Longitude is a short tale of an individual from an indistinct background and minimal education, striving to solve one of the most difficult conundrums of his day, through patience, diligence and a monumental attention to detail, combined with the exertions of half a century of labour. The story has plot twists and setbacks, rivals and allies, and if one wishes to stretch the imagination a little, even a villain. And of course, it’s all true.