However, in locations around the poles that experience polar night during the winter months, the Sun may reach an angle of 6-18 degrees below the horizon around midday. Within the polar circles, the Sun does not set at all in the summer, so there is no twilight during that time of the year. In Europe, it covers Denmark and southern Norway.Īn all-night period of nautical twilight does not constitute a white night, which requires the Sun to remain less than 6 degrees below the horizon all night, causing civil twilight from sunset to sunrise. In the Northern Hemisphere, this roughly correlates with the northern half of the Canadian province of Alberta, beginning just north of Edmonton. The area experiencing all-night nautical twilight around the summer solstice lies between about 54☃3′ and 60☃3′ North and South. Timing of nautical twilight where you are Twilight Around the PolesĪt high latitudes and around the summer solstice, the Sun does not move lower than 18 degrees below the horizon, so twilight can last from sunset to sunrise. ![]()
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