By Dava Sobel
Anyone alive within the eighteenth century could have identified that "the longitude challenge" used to be the thorniest medical obstacle of the day―and were for hundreds of years. missing the facility to degree their longitude, sailors during the nice a long time of exploration were actually misplaced at sea once they overlooked land. millions of lives and the expanding fortunes of countries held on a solution. One guy, John Harrison, in entire competition to the medical neighborhood, dared to visualize a mechanical solution―a clock that may retain specified time at sea, anything no clock had ever been in a position to do on land. Longitude is the dramatic human tale of an epic medical quest and of Harrison's forty-year obsession with construction his excellent timekeeper, recognized this present day because the chronometer. jam-packed with heroism and chicanery, it's also a desirable short heritage of astronomy, navigation, and clockmaking, and opens a brand new window on our world.