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Bookmark or Share- penumbra - Wiktionary, the free dictionaryLearn the meaning, pronunciation, and usage of the word penumbra in English and other languages. Penumbra is a partially shaded area around a shadow, especially an eclipse, or an area of uncertainty or intermediacy.
- A lunar eclipse is coming on May 5. Here's what you need to knowA penumbral eclipse occurs when the moon passes into Earth's outer shadow, dimming but not disappearing. Learn how to observe this rare event and when it will be visible from different regions of...
- Umbra, penumbra and antumbra - WikipediaThe 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.
- Penumbral Definition & Meaning - Merriam-Webster1. 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.
- Penumbral - definition of penumbral by The Free Dictionary1. A partial shadow, as in an eclipse, between regions of complete shadow and complete illumination. 2. The diffuse outer part of a sunspot. 3. 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.). 4.
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