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The reason of this different is because the earth is not round, the globe is a sphere flattened at both side so our planet should be wider at the equator. Chimborazo point one degree different to the equator due to it should have a height of 6384 km from the earth center (2 km higher than Mount Everest).
Information : http://www.npr.org/templates/story/story.php?storyId=9428163
Image : http://genesys33.files.wordpress.com/2008/05/chimborazo.jpg
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