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See also:UMBRA (See also:Lat. for shade or See also:shadow) , in See also:astronomy, the completely dark portion of the See also:shadow of a heavenly See also:body, filling the space within which the See also:sun is entirely hidden . The body being supposed spherical, the See also:umbra is a See also:cone circumscribing both the sun and the body that casts the shadow . The See also:term is also given to the interior and darkest See also:part of a sunspot . |
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