When you measure your shadow to calculate the angle of the sun in the sky, be sure to measure to the edges of your shadow, to the penumbra, the part of a shadow that is not as dark as the center.
An incomplete or partial shadow.
Noun
a fringe region of partial shadow around an umbra
n.
An incomplete or partial shadow.
n.
The shadow cast, in an eclipse, where the light is
partly, but not wholly, cut off by the intervening body; the space of
partial illumination between the umbra, or perfect shadow, on all
sides, and the full light.
n.
The part of a picture where the shade imperceptibly
blends with the light.
Penumbra
An incomplete or partial shadow.
Usage Examples
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