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circle of illumination |
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circle of illumination [′sər·kəl əv ə‚lü·mə′nā·shən]
(geology) The edge of the sunlit hemisphere, which forms a circular boundary separating the earth into a light half and a dark half. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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