Assertion: penumbra | /r/CapableOf | fall on the earth's surface
Facets:
Source sentences:
text: During some eclipses, the Sun, the Moon, and the Earth do not form a perfectly straight line, so only the penumbra falls on the Earth's surface while the umbra, the shadow's dark center, is cast into space.
text: the Moon's penumbra falls on the Earth's surface, and the observer is within the penumbra.