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- DictionaryUm·bra/ˈəmbrə/
noun
- 1. the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse.
a. : 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. b. : the central dark part of a sunspot.
The darkest part of a shadow, especially the cone-shaped region of full shadow cast by Earth, the Moon, or another body during an eclipse. In a full lunar eclipse, which generally lasts for one or two hours, the entire disk of the Moon is darkened as it passes through the umbra.
UMBRA meaning: 1. the dark inner part of a shadow in which all light is blocked, used especially about a shadow…. Learn more.
UMBRA definition: 1. the dark inner part of a shadow in which all light is blocked, used especially about a shadow…. Learn more.
The very darkest part of a shadow is the umbra. It's where the light source is completely blocked by the object in front of it. You'll most often encounter the word umbra in astronomy, along with penumbra and sometimes antumbra.
The umbra is a central cone of darkness that tapers away from Earth while the penumbra is much lighter and spreads out from the edges of the umbra.
Jun 13, 2024 · umbra (plural umbras or umbrae or (obsolete) umbræ) The fully shaded inner region of a shadow cast by an opaque object. ( astronomy) The area on the earth or moon experiencing the total phase of an eclipse. ( astronomy) The central region of a sunspot. (chiefly literary) A shadow.
Umbra Definition. Shade or a shadow. The dark central cone of shadow projecting from a planet or satellite on the side opposite the sun. A perfect or complete shadow, in which no direct light is received from the source of illumination. The dark central part of a sunspot.
Definition of umbra noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
1. a region of complete shadow resulting from the total obstruction of light by an opaque object, esp the shadow cast by the moon onto the earth during a solar eclipse. 2. the darker inner region of a sunspot. Compare penumbra.
