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Sunset is the time when the sun disapears below the horizon in the west. Sunsets are often more colorful than sunrise. sunset is often associated with summer, beach living and surfing culture. This may be due in the first instance to people spending more time outdoors in the evening during summer than during winter, and also because pictures of sunsets over the sea are often more spectacular than daytime beach scenes

Timeing:
The timing of sunset varies with the time of year and the latitude of the location from which it is viewed.Changes in timing of sunset are driven by the axial tilt of Earth, and the planet's movement in its annual orbit around the sun.Even on the equator, sunrise and sunset shift several minutes back and forth through the year

Why Sunsets Happen :
The red hues of the sky at sunset and sunrise are caused by Mie Scattering. The colors of the sky throughout the day and at sunrise and sunset, are explained by both Rayleigh Scattering and Mie Scattering. The colour of the sky described by Rayleigh Scattering applies to the hues of blue, violet and green, not to the reds, oranges, peaches and purples of sunrise and sunset. Rayleigh Scattering is scattering of shorter wavelength light, like blue or violet, by air atoms and molecules. The magnitude or strength of Rayleigh Scattering varies in wavelength, and hence does not explain the beautiful variations of reds, purples, oranges and peachy colors. The latter colors arise from Mie Scattering, low angle scattering of light off dust, soot, smoke, and ash particles. Mie Scattering is beautifully recognizable down-wind of and after dust storms, forest fires and volcanic eruptions that inject large quantities of fine particulate matter into the atmosphere.
 
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