What is the Midnight Sun?

The Midnight Sun is a natural phenomenon that occurs north of the Arctic Circle and south of the Antarctic Circle. Since the axial tilt of Earth is considerable, the sun doesn't set during a period of time at these areas. That means that during a specific period of time (how long depends on how close you're to the pole) the sun doesn't set, resulting in 24 hours of daylight. In some areas, this is referred to as the Polar Day.