Game of Thrones: There's a Scientific Reason for Westeros's Years-Long
Or at least, there are climate scientists happily overthinking this fantasy world.
What happened to winter in Game of Thrones?
Where does the concept of 'year' come from in Game of Thrones/aSoIaF if seasons themselves can last for years (at the beginning of GoT summer has lasted for a decade)? - Quora
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Game of Thrones: There's a Scientific Reason for Westeros's Years-Long
Game of Thrones: Scientists use model to explain Westeros's strange climate and extended seasons, The Independent
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How do people in Game of Thrones measure years if winter comes every few years and lasts for a few years? - Quora
Why do the Westerosi measure a season in years, instead of the other way around? - Quora