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prime grid meridian |
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prime grid meridian [′prīm ′grid mə‚rid·ē·ən] (navigation) The reference meridian of a grid; in polar regions it is usually the 180-0° geographic meridian, used as the origin for measuring grid longitude. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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