例文・使い方で印象づける「penumbra」の覚え方
スポンサーリンク...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 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」
...The shadow of the fourth, for instance, isnearly all penumbra, the really black part being quite minute bycomparison...
Richard A. Proctor 「Half-hours with the Telescope」
...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 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 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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