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Encyclopedia Britannica



UMBRA (Lat. for shade or shadow)

This article appears in Volume V27, Page 576 of the Encyclopedia Britannica.

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


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