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Originally Posted by polak
Thats what I heard too but don't we still have very little knowledge about the actual shape of our galaxy in terms of thickness and what not?
I guess the aliens might have told them
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Well they might not have known what we know about the galaxy and such like that, they could just be noticing the pattern of the stars changing over years and years and noticing a cycle. We already know that's where stuff like the zodiac comes from and other ways ancient cultures measured time fairly accurately.
Though I'm not sure how they'd know about a 4500 year old cycle (if it's even true) I don't think their civilization lasted that long. Even if it was long term knowledge passed down from generation to generation, that's a heck of a long time to figure out one cycle.