Penumbra

Definition and stakes

George F. Chambers,  The Story of the Solar System

“ Very often we next notice some groups of little black spots, as if the luminous stratum was becoming thinner in such a way as to disappear little by little and leave a large black nucleus uncovered. At the commencement of the business there is usually no clearly defined penumbra. This developes itself gradually and acquires a regular outline, just as the spot itself often takes a somewhat circular form. ”
Source: Gutenberg

James Thomson,  The Seasons (Thomson) — Winter (1791)

“ Thro' the thick air; as cloath'd in cloudy storm,
Weak, wan, and broad, he skirts the southern sky;
And, soon descending, to the long dark night,⁠50
Wide-shading all, the prostrate world resigns.
Nor is the night unwish'd; while vital heat,
Light, life, and joy, the dubious day forsake.
Mean-time, in fable cincture, shadows vast,
Deep-ting'd and damp, and congregated clouds,⁠55
And all the vapoury turbulence of heaven
Involve the face of things.
”
Source: Wikisource

Portrait of E. Pauline Johnson E. Pauline Johnson,  Flint and Feather (1914)—Part III. Other Poems… (1914)

“ Your splendid eyes, so full of clouds, wherein a shadow tries
To overcome the flame that melts into the world of grey,
As coming suns dissolve the dark that veils the edge of day.
Cool drifts the air at dawn of day, cool lies the sleeping dew,
But all my heart is burning, for it woke from dreams of you;
And O! these longing eyes of mine look out and only see
A dying night, a waking day, and calm on all but me.
”
Source: Wikisource

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