 What is the meaning of Dondromogon’s two extreme hemispheres?
It is as well, for this will be a birth and beginning of your destined leadership on Dondromogon." But because Dondromogon wavers on its axis, there are two lunes of its surface which from time to time shift from night to day. From pole to pole on opposite sides ran the two twilight zones, widest at the equators like the outer rind of two slices of melon. Of course, such areas, between the hot and cold hemispheres, would be buffeted by mighty gales ... the voice was to be heard again: "War is fought between the two strips of habitable ground. Dondromogon was found and settled long ago, by adventurers from afar. "On this world of yours—Dondromogon, isn't it called?—I'm no more than an hour old.
 It causes its inhabitant groups to fight over what amount of the planet is habitable, the two extremes symbolizing the split between peoples.
 It causes its people to develop two vastly different cultures, creating social tension.  It causes its people to search for prophets, martyrs, and heroes, symbolizing the schizophrenia of the planet’s inhabitants.  It causes its people to live underground, giving the story its setting.  It causes its inhabitant groups to fight over what amount of the planet is habitable, the two extremes symbolizing the split between peoples.