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penumbra |
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penumbra (pĭnŭm`brə): see eclipse eclipse (ēklĭps`, ĭ–) [Gr. ..... Click the link for more information. ; sunspots sunspots, dark, usually irregularly shaped spots on the sun's surface that are actually solar magnetic storms. The Chinese recorded dark features on the sun seen with the naked eye in 28 B.C. ..... Click the link for more information. . penumbra 1. a fringe region of half shadow resulting from the partial obstruction of light by an opaque object 2. Astronomy the lighter and outer region of a sunspot 3. Painting the point or area in which light and shade blend penumbra [pə′nəm·brə] (astronomy) The outer, relatively light part of a sunspot. (optics) That portion of a shadow illuminated by only part of a radiating source. 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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