page_title: Umbra, penumbra and antumbra
hierarchical_section_title: Umbra, penumbra and antumbra
caption_attribution_description: Diagram of umbra, penumbra and antumbra in a two-body system.
context_page_description: The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam of light, only the umbra is cast.
  These names are most often used for the shadows cast by celestial bodies, though they are sometimes used to describe levels, such as in sunspots.
context_section_description: The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast.
  These names are most often used for the shadows cast by celestial bodies, though they are sometimes used to describe levels, such as in sunspots.
caption: Umbra, penumbra and antumbra of Earth and images that could be seen at some points in these areas (note: the relative size and distance of the bodies shown are not to scale).
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