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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.
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.
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.
The penumbra is a half-shadow that occurs when a light source is only partly covered by an object—for example, when the Moon obscures part of the Sun's disk. The other 2 areas are: Umbra – the shadow's dark center portion.
A partial shadow between regions of full shadow (the umbra) and full illumination, especially as cast by Earth, the Moon, or another body during an eclipse. During a partial lunar eclipse, a portion of the Moon's disk remains within the penumbra of Earth's shadow while the rest is darkened by the umbra.
/pəˈnʌmbrə/ /pɪˈnʌmbrə/ IPA guide. Other forms: penumbras; penumbrae. 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.
Definition of penumbra noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
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.
Penumbral definition: of, causing, or being the partial shadow outside the complete shadow of an opaque body, such as a planet, where the light from the source of illumination is only partly cut off. See examples of PENUMBRAL used in a sentence.
