Topic
twilight.
illumination of the Earth's lower atmosphere when the Sun itself is not directly visible because it is below the horizon
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About twilight
Twilight is daylight illumination produced by diffuse sky radiation when the Sun is below the horizon as sunlight from the upper atmosphere is scattered in a way that illuminates both the Earth's lower atmosphere and also the Earth's surface. Twilight also may be any period when this illumination occurs, including dawn and dusk.
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