Rather than have a nuisance exploit a typo,I have to repeat the statement correctly -
The insight where the polar coordinates pass through the circle of illumination can be distinctly extracted from the orbital behavior of the Earth 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
For a world that spends many,many billions each year on 'climate science' and refuses to pay attention to the orbital day/night cycle as each and every location on the planet has their moment as a location turns into and out of the circle of illumination as a consequence of the orbital behavior of the Earth,in two weeks time it will be the turn of the North/South poles.