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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 …

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 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..

The penumbra is the lighter outer part of a shadow. The Moon's penumbra causes partial solar eclipses, and the Earth's penumbra is involved in penumbral lunar eclipses.

In a lunar eclipse, the outer shadow or penumbra is a zone where Earth blocks a portion of the sun's rays.

Nov 17, 2025 · 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 …

If the source of light be a point, the shadow is sharply defined; if the source be a luminous surface, the perfect shadow is fringed by an imperfect shadow called a penumbra.

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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.).