Umbra

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

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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 only partially blocked and there is only a partial shadow.

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

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Latin: Latin is an Indo-European language originally spoken in the region around Rome called Latium. It gained great importance as the formal language of the Roman Empire. All Romance languages are descended from Latin, and many words based on Latin are found in other modern languages such as English. The ...

Shadow: :This article is about the optical phenomenon; for other meanings, see Shadow (disambiguation)....

Light: Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific setting, electromagnetic radiation of any wavelength. The three basic dimensions of light (i.e., all electromagnetic radiation) are:...