The Helliconia trilogy is a series of science fiction books by British writer Brian W. Aldiss, set on the Earth-like planet Helliconia. It is an epic chronicling the rise and fall of a civilisation over thousands of years as the planet progresses through its incredibly long seasons, which last for centuries. The trilogy consists of the books Helliconia Spring (published in 1982), Helliconia Summer (1983), and Helliconia Winter (1985). Source: Wikipedia (en)