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Every solar eclipse casts an umbra, the darker central area in which almost no light reaches the earth, and a penumbra, the area of partial shadow where part of the sun is still visible. Penumbra can thus be used to describe any "gray area" where things aren't all black and white.
The penumbra (from Latin paene 'almost, nearly' and umbra 'shadow') is the region in which only a portion of the light source is obscured by the occluding body, and an observer in the penumbra experiences a partial eclipse.
penumbra, (from Latin paene, “almost”; umbra, “shadow”), in astronomy, the outer part of a conical shadow cast by a celestial body, in which the light from the source is partially blocked—as compared to the umbra (q.v.), the shadow’s darkest, central part, where the light is totally excluded.
The penumbra is the shadow's lighter outer part. The look of a solar or lunar eclipse depends on which shadow is involved, the umbra, penumbra, or antumbra.
The part of the moon that remains in the penumbra receives some direct sunlight, and the glare is usually great enough to prevent your seeing the faint coppery glow of the part of the moon in the umbra.
Penumbra, in painting, drawing, &c., that point of a picture or drawing where the shade blends itself with the light... These gradations should be nearly imperceptible.
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