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They made star maps. They mapped the posiitons of stars on the imaginary celestial sphere - whch they thought was an actual physical hollow sphere surrounding the Earth at some distance. Because the earth rotates, and they thought that the Earth stood still, they believed that the imaginary celestial sphere rotated around the Earth. They saw that stars ...


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Only since February 2018 there is a Wikipedia Page about the Great Year which is indeed a good read, but I think the German wiki version has a more concise summary, here an (approximate) translation with my highlighting: A great year or platonic year is the time during which the vernal equinox moves once through the zodiac. The designation of this cycle of ...


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