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'''Greenwich Mean Time''', or GMT is the mean time that the [[earth]] takes to rotate from noon-to-noon. <ref>http://wwp.greenwichmeantime.com/what-is-gmt.htm</ref> The [[Greenwich Meridian]] ([[Prime Meridian]] or Longitude Zero degrees) marks the starting point of every time zone in the World. Physically, it is marked by a brass bar and accompanying symbol in the forecourt of the Museum which replaced the original Royal Observatory at [[Greenwich]] in south-east [[London]].  

'''Greenwich Mean Time''', or GMT, is the global time standard that is the mean solar time anywhere along the Greenwich Meridian. Because noon (the time when the sun is the highest overhead) does not occur at exactly the same point in every twenty-four day during the course of the year, we use the average ("mean") of each apparent noon as a standard that is called mean solar time.  

<ref>http://wwp.greenwichmeantime.com/what-is-gmt.htm</ref> The [[Greenwich Meridian]] ([[Prime Meridian]] or Longitude Zero degrees) marks the starting point of every time zone in the World. Physically, it is marked by a brass bar and accompanying symbol in the forecourt of the Museum which replaced the original Royal Observatory at [[Greenwich]] in south-east [[London]].  

[[Image: Greenwich_Meridian_Line.jpg‎|thumb|320px|The meeting of the hemispheres - East is right, West is left.]]  

[[Image: Greenwich_Meridian_Line.jpg‎|thumb|320px|The meeting of the hemispheres - East is right, West is left.]]