| penumbra | 1. An incomplete or partial shadow. 2. <astronomy> The shadow cast, in an eclipse, where the light is partly, but not wholly, cut off by the intervening body; the space of partial illumination between the umbra, or perfect shadow, on all sides, and the full light. The faint shade surrounding the dark central portion of a solar spot is also called the penumbra, and sometimes umbra. 3. The part of a picture where the shade imperceptibly blends with the light. Origin: NL, fr. L. Paene almost + umbra shade. Source: Websters Dictionary (01 Mar 1998) |
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| penumbra |
a fringe region of partial shadow around an umbra
Ãâó: wordnet.princeton.edu/perl/webwn
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| penumbra |
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Ãâó: www.mercksource.com/pp/us/cns/cns_hl_dorlands.jspz...
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| penumbra |
In solar-terrestrial terms, the sunspot area that may surround the darker umbra or umbrae. It consists of linear bright and dark elements radial from the sunspot umbra.
Ãâó: weather.gov/glossary/glossary.php
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| penumbra |
A partial shadow that appears where light from part of the source is blocked and light from another part of the source is not blocked.
Ãâó: www.nksd.net/schools/nkhs/staff/john_daneau/cp_glo...
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| penumbra |
outer and lighter part of the shadow created by an eclipse.
Ãâó: school.discovery.com/curriculumcenter/solarsystem/...
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| penumbra | a fringe region of partial shadow around an umbra |
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