      National Geographic Photo of the Day and Wallpaper: Zero Lon

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Photo of the Day   January 5, 2007    PREVIOUS [4]   |  NEXT [5]
 [6]
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&#039s rotation,
but by satellite and atomic clock."

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