Quest for longitude
Latitude is measured by your position north or south of the equator but what about longitude? How is your east or west position defined? Discover all about the quest to establish longitude and why it was important, the men behind its discovery, and the establishment of the Prime Meridian at Greenwich.
Edmond Halley by Sir Godfrey Kneller (detail).jpg
Edmond Halley set out to sea to use magnetism as a possible solution to the problem of determining longitude.