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Twilight is the time between darkness and sunrise in the morning, and sunset and complete darkness in the evening, when there is light outside, but the Sun is below the horizon. There are 3 types of twilight: civil, nautical, and astronomical. Dubai skyline in twilight.
The amount of visible light on the longest day of the year in the Northern Hemisphere. Day length refers to the period from sunrise to sunset. Civil twilight refers to the time before sunrise and after sunset when the sun is 6Âº or less below the horizon.