Why does each time zone extend 7 1/2 degrees on each side of central meridian rather than extending from 0 degrees to 15 degree?
http://www.google.com/search?q=time+zones+latitude&ie=utf-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a
There are several good sites here to research the answer for your question.
=)
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