The sunset or the swastamita is the time when the sun disappears below the horizon line to the west. The red color in the sky at sunset and rising is caused by a combination of blue Rayleigh spreading and density of Earth's atmosphere.
Not many know about the phenomenon of this mirage sunset, the phenomenon called "Mirage Sunset" is a phenomenon where two or more sun shadows are visible when the sun's light when position is low refraction (deflected) between layers of air with different temperatures.
Usually the temperature of the air decreases gradually as the altitude increases. The thing that we often see later is the slightly flat sun. Mirage requires more temperature variations.
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