civil twilight

civil twilight
: the period after sunset or before sunrise ending or beginning when the sun is about 6 degrees below the horizon and during which on clear days there is enough light for ordinary outdoor occupations

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civil twilight noun (astronomy)
The interval of time during which the sun is between the horizon and 6º below the horizon, morning and evening
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Main Entry:civil

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civil twilight,
the part of twilight that occurs, for computation purposes, when the sun's center is 6 degrees below the horizon, as distinguished from astronomical twilight, which is longer, lasting until the sun's center is 18 degrees below the horizon.

Useful english dictionary. 2012.

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