Online Encyclopedia

PENUMBRA (Lat. paene, almost, umbra, ...

Online Encyclopedia
Originally appearing in Volume V21, Page 124 of the 1911 Encyclopedia Britannica.
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PENUMBRA (Lat. paene, almost, umbra, a shadow), in astronomy, the partial shadow of a heavenly body as cast by the sun. It is defined by the region in which the light of the sun is partially but not wholly cut off through the interception of a dark body. (See ECLIPSE.)
End of Article: PENUMBRA (Lat. paene, almost, umbra, a shadow)
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