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apparent horizon |
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apparent horizon [ə′pa·rənt hə′rīz·ən] (astronomy) (relativity) The boundary of a region in space-time in which the gravitational field is so strong that the cross-sectional area of an outgoing light pulse decreases. 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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The degree of cloudiness is defined as that fraction of the sky above the local apparent horizon that is covered by clouds. |
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