..., penumbra, partial shadow... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...He was enjoying his meal when he happened to lookup, and saw that the penumbra at the edge of the lighted zone was densewith beetles...
Victor Rousseau 「Astounding Stories of Super-Science January 1930」
...The darkest portion of the penumbra is its external edge, whichstands out conspicuously against the adjoining bright surface of theSun...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...One penumbra will sometimes enclose several umbræ whilst the nucleimay be entirely wanting...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...13, in which the dark centralnucleus appears in sharp contrast with the lighter margin or penumbra...
Robert Stawell Ball 「The Story of the Heavens」
...The penumbra of a spot was formed by the thinner parts of theatmosphere about the vacancy which surrounded the nucleus...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
... The time occupied by the Moon in passing throughthe penumbra, before and after a lunar eclipse, will generallyrun to about an hour for each passage...
George Chambers 「The Story of Eclipses」
...Wherever the penumbra falls there will be a solareclipse of some kind, and the nearer the place is to the axisof the penumbra, the more nearly total will be the eclipse...
George C. Comstock 「A Text-Book of Astronomy」
...Grover has not only seen theabove-named features, but even a penumbra to the shadow on the ringswith a 2-inch telescope...
Richard A. Proctor 「Half-hours with the Telescope」
...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 two atmospheric layers, which will be of varying thickness about aspot, will account for all the shades of darkness seen in the penumbra...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...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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