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penumbra

partial shadow between the entirely dark and fully illuminated spaces that is generated during eclipses

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About penumbra

The umbra, penumbra and antumbra are three distinct parts of a shadow, made by any light source after impinging on an opaque object of lesser size. In cases of equal or larger impinging objects, only an umbra and penumbra are generated. Assuming no diffraction, for a collimated beam of light, only the umbra is cast.

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Facts from Wikidata (CC0).

Not who you're looking for? Others named penumbra: French metal gothic band · legal term for the group of rights derived, by implication, · telenovela · episode of Star Trek: Deep Space Nine (S7 E17)

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