sky


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sky,

apparent dome over the earth, background of the clouds, sun, moon, and stars. The blue color of the clear daytime sky results from the selective scattering of light rays by the minute particles of dust and vapor in the earth's atmosphereatmosphere
[Gr.,=sphere of air], the mixture of gases surrounding a celestial body with sufficient gravity to maintain it. Although some details about the atmospheres of other planets and satellites are known, only the earth's atmosphere has been well studied, the science of
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. The rays with longer wavelengths (the reds and yellows) pass through most readily, whereas the shorter rays (the blues) are scattered. An excess of dust, especially in large particles, causes scattering of many rays besides the blue, and the sky "fades" and becomes whitish or hazy. The sky thus is clearest in winter, in the morning, after a rain, over a mountain, or over the ocean. Leonardo da Vinci experimented with light and attempted an explanation of the sky's blue color. The work on light and its behavior by Sir Isaac Newton, Lord Rayleigh, and other physicists provided explanations of rainbows, sky color, mirages, and other atmospheric phenomena.

What does it mean when you dream about the sky?

The sky usually signifies peace and freedom of expression when it is clear and blue. If cloudy and overcast, the sky may be forecasting sadness and trouble.

sky

[skī]
(astronomy)
In the daytime the apparent blue dome resting on the earth along the horizon circle; at night the blue becomes nearly black.

sky

1. the apparently dome-shaped expanse extending upwards from the horizon that is characteristically blue or grey during the day, red in the evening, and black at night
2. outer space, as seen from the earth
3. weather, as described by the appearance of the upper air
References in classic literature ?
As she drew near, brighter glowed the sky, hotter and hotter grew the air, till Ripple's leaf-cloak shrivelled up, and could no longer shield her from the heat; then she unfolded the white snow-flake, and, gladly wrapping the soft, cool mantle round her, entered through the shining arch.
So far and wide she searched among the caverns of the sea, and gathered all the brightest jewels shining there; and then upon her faithful Breeze once more went journeying through the sky.
So they led her to the lofty gate, and here, from sky to earth, a lovely rainbow arched its radiant colors in the sun.
rose again into the sky, like a swarm of big butterflies, and circled fighting and drove away out of sight again towards the east.
The descent of German air-ships towards the lower sky increased.
All the windows of the hotel hospital that had been shiningly reflecting blue sky and airships the moment before became vast black stars.
A minute later it had mounted into the sky, sailing toward the west, and the last they saw of Button-Bright he was still sitting in the middle of the shining globe and waving his sailor hat at those below.
No," answered Polychrome, smiling; "but Santa Claus promised to speak to my father as he passed through the sky.
At some distance away to his right it presented a clean, vertical profile against a background of blue sky to a point half the way down, and of distant hills hardly less blue, thence to the tops of the trees at its base.
One November afternoon, in the calm at the end of a rain-storm of several days' duration, when the sky was still completely overcast and the air was full of mist, I observed that the pond was remarkably smooth, so that it was difficult to distinguish its surface; though it no longer reflected the bright tints of October, but the sombre November colors of the surrounding hills.
Venus had risen above the branch, and the ear of the Great Bear with its shaft was now all plainly visible against the dark blue sky, yet still he waited.
While they were saying this, Laska, with ears pricked up, was looking upwards at the sky, and reproachfully at them.