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50 sats \ 1 reply \ @StillStackinAfterAllTheseYears OP 9 Apr \ parent \ on: "Nightfall," by Isaac Asimov BooksAndArticles
There's both the original short story (which I'm sure your dad has in a collection) and also an expanded novel that Robert Silverberg (another great of the era) co-wrote with Asimov twenty years later. I like them both, but if you've got a preference for one format over the other, that might be something to consider.