  We investigate the imaginary world of Kalgash, a planetary system based on
the novel "Nightfall" (Asimov & Silverberg, 1991). The system consists of a
planet, a moon and an astonishing six suns. The six stars cause the wider
universe to be invisible to the inhabitants of the planet. The author explores
the consequences of an eclipse and the resulting darkness which the Kalgash
people experience for the first time. Our task is to verify if this system is
feasible, from the duration of the eclipse, the "invisibility" of the universe
to the complex orbital dynamics.
