Entity: UMBRA
UMBRA refers to the darkest part of a shadow, such as the cone-shaped region of full shadow cast by Earth, the Moon, or another celestial body during an eclipse.
UMBRA
Etymology
Originating in the 1590s from Latin 'umbra' meaning 'shade, shadow,' UMBRA means a ghostly shadow or an eclipse shadow, also an uninvited guest.
Definition
UMBRA refers to 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.
Historical Context
The concept of UMBRA has been used in astronomy and physics to describe the shadowy regions cast by celestial bodies during eclipses, shedding light on the intricate play of light and shadow in the cosmos.
Cultural Significance
In various cultures, shadows have been associated with mystery, the supernatural, and the unknown. The UMBRA, as the darkest part of a shadow, holds symbolic significance in art, literature, and folklore.
Related Concepts
Other related concepts include penumbra (the partially shaded outer region of a shadow) and antumbra (the region beyond the penumbra where the light source is not fully blocked).
See Also
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.