Midnight sun, also known as polar day, is a natural phenomenon that occurs in the summer months in places north of the Arctic Circle or south of the Antarctic Circle, when the Sun remains visible at the local midnight. When midnight sun is seen in the Arctic, the Sun appears to move from left to right. In Antarctica, the equivalent apparent motion is from right to left. This occurs at latitudes ranging from approximately 65°44' to exactly 90° north or south, and does not stop exactly at the Arctic Circle or the Antarctic Circle, due to refraction.
Midnight sun at the North Cape on the island of Magerøya in Norway
Multiple exposure of midnight sun on Lake Ozhogino in Yakutia, Russia
Embankment of the Neva river in Saint Petersburg, 23:30 local time.
Summer night in the city of Pori on July 2, 2010
The Arctic Circle is one of the two polar circles, and the most northerly of the five major circles of latitude as shown on maps of Earth at about 66° 34' N. Its southern equivalent is the Antarctic Circle.
At night, bright aurora borealis are a fairly common sight in the Arctic Circle. The picture of the northern lights in Rovaniemi.
Polcirkeln portal in Gällivare, Sweden
Arctic Circle line in Rovaniemi, Finland c. 1865
Arctic Circle monument in Salekhard, Russia
