http://www.webcams.travel/webcam/ful...h-Pole-Station

Orbital dawn is somewhat a ways off as the planet moves through space and has yet to turn the South pole latitudes through the circle of illumination around the September Equinox, the only time that location will pass through the circle of illumination whereas at lower latitudes locations pass through the circle of illumination into dawn each 24 hour hours.

The partitioning of dual day/night cycles by way of dynamics is for the ordinary observer who is capable of discerning how a planet turns in two distinct ways to the central Sun and as a point of departure for researching multiple things like why the noon cycles vary from 24 hours, what causes the seasons, how the orbital surface rotation is responsible for sea ice evolution and many more issues that have yet to appear.

The less capable trundle out the 'tilt' explanation around the Equinoxes and Solstices as though the Earth tilted towards and award from the Sun as an action but the breakthrough is accounting for the polar day/night and the daily daylight/darkness cycle using separate rotations. Welcome to the 21st century for those who can make it.