Lectionary Calendar
Thursday, January 30th, 2025
the Third Week after Epiphany
the Third Week after Epiphany
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Bible Encyclopedias
Umbra
1911 Encyclopedia Britannica
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(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.)
Copyright Statement
These files are public domain.
These files are public domain.
Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Umbra'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/u/umbra.html. 1910.
Chisholm, Hugh, General Editor. Entry for 'Umbra'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/u/umbra.html. 1910.
