On the Line: The Story of the Greenwich Meridian

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The Royal Observatory at Greenwich is the home of time and space, the Prime Meridian and Greenwich Mean Time (GMT). But have you ever stopped to ask what is the Prime Meridian and why it is at Greenwich?  Why are all time zones across the world based on GMT? What is longitude and why is the meridian moving?

Written by Dr Louise Devoy, Senior Curator of the Royal Observatory at Royal Museums Greenwich.

  • Provides clear explanations about latitude and longitude and the world’s time zones
  • Offers a succinct history of the Meridian Line and its importance in defining international time standards
  • Breaks down complex topics into manageable articles, with fun trivia to aid understanding

This insightful, concise guide reveals why international time standards are based around the Greenwich meridian – Longitude 0º – where east meets west, and the important discoveries made at Greenwich that led to time as we know it.

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