Midnight Sun at North Cape, Norway.
The September equinox means sunrise at the South Pole and sunset at the North Pole. The sun will not set again at the South Pole until the March equinox. Midnight sun is when at least a part of the Sun’s disk is visible above the horizon 24 hours of the day. The scientific name for midnight Sun is polar day and the opposite is polar night. As the upper edge of the solar disc disappears below the horizon, the Sun has set, and there is no longer midnight Sun.