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Qu'est-ce (qui) est Penumbra - définition
DISTINCT PARTS OF A SHADOW
Penumbra; Antumbra; Soft shadows; Penumbral; Umbra and Penumbra; Umbra; Penumbras; Soft shadow
![Scale diagram of [[Earth's shadow]], showing how the umbral cone extends beyond the [[orbit of the Moon]] (the Moon is indicated by the yellow dot).](https://commons.wikimedia.org/wiki/Special:FilePath/Earth umbral cone (partial).png?width=200 "Scale diagram of [[Earth's shadow]], showing how the umbral cone extends beyond the [[orbit of the Moon]] (the Moon is indicated by the yellow dot).")
Penumbra
·noun An incomplete or partial shadow.
II. Penumbra ·noun The part of a picture where the shade imperceptibly blends with the light.
III. Penumbra ·noun The shadow cast, in an eclipse, where the light is partly, but not wholly, cut off by the intervening body; the space of partial illumination between the umbra, or perfect shadow, on all sides, and the full light.
penumbra
(penumbras)
A penumbra is an area of light shadow. (FORMAL)
N-COUNT
penumbra
[p?'n?mbr?]
¦ noun (plural penumbrae -bri: or penumbras)
1. the partially shaded outer region of the shadow cast by an opaque object, especially the area of the earth or moon experiencing a partial eclipse.
2. Astronomy the less dark outer part of a sunspot.
Derivatives
penumbral adjective
Origin
C17: mod. L., from L. paene 'almost' + umbra 'shadow'.
Wikipédia
Umbra, penumbra and antumbra
The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast.
These names are most often used for the shadows cast by celestial bodies, though they are sometimes used to describe levels, such as in sunspots.
Exemples du corpus de texte pour Penumbra
1. Has the United States formally recognised India as a legitimate nuclear power, or is India still in an undefined penumbra?
2. This is not the first time Schatten has found himself in the penumbra of an egg scandal.
3. As they wait, each family member tries to sort through the "penumbra of moral ambiguity" into which events have cast them.
4. Wade, the court said that a privacy right –– an "emanation" of a "penumbra" of other rights –– guarantees a right to abortion, but also said that right changes with each trimester of a pregnancy.
5. But 74 years later, a great Civil War had to be fought to defend the Constitution against states that would secede from the Union rather than acknowledge that a privacy right to abortion is an emanation loitering in the penumbra of other rights.