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I am looking for a science fiction book, where seasons last for tens or hundred of years. The whole work is split in several volumes or books. The action starts in the winter. With the coming of summer the inhabitants of the planet are affected by some kind of plague that makes them very fat or very skinny (don't remember exactly). Technology level is close to middle age Earth. High in the sky a communication satellite from another civilization registers the events on the planet below and streams it back home, as some kind of reality show at planetary scale (all unknown to the people below).
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