The meaning of UMBRA is a conical shadow excluding all light from a given source; specifically : the conical part of the shadow of a celestial body excluding all light from the primary source.

The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object of lesser size. In cases of equal or smaller impinging objects, …

UMBRA definition: shade; shadow. See examples of umbra used in a sentence.

There are three distinct parts of a shadow created by any non-point light source after impinging on an opaque object called the umbra, penumbra and antumbra.

Definition of umbra noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Oct 13, 2025 · Umbra is a term used in astronomy to describe the darkest part of a shadow. It is the region where the light source is completely blocked by an opaque object, resulting in a total absence …

Define umbra. umbra synonyms, umbra pronunciation, umbra translation, English dictionary definition of umbra. umbra n. pl. um·bras or um·brae 1. A dark area, especially the blackest part of a shadow …

Definition of 'umbra' umbra in American English (ˈʌmbrə ) noun Word forms: plural umbrae (ˈʌmbri ) or umbras Origin: L, a shade, shadow

Dec 26, 2025 · In order to set up such an algorithm, we need the notion of multiplicative inverse of an umbra. Two umbrae are said to be multiplicative inverse to each other when αγ ≡ u.

The umbra is the darkest part of a shadow, where the light source is completely blocked. It is a crucial concept in understanding eclipses of the Sun and Moon, as well as solar activity above the …