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Updated: May 21, 2025
Her steps became feebler, and she strained her eyes to look afar upon the naked road, now indistinct amid the penumbrae of night. At length her onward walk dwindled to the merest totter, and she opened a gate within which was a haystack. Underneath this she sat down and presently slept. When the woman awoke it was to find herself in the depths of a moonless and starless night.
Another consequence of this want of air is that absolute darkness reigns where the sun's rays do not penetrate. That which on earth is called diffusion of light, that luminous matter which the air holds in suspension, which creates the twilight and the daybreak, which produces the umbrae and penumbrae, and all the magic of chiaro-oscuro, does not exist on the moon.
Another consequence of this absence of air is the following: Absolute darkness reigns where the sun's rays do not penetrate. What is called diffused light upon the earth, the luminous matter that the air holds in suspension, which creates twilights and dawns, which produces shadows, penumbrae, and all the magic of the chiaro-oscuro, does not exist upon the moon.
From the top of the terrace he gazed upon this vague form standing up like a phantom in the penumbrae of the evening. At last she said to him: "Lead me to your tent! I wish it!" A recollection which he could not define passed through his memory. He felt his heart beating. The air of command intimidated him. "Follow me!" he said.
When the ascending currents are powerful, they create those appearances which astronomers designate the nuclei, the penumbrae, the faculae. Such was Herschel's explanation of the mode of formation of the solar spots; and allowing it to be well-founded, we must expect to find what is, indeed, the case that the Sun does not always and regularly pour forth equal quantities of light and heat.
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