Why the Poles Have Six Months of Daylight and Darkness

Earth's 23.5° axial tilt causes polar day/night cycles. As Earth orbits the Sun:

• North Pole tilts toward Sun → 6 months daylight (South Pole: darkness).
• Six months later, reversed: South Pole tilts toward Sun → daylight; North Pole → darkness.

The tilt creates extreme seasonal photoperiods at the poles.