The midnight Sun it is an astronomical phenomenon that occurs in or near the polar regions, beyond the polar circle, and linked to the position of the sun on the horizon during the day.
To know
Near summer, due to the inclination of the earth's rotation axis, at latitudes above 66 ° 33 ′ the sun never drops below the horizon, and therefore night never falls. The parallels 66 ° 33 'North and South, which delimit the regions where this effect is observed, are called polar circles. The duration of this phenomenon depends on the latitude: from 66 ° 33 'to 70 ° the sun does not set for about 65 consecutive days, at 80 ° for about 130 days. Since the only inhabited areas south of the Antarctic Circle are scientific outposts, this experience is limited to the populations of theNorthern Europe, of the Russia, of the Canada, ofAlaska, of the Greenland andIceland.
In winter the opposite phenomenon occurs which is called polar night . However, there are some regions where you have the midnight sun but not the polar night: for it to be dark, the sun must be below the horizon, otherwise you can see the light of twilight. The polar night is not visible in Europe. The duration of the polar day, that is the period in which the Sun never sets, varies from 24 hours (during the summer solstice) at the polar circle, to 186 days at the poles.
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