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atmospheric refraction |
Also found in: Wikipedia | 0.03 sec. |
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atmospheric refraction [¦at·mə¦sfir·ik ri′frak·shən] (geophysics) The angular difference between the apparent zenith distance of a celestial body and its true zenith distance, produced by refraction effects as the light from the body penetrates the atmosphere. Any refraction caused by the atmosphere's normal decrease in density with height. 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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| With mercurial whimsy, this natural trickster -- atmospheric refraction -- toys with their shapes and colors, and reroutes their celestial tracks, in her near-to-the-horizon domain. This produces what we see as stellar twinkling, and it destroys the correlations on which interferometry depends unless the two receivers are under the same isoplanatic patch, the area in which the atmospheric refraction changes uniformly. |
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