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There are actually three identified shadow regions in an eclipse; Umbra, penumbra, and antumbra.

The umbra is the region where the light is totally obscured.

The penumbra (partially shadowed) is the region of partial eclipse - the light is diminished, but not totally.

The antumbra is that rather more distant region in the Umbra, where the light source may be perceived as a circle. A lesser known term.

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11y ago

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