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24 March 2011 Last updated at 13:14 GMT
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Time zones sometimes seem positively eccentric, affected as they are by
political, geographical and social changes in the real world.
But as irregular as they are, if you want to divide the world up into time
zones, you need a way to measure time.
Our science reporter Rebecca Morelle has been finding out more.
http://www.bbc.co.uk/news/science-environment-12787502
來源 : BBC News
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