例文・使い方で印象づける「penumbra」の覚え方
スポンサーリンク..., 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」
...It is bordered onboth sides by the spectrum of the penumbra, which is much brighterthan that of the umbra, but fainter than that of the adjoining regionsof the sun...
Robert Stawell Ball 「The Story of the Heavens」
...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」
...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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