Alternate Definitions for Penumbra

include archived terms
Term: Penumbra
Definition:

The portion of a shadow in which light from an extended source is partially but not completely cut off by an intervening body; the area of partial shadow surrounding the umbra. The lighter part of a shadow during an eclipse. An observer standing in the penumbra of a Solar eclipse will see a partial eclipse.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
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