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Institution

Greenwich Observatory

A historic observatory with a prominent clock and dome stands under a dark sky, showcasing its architectural details and red brick facade.

The Royal Observatory at Greenwich, founded by Charles II in 1675 on a hill east of London. Its transit telescope defined the prime meridian adopted by the 1884 International Meridian Conference in Washington, making Greenwich Mean Time the reference clock for global navigation, telegraphy, and eventually the railroad zones of North America.

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