Penumbra

The penumbra (Latin for mid-shadow) is the portion of a shadow that results from the source of illumination being only partially blocked. Penumbras only occur when the source of light is not a point-source. As the sun is a visible disc, solar shadows have penumbras. The penumbra part of a shadow is contrasted with the umbra part of the shadow in which the light source is completely blocked.

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The part of the penumbra where an annular eclipse is visible is called the antumbra.

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Also, the penumbra is the lighter, fuzzier outer edge of a shadow.

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The shadow is darkest at the umbra, near the object, and weakest at the penumbra, at the edge.

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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)....

Illumination: Illumination is either...

Penumbra related Images and Photos (experimental)

Penumbra II