Assertion: penumbra | /r/HasProperty | partial shadow
Facets:
Source sentences:
text: A penumbra is a partial shadow that appears where light from part of the source is blocked and light from another part of the source is not blocked and filters through.
text: This is the entrance into the “penumbra” (or “Partial shade”).
text: A penumbra is the partial shadow cast onto one celestial body (e.g., the Earth) when another celestial body (e.g., the Moon) partically but not completely occludes light from a source (e.g., the Sun).
text: The umbra is the complete shadow; the penumbra is the partial shadow.