Online Encyclopedia

UMBRA (Lat. for shade or shadow)

Online Encyclopedia
Originally appearing in Volume V27, Page 576 of the 1911 Encyclopedia Britannica.
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UMBRA (
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Lat. for shade or
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shadow)  , in
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astronomy, the completely dark portion of the
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shadow of a heavenly
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body, filling the space within which the
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sun is entirely hidden . The body being supposed spherical, the
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umbra is a
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cone circumscribing both the sun and the body that casts the shadow . The
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term is also given to the interior and darkest
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part of a sunspot .

End of Article: UMBRA (Lat. for shade or shadow)
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