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Summer night in the city of Pori, Finland on July 2, 2010. The term "midnight sun" refers to the consecutive 24-hour periods of sunlight experienced north of the Arctic Circle and south of the Antarctic Circle. Other phenomena are sometimes referred to as "midnight sun", but they are caused by time zones and the observance of daylight saving time.
Because of Anchorage's high latitude, summer days are very long and winter daylight hours are very short. The longest day of sunlight being 18hrs and 21 minutes, and shortest being 5 hours and 28 minutes. [3] Anchorage is often cloudy during the winter, which decreases the amount of sunlight experienced by residents.
The sun does not rise at all during some weeks in the winter, and is out for 24 hours during some weeks in the summer. However, despite 24 hours of sunshine in the summertime, the average low temperature is barely above freezing in Utqiaġvik in July, at 36 °F (2.2 °C) and snow may fall any month of the year. [ 4 ]
At 2:16 a.m., the sun finally dipped below the horizon, marking the first official night in 83 days for Utqiaġvik, Alaska, the northernmost town in the United States.
Sunshine duration is usually expressed in hours per year, or in (average) hours per day. The first measure indicates the general sunniness of a location compared with other places, while the latter allows for comparison of sunshine in various seasons in the same location. [1]
Ruka, Finland at noon in December. The length of polar night varies by latitude, from 24 hours just inside the polar circles to 179 days at the poles. As mentioned, a location experiencing polar night does not mean that the location will be in full darkness; in many cases, due to sunlight being refracted over the horizon, a location experiencing polar night may be in one of the various phases ...
Summer solstice. The summer solstice or estival solstice[ i] occurs when one of Earth 's poles has its maximum tilt toward the Sun. It happens twice yearly, once in each hemisphere ( Northern and Southern ). For that hemisphere, the summer solstice is the day with the longest period of daylight and shortest night of the year, when the Sun is at ...
By the end of October, the amount of sunlight is around 6 hours. When the sun sets on November 18, it stays below the horizon until January 23, resulting in a polar night that lasts for about 66 days. [37] When the polar night starts, about 6 hours of civil twilight occur, with the amount decreasing each day during the first half of the polar ...
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