Asimov and Silverberg confused me for a moment - Nightfall was an Asimov-only short story from 1941. Still think it's one of his best. TIL there was a collaborative novel as well, which carried on after the events of the short story.
* * *
If you like novels that explore civilisations that have long astronomical cycles, the other classic is the Helliconia trilogy by Brian Aldiss. It's set in a double star system where the main planetary orbit takes 2500 Earth years, and the seasons last for Earth centuries. Civilisation tends to collapse when winter comes, but gradually approaches semi-industrial levels of technology by autumn.