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.




This week's guest post comes from Tom Gurling, part of our Visitor Experience team.


The log-reel, line, log-ship and sand-glass were used for determining a ship’s speed.

How did ships know where they were before seamen could get an accurate reading of their east/west location?