“I ask how far away the eye can discern a non-luminous body, as, for instance, a mountain. It will be very plainly visible if the sun is behind it; and could be seen at a greater or less distance according to the sun's place in the sky.”

— Leonardo Da Vinci

The Notebooks of Leonardo da Vinci (1883), IV Perspective of Disappearance

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Leonardo Da Vinci 363

Italian Renaissance polymath 1452–1519

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“I find that any luminous body when seen through a dense and thick mist diminishes in proportion to its distance from the eye. Thus it is with the sun by day, as well as the moon and the other eternal lights by night. And when the air is clear, these luminaries appear larger in proportion as they are farther from the eye.”

Leonardo Da Vinci (1452–1519) Italian Renaissance polymath

The Notebooks of Leonardo da Vinci (1883), IV Perspective of Disappearance

“A luminous body when obscured by a dense atmosphere will appear smaller; as may be seen by the moon or sun veiled by fogs.”

Leonardo Da Vinci (1452–1519) Italian Renaissance polymath

The Notebooks of Leonardo da Vinci (1883), IV Perspective of Disappearance

“According to my theory, a dark spot in the sun is a place in its atmosphere which happens to be free from luminous decompositions”

William Herschel (1738–1822) German-born British astronomer, technical expert, and composer

above it
Source: Sir William Herschel: His Life and Works (1880), Ch.4 "Life and Works" quote from his paper "Nature and Construction of the Sun and Fixed Stars" (1795).

“The light of conscience … enters the eyes of the soul, as the light of the sun enters the eyes of the body; and to open the former requires no greater effort than to open the latter.”

Alexandre Vinet (1797–1847) Swiss theologian

Evangelical Meditations (1858)

“How glorious a greeting the sun gives the mountains!”

John Muir (1838–1914) Scottish-born American naturalist and author

Source: 1890s, The Mountains of California (1894), chapter 4: A Near View of the High Sierra

“The sun beyond the mountains glows;
The Yellow River seawards flows.
You can enjoy a grander sight
By climbing to a greater height.”

Xu Yuanchong (1921) Translator of Chinese poetry

Wang Zhi-huan, "On the Heron Tower"
Song of the Immortals: An Anthology of Classical Chinese Poetry (1994)

“People ask the way to Cold Mountain.
Cold Mountain? There is no road that goes through.
Even in summer the ice doesn't melt;
Though the sun comes out, the fog is blinding.
How can you hope to get there by aping me?
Your heart and mine are not alike.
If your heart were the same as mine,
Then you could journey to the very center!”

Han-shan Chinese monk and poet

Cold Mountain: 100 Poems by the T'ang Poet Han-shan

“Should there really be suns in the whole infinite space, they can be at approximately the same distance from one another, or distributed over galaxies, hence would be in infinite quantities, and consequently the whole sky should be as bright as the sun. Clearly, each line which can conceivably be drawn from our eye will necessarily end on one of the stars and each point on the sky would send us starlight, that is, sunlight.”

Heinrich Wilhelm Matthäus Olbers (1758–1840) German physician and astronomer

Sind wirklich im ganzen unendlichen Raum Sonnen vorhanden, sie mögen nun in ungefähr gleichen Abständen von einander, oder in Milchstrassen-Systeme vertheilt sein, so wird ihre Menge unendlich, und da müsste der ganze Himmel ebenso hell sein, wie die Sonne. Denn jede Linie, die ich mir von unserm Auge gezogen denken kann, wird nothwendig auf irgend einen Fixstern treffen, und also müßte uns jeder Punkt am Himmel Fixsternlicht, also Sonnenlicht zusenden.
Olbers' paradox, expressed in [Ueber die Durchsichtigkeit des Weltraums, Astronomisches Jahrbuch für das Jahr 1826, J. Bode. Berlin, Späthen 1823, 110-121]

“In the desert, initially, everywhere is like everywhere else—sky, sand, mountains. So far, this was the extent of what I’d seen in my involuntary roost. Then the day began to ebb, the world turned to topaz and gold, and the color of the sky seemed to sink away into the disc of the sun. I found I really could touch the beauty of it then, as I had touched its beauty so long ago when I was free to travel where I wished, and the city still owned me. Now, tinged with my sorrow, the loveliness was bittersweet, but strong as wine.”

Tanith Lee book Drinking Sapphire Wine

Part 2, Chapter 3 (pp. 69-70)
Drinking Sapphire Wine (1977)

“His zeal in the cause of my race was far greater than mine - it was as the burning sun to my taper light - mine was bounded by time, his stretched away to the boundless shores of eternity. I could live for the slave, but he could die for him.”

Frederick Douglass (1818–1895) American social reformer, orator, writer and statesman

Regarding John Brown, address at the 14th anniversary of Storer College http://www.wvculture.org/history/jbexhibit/bbspr05-0032.html (30 May 1881)
1880s, Address at the Anniversary of Storer College (1881)

“I ask how far away the eye can discern a non-luminous body, as, for instance, a mountain. It will be very plainly visible if the sun is behind it; and could be seen at a greater or less distance according to the sun's place in the sky.”

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Leonardo Da Vinci 363

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