Penumbra

Astronomical Dictionary

The partial shadow or darkness of an eclipse. Means, literally, "dim light". It most often refers to the outer shadow cast during eclipses, and defines the region of shadow which gives rise to a partial eclipse. It is also the lighter area surrounding the central region of a sunspot.

 
Astronomical [1] [2] [3] [4] [5] [6] [7] [8] [9]

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