Information AboutMidnight Sun |
| CATEGORIES ABOUT MIDNIGHT SUN | |
| earth phenomena | |
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, Norway .]] with surroundings in Tromsø illuminated by the midnight sun.]] , Finland .]] The midnight sun is a Phenomenon occurring in Latitude s north and nearby to the south of the Arctic Circle and south and nearby to the north of the Antarctic Circle where the Sun remains visible at the local midnight. Given fair weather, the sun is visible for a continuous 24 hours, mostly north of the Arctic circle and south of the Antarctic Circle. The number of days per year with potential midnight sun increases the further poleward one goes. Since there are no permanent human settlements south of the Antarctic Circle, the countries and territories whose population experiences it are limited to the ones crossed by the Arctic Circle, i.e. Alaska , Canada , Greenland , Norway , Sweden , Finland , Russia , and extremities of Iceland . A quarter of Finland 's territory lies north of the Arctic Circle and at the country's northernmost point the sun does not set for 73 days during summer. In Svalbard , Norway, the northernmost inhabited region of Europe , there is no sunset from approximately April 19th to August 23rd. The extreme sites are the poles where the sun can be continuously visible for a half year. The opposite phenomenon, Polar Night , occurs in winter when the sun stays below the Horizon throughout the day. Since the Earth 's axis is tilted with respect to the Ecliptic by approximately 23 degrees 27 minutes, the sun does not set at high latitudes in (local) summer. The duration of the midnight sun increases from one day during the summer Solstice at the Polar Circle to approximately six months at the poles. At extreme latitudes, it is usually referred to as polar day. The length of the time when the sun is above the horizon varies from 20 hours at the Arctic Circle and Antarctic Circle to 186 days at the Poles . At the poles themselves, the sun only rises once and sets once, each year. During the six months when the sun is above the horizon at the poles, the sun spends the days constantly moving around the horizon, reaching its highest circuit of the sky at the summer solstice. Due to refraction, the midnight sun may be experienced at latitudes slightly below the polar circle, though not exceeding one degree (depending on local conditions). For example, it is possible to experience the midnight sun in Iceland, even though most of it ( Grímsey being a notable exception) is slightly south of the Arctic Circle. Even the northern extremities of the British Isles (and those places on similar latitudes) experience a permanent "dusk" or glare in the northern skies at these times. WHITE NIGHT in Saint Petersburg , drawn at white night.]] Locations above 60 degrees latitude that are south of the Arctic Circle or north of the Antarctic Circle experience midnight civil Twilight instead. The sun is at the horizon to 6 degrees below the horizon, so that daytime activities, such as reading, are still possible without artificial light, on the condition it is not cloudy. White nights have become a common symbol of Saint Petersburg , Russia , where they occur from about 11 June to 11 July , and the last 10 days of June are celebrated with cultural events. EFFECT ON PEOPLE Many find it difficult to fall asleep during the night when the sun is shining. In general, visitors and newcomers are most affected. Some natives are also affected, but in general to a lesser degree. The effect of the Polar Night , that is, not experiencing day for long durations of time is said to cause " Seasonal Affective Disorder " or S.A.D. a type of depression caused by lack of natural light. High-intensity daylight-spectrum lamps and tanning beds are a popular solution for relief from S.A.D. POPULAR CULTURE
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