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Umbra, penumbra and antumbra - Wikipedia The penumbra (from Latin paene 'almost, nearly' and umbra 'shadow') is the region in which only a portion of the light source is obscured by the occluding body, and an observer in the penumbra experiences a partial eclipse
PENUMBRA Definition Meaning - Merriam-Webster Every solar eclipse casts an umbra, the darker central area in which almost no light reaches the earth, and a penumbra, the area of partial shadow where part of the sun is still visible Penumbra can thus be used to describe any "gray area" where things aren't all black and white
PENUMBRA Definition Meaning | Dictionary. com Penumbra definition: the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off
Penumbra - definition of penumbra by The Free Dictionary An area in which something exists to a lesser or uncertain degree: "The First Amendment has a penumbra where privacy is protected from governmental intrusion" (Joseph A Califano, Jr )
Ischemic penumbra | Radiology Reference Article | Radiopaedia. org Ischemic penumbra denotes the part of an acute ischemic stroke that is at risk of progressing to infarction but is still salvageable if reperfused It is usually located around an infarct core, which represents the tissue that has already infarcte
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Penumbra | Moon, Sun Shadow | Britannica penumbra, (from Latin paene, “almost”; umbra, “shadow”), in astronomy, the outer part of a conical shadow cast by a celestial body, in which the light from the source is partially blocked—as compared to the umbra (q v ), the shadow’s darkest, central part, where the light is totally excluded
penumbra - Wiktionary, the free dictionary penumbra (plural penumbras or penumbrae or (obsolete) penumbræ) The other places see the penumbra of the moon's shadow fall on the earth, so the eclipse is partial, and part of the sun's disc is still visible