will begin with night, astronomical twilight, nautical twilight, and civil twilight in that order (with each successive phase including more light than the last). Following civil twilight, the day will progress through the other phases in the opposite order (nautical twilight, then astronomical twilight, then night to end the day).

Civil polar twilight

Civil polar twilight occurs at latitudes roughly between 67° 24' and 72° 34' North or South, where the Sun will be below the horizon all day on the winter solstice,

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