|
( Umbra)
For other uses of the word "umbra", see Umbra (disambiguation). The umbra, penumbra and antumbra are the names given to the three distinct parts of a shadow which are created when the source of light is not a point source. These names are usually used when referring to the shadows cast by celestial bodies. In reality there is no such thing as a point source radiator, though in theory such a light source would cast an umbra and penumbra, but not an antumbra. The umbra (Latin shadow) is the darkest part of a shadow. From within the umbra, the source of light is completely concealed by the occulting body. In astronomy, an observer in the umbra is said to be experiencing a total eclipse.
|
Umbra Subcategories
Umbra Articles
|
| 
