Sky Wallpaper

Sky the space above the surface of the Earth or any other astronomical object. In general a panorama that opens when viewed from this object in the direction of the cosmos.

The type of the earth's sky depends on the time of the day the time of the year and the main weather. It often sees clouds and a satellite of the Earth the Moon. The appearance of the earth's sky from an airplane flying above the rain clouds can differ substantially from its type at this time from the earth's surface.

The cloudless daytime skies are painted blue. During sunrise and sunset in the sky shades of yellow orange and red colors appear and occasionally one can see a green ray.

At night blue and blue color of the sky is replaced by dark blue see below. You can clearly see the moon the stars and other astronomical objects. The starry sky is a collection of luminaries visible at night or at dusk in the firmament.

The cloudless daytime sky looks blue because air or rather suspended particles and density fluctuations in it scatter shortwave light stronger than longwave. Thanks to this if we look at the portion of heaven outside the sun we will see the blue color the result of mixing a large amount of blue and violet and a small number of other colors. The red color of the sunset is also explained by the scattering of light. During sunset and dawnA light wave passes a much larger path in the atmosphere along a tangent to the earth's surface than a day in the vertical direction. Because of this most of the blue and even green light goes to the sides while the direct light of the sun as well as the clouds and skies illuminated by it near the horizon are painted in red tones.

Scattering and absorption are the main causes of the attenuation of light in the atmosphere. Scattering varies as a function of the ratio of the diameter of the scattering particle to the wavelength of light. When this ratio is less than 1/10 Rayleigh scattering occurs at which the scattering coefficient is inversely proportional to the fourth power of the wavelength. At large values ​​of the ratio of the particle diameter to the wavelength the scattering varies according to the Mie theory. When this ratio is greater than 10 the laws of geometric optics begin to work.

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