I have read a short story about a world with like 9 suns and 3 moons. It’s day all the time, except once every 2000 years, when there is a total solar eclipse. So every 2000 years society falls into chaos, most of the population kills themselves and only rich people, who can afford enough candles/fire or people who are passed out drunk survive the eclipse. At the time the story takes place one astronomer/scientist notices the pattern in their history and like predicts it or something.
Sadly I do not know the link. If anyone recognizes the story I would love to read it again.