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Greenwich, England, 1985 -Photograph by Bruce Dale
"One hop bridges east and west at Greenwich, England, where a brass strip marks zero longitude. First used by sailors to fix their position, Greenwich mean time was adopted by railroads and, after 1884, worldwide as the standard for time of day. Time is now set not by earth's rotation, but by satellite and atomic clock."

(Text and photograph from "The Enigma of Time," March 1990, National Geographic magazine)