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Twilight | Almanac.com

Twilight

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Twilight
The interval of time following sunset and preceding sunrise, during which the sky is partially illuminated. The three ranges of twilight are: civil (from sunset/sunrise to when the Sun is 6° below the horizon) nautical (greater than 6° and ending at 12°) astronomical (greater than 12° and ending at 18°—full darkness).

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