It is utterly and totally unacceptable that the orbital day/night cycle is ignored insofar as it is the turn of the Northern/Southern polar latitudes to turn through the circle of illumination into their respective orbital dawn and twilight.

http://www.esrl.noaa.gov/gmd/webdata...dlfullsize.jpg

It will still be dawn in 2 hours,12 hours or 12 days until until the central Sun appears as the polar coordinates are carried around in a circle just as all polar coordinates are -

http://www.daviddarling.info/images/...gs_changes.jpg

The next person who explains why the South Pole station has moved out of darkness will also be explaining where the Equation of Time comes from along with the seasons at lower latitudes.

I do not care how many mathematical nuisances show up to smother this insight nor how desperate the constellation spotters are to retain their idea of what astronomy is,anyone can explain this right here and right now without the slightest objection from me.

Inspiration does not equate to guessing the future and the spirit to interpret the celestial motions and apply their effects in terrestrial science is open to all with the same adventurous spirit -

"Have you tied cords to the Pleiades,or loosened the bonds of Orion?Can you bring forth the Mazzaroth in their season,or guide the Bear with her children? Do you know the ordinances of the heavens;can you set their effects on the earth?" Book of Job

Enough of the anti-astronomical,anti-faith crowd,the insight where the polar coordinates pass through the circle of illumination can be distinctly extracted from the orbital behavior of the Sun by adapting the animated graphic to reflect the orbital behavior of the moon around the Earth on the left side of the graphic while the orbital behavior of the Earth is reflected on the graphic to the right side -

http://upload.wikimedia.org/wikipedi..._the_Earth.gif