The midnight sun phenomenon, where the Sun does not set for 24 hours or more, occurs only in the polar regions. This phenomenon can be explained with the help of the axial tilt of the Earth. The Earth is tilted at an angle when it revolves around the Sun, which is known as axial tilt. This tilt is 23 degrees 26 minutes or approximately, 23.5 degrees. In other words, the Earth's rotational axis is tilted at an angle of 23.5 degrees with respect to a line perpendicular to the ecliptic. Ecliptic is the orbital plane, or the plane on which the Earth orbits the Sun.