Greenwich and the story of time

Introduction Lines around the world Measuring latitude and longitude Finding longitude at sea The first accurate chronometer The Prime Meridian at Greenwich Greenwich Mean Time (GMT) Greenwich Meridian Trail Send this story to a friend Printer-friendly version View this story in pictures

Introduction
Greenwich Meridian Line. © NMM Every year many thousands of people visit the Royal Observatory at Greenwich to stand over the line that marks the Prime Meridian of the World. Why does this line run through Greenwich? Why is it important today?