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Greenwich meridian
Introduction References & Edit History
Images & Videos
World map with continents and oceans labeled, featuring a bold vertical orange line marking the Greenwich Meridian, which runs from the North Pole through Europe and Africa to the South Pole. The line is labeled Greenwich Meridian and highlights the Prime Meridian at 0 degrees longitude. World map showing standard time zones, with each zone shaded and labeled by its offset from Greenwich Mean Time. The International Date Line is marked with a bold, zigzagging line in the Pacific Ocean, and variations for half-hour and other non-standard offsets are indicated. Continents, major countries, and oceans are labeled for reference.
Latitude, longitude, and the prime meridian explained
Investigate the global importance of the Royal Greenwich Observatory and how its location was chosen

Greenwich meridian: References & Edit History

Article Contributors

Primary Contributors

  • Sanat Pai Raikar
  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Invalidated site: Johns Hopkins University Applied Physics Laboratory - The Centenary of the Prime Meridian and of International Standard Time. Sep 28, 2026
Add new Web site: Historic UK - The Greenwich Meridian at The Royal Observatory, London. Sep 20, 2025
Add new Web site: Royal Museums Greenwich - What is the Prime Meridian, and why is it in Greenwich? May 28, 2025
Add new Web site: Academia - Zero degrees: geographies of the prime meridian (PDF). May 17, 2024
Add new Web site: Exploring Our Fluid Earth - Weird Science: The Prime Meridian and Time Zones. Feb 03, 2024
Add new Web site: Johns Hopkins University Applied Physics Laboratory - The Centenary of the Prime Meridian and of International Standard Time. Dec 15, 2023
Map added. Jun 13, 2023
Add new Web site: Royal Museums Greenwich - What is the Prime Meridian and why is it in Greenwich? Jun 02, 2023
Add new Web site: Live Science - Why the 'Prime Meridian of the World' Shifted Hundreds of Feet. Dec 16, 2022
Article thoroughly revised. Apr 22, 2022
Add new Web site: KidsGeo.com - Geography For Kids - The Four Seasons. Sep 13, 2016
Add new Web site: National Geographic - Education - Prime Meridian. Sep 04, 2016
Article added to new online database. Jul 20, 1998
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