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dcterms modified equal to or less than 2020-11-17T19:19:56.818Zequal to or more than 2020-11-17T19:19:56.818Z
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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.
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contributor AAS_Frey.Katie original