Due to the problem of determining geographical coordinates, long-distance voyages remained an extremely risky undertaking for centuries. The best minds of the whole world struggled with this problem. Finally, in 1714, the British Parliament promised the scientist who could solve the problem of determining longitude a fantastic reward of 20,000 pounds at that time. Oddly enough, the right solution was found by self-taught watchmaker John Harrison - a man who spent forty years of his life on this...How did he do it?..