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- Dictionarypenumbra/pɪˈnʌmbrə/
noun
- 1. the partially shaded outer region of the shadow cast by an opaque object.
- 2. a peripheral or indeterminate area or group: "an immense penumbra of theory surrounds any observation"
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PENUMBRA definition: 1. a part of a shadow in which only some of the light is blocked, used especially about a shadow…. Learn more.
The penumbra (from the 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. An observer in the penumbra experiences a partial eclipse.
1. a. : a space of partial illumination (as in an eclipse) between the perfect shadow on all sides and the full light. b. : a shaded region surrounding the dark central portion of a sunspot. 2. : a surrounding or adjoining region in which something exists in a lesser degree : fringe.
noun Word forms: plural peˈnumˌbrae (pɪˈnʌmˌbri ) or peˈnumbras. 1. the partly lighted area surrounding the complete shadow (umbra) of a body, as the moon, during an eclipse. 2. the less dark region surrounding the dark central area of a sunspot. 3. a vague, indefinite, or borderline area.
The partially shaded region around the shadow of an opaque body, when the light source is larger than a point source and only part of its light is cut off (contrasted with the full shadow or umbra); (esp. in Astronomy) that of the shadow cast by the moon on the earth in a solar eclipse, or by the earth on the moon in a lunar eclipse, resulting i...
PENUMBRA meaning: 1. a part of a shadow in which only some of the light is blocked, used especially about a shadow…. Learn more.
penumbra. When you measure your shadow to calculate the angle of the sun in the sky, be sure to measure to the edges of your shadow, to the penumbra, the part of a shadow that is not as dark as the center.
Jun 2, 2024 · penumbra (plural penumbras or penumbrae or (obsolete) penumbræ) A partially shaded area around the edges of a shadow, especially an eclipse. 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.
1. a. 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. b. the grayish marginal portion of a sunspot. 2. a shadowy, indefinite, or marginal area.
Definition of penumbra noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
