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Penumbra 1

Definition: An incomplete or partial shadow.

Penumbra 2

Definition: 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 3

Definition: The part of a picture where the shade imperceptibly blends with the light.

penumbra 4

Definition: a fringe region of partial shadow around an umbra

 

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