramatic story weaves scientific rigour, egos, funding crises and betrayal with sea voyages, jungles and volcanoes. There was "Longitude", now comes "Latitude".