Wednesday, July 27, 2016

Wednesday: Penumbra

penumbra |peˈnəmbrənoun (pl. penumbrae |-brē-brīor penumbrasthe partially shaded outer region of the shadow cast by an opaque object.• Astronomy the shadow cast by the earth or moon over an area experiencing a partial eclipse.• Astronomy the less dark outer part of a sunspot, surrounding the dark core.DERIVATIVES penumbral |-brəladjectiveORIGIN mid 17th cent.modern Latin, from Latinpaene almost + umbra shadow.
Not all shadows are created equal.

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