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penumbral$550634$ - translation to greek
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).")
penumbral
σκιόφωτος
Definition
penumbra
(penumbras)
A penumbra is an area of light shadow. (FORMAL)
N-COUNT
Wikipedia
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.
