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- Umbra, penumbra and antumbra - Wikipedia
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 penumbra experiences a partial eclipse
- PENUMBRA Definition Meaning - Merriam-Webster
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 can thus be used to describe any "gray area" where things aren't all black and white
- Eclipse Shadow: What Is the Penumbra? - timeanddate. com
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 | Moon, Sun Shadow | Britannica
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 Definition Meaning | Dictionary. com
A lunar eclipse happens when the Moon passes through the outer region of the Earth's shadow called the penumbra From BBC
- Penumbra - definition of penumbra by The Free Dictionary
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 )
- penumbra - Wiktionary, the free dictionary
penumbra (plural penumbras or penumbrae or (obsolete) penumbræ) A partially shaded area around the edges of a shadow, especially an eclipse quotations
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