Helliconia Spring
BSFA and Campbell Memorial Award winner; the trilogy stands as British SF's grandest worldbuilding project and a clear influence on later planetary epics from Robinson's Mars onward.
Series Guide
Helliconia
by Brian Aldiss
Aldiss's trilogy chronicling a world whose Great Year — two and a half millennia orbiting a binary star — drags civilisations through spring flowering, summer empire and winter extinction, while humans watch from orbit.