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The time of sunset is defined in astronomy as the moment when the trailing edge of the Sun’s disk disappears below the horizon. The ray path of light from the setting sun is highly distorted near the horizon because of atmospheric refraction, making the sunset appear to occur when the sun’s disk is already about one diameter below the horizon. Sunset is distinct from dusk, which is the time at which the sky becomes completely dark, which occurs when the sun is approximately eighteen degrees below the horizon. The period between sunset and dusk is called twilight.

Sunset creates unique atmospheric conditions such as the often intense orange and red colours of the sun and the surrounding sky.

[Ref: Wkipedia]

Sunset on the Chobe River, downstream of the town of Kasane northern Botswana, Southern Africa,

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