Nightfall
Author: Isaac Asimov & Robert Silverberg
 
For the people of Kalgash, complete darkness is a terrifying and impossible unknown: their six suns constantly illuminate all corners of the known world.
But new and shattering ideas have come to light. And pioneering scientists, archeologists and religious extremists unite to predict the coming of a bimilleniary eclipse . . .
 
PAN BOOKS 1991
ISBN: 9780330320962