The Helliconia Trilogy

From a Science Fiction Grand Master: The sweeping epic of a planet veering from one extreme atmosphere to another—and the humans trying to survive on it.   Helliconia Spring introduces us to a tumultuous world that follows an eccentric orbit around a double-star system—and the satellite from Earth secretly monitoring it. Hugo and Nebula Award–winning author Brian W. Aldiss then explores the social and religious divisions keeping the planet’s population in conflict even as they’re devastated