..., penumbra, partial shadow... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...One penumbra will sometimes enclose several umbræ whilst the nucleimay be entirely wanting...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...When asun-spot has completed its period of existence, the photospheric matteroverwhelms the penumbra, and rushes into the umbra, which itobliterates, causing the spot to disappear...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...The penumbra of a spot is often found to be madeup of filaments directed towards the middle of the spot, and generallybrighter at their inner ends, where they adjoin the nucleus...
Robert Stawell Ball 「The Story of the Heavens」
...The shadow of the third has a considerable penumbra, andeven that of the first is not wholly black...
Richard A. Proctor 「Half-hours with the Telescope」
...The penumbra attending the earth's shadow is usually supposed to render this observation uncertain to two or three minutes of time, or more than half a degree of longitude...
Matthew Flinders 「A Voyage to Terra Australis」
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