Concept information
Preferred 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. (en)
Broader concept
- Eclipses (en)
Entry terms
- Penumbras (en)
Editorial note
URI
http://astrothesaurus.org/uat/1205
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