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. …

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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.

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 …

U.S. Law. a right or set of rights implicit but not expressed in the U.S. Constitution or Bill of Rights. The principle of the penumbra protects against an imperfect, or incomplete, enumeration of …

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.

Definition of penumbra noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

In a lunar eclipse, the outer shadow or penumbra is a zone where Earth blocks a portion of the sun's rays. You can also find related words, phrases, and synonyms in the topics: The moon …

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.).