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The phenomenon occurs near the terrestrial poles, during the summer, when the Sun can be seen 24 hours a day. This happens because the inclination of the Earth’s axis in relation to the plane of its orbit causes sunlight to fall almost perpendicularly on the poles, during six months of each year. Between October and March, the Midnight Sun occurs at the South Pole; from April to September, at the North Pole – it can be seen, therefore, in the countries of the Scandinavian Peninsula (Norway, Sweden, Finland and Denmark), in addition to the north of Canada and Russia, in December; and in Antarctica in July. At the poles proper, both the solar day and night last a whole semester.
During the summer, it never gets completely dark on the coast of Norway
Every six months, the Earth’s axis relative to the Sun tilts one way and then the other. This means that, at the poles, during each summer, the night practically ceases to exist.