Erin Jacobs
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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.
PENUMBRA definition: 1. a part of a shadow in which only some of the light is blocked, used especially about a shadow…. Learn more.
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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 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.
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. noun. /pəˈnʌmbrə/ (specialist) an area of shadow which is between fully dark and fully light. Questions about grammar and vocabulary? Find the answers with Practical English Usage online, your indispensable guide to problems in English.
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 ...
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