The Longitude Problem

In an age before satellite navigation and GPS, one man found an ingenious solution to the problem of determining a ship's location at sea. Discover the relationship between place and time. Human Geography - Orientation And Settlements - Learning Points. Lines of latitude circle the Earth horizontally; lines of longitude run vertically from pole to pole. Calculating your latitude and longitude gives you your position in the world. Sailors use latitude and longitude to calculate their position at sea. John Harrison built an accurate portable clock, called a chronometer, to allow accurate naval navigation. A Twig Context Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts in action in the real world.