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'」
...A spot is usually composedof a dark central portion called the umbra, and a less dark fringearound this called the penumbra (, p...
Cecil G. Dolmage 「Astronomy of To-day」
...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」
...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 continued uponher disc for an hour afterwards...
George Chambers 「The Story of Eclipses」
...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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