• Science • People
Non User
 • Locations • Timeline
Index: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Home > Umbra

:A different sense of the word "umbra", used in mathematics, is explained in the article titled umbral calculus.

The umbra ( Latin for shadow) is the darkest part of a shadow. From within the umbra, the source of light is completely blocked by the object causing the shadow. This contrasts with the penumbra where the light source is not completely blocked and there is only a partial shadow.

The umbra is also the comparatively dark central region of a sunspot.

See also eclipse.

The word is in the famous Latin phrase Pulvis et umbra sumus (dust and shadow we are) from Horace (Quintus Horatius Flaccus), Carmina (Book IV, 7, 16)



Read more »

Topics: Umbral Calculus, Umbra (World Of Darkness), Umbral...

UmbraA different sense of the word "umbra", used in mathematics, is explained in the article titled umbral calculus. The umbra ( Latin for shadow) is the darkest part of a shadow. From within the umbra, the source of light is completely blocked by the object cUmbral calculusIn mathematics, before the 1970s, the term umbral calculus was understood to mean the techniques introduced in the 19th century that are sometimes called Blissard's symbolic method sometimes attributed to James Joseph Sylvester, who used the technique extUmbra (World of Darkness)The Umbra is the spirit world, a shadow or reflection of the real world, in the World of Darkness role-playing game setting. It is inhabited by spirits, gods, and ghosts. Different supernatural types can reach the Umbra in different ways. The trick is eas
UmbralUmbral is derived from the Latin umbra meaning " shadow". It is also the Spanish word for "threshold", and sometimes used a surname in that language. See the following articles: Umbral calculus Umbra Francisco Umbral.  
Non User