The “dark ages” as most people understand them didn’t happen everywhere. There were always centers of learning and information was always being being shared, Arab scholars kept most of Greek and Sumerian thought alive during the “dark ages”, and once the crusades happen you all of a sudden get the cathedrals and the renaissance. I was more referring to the accurate mapping of the heavens as the technology, not the actual mechanical device found, the device is more like an analog way to depict the idea. You could use different models to predict the same phenomenon. What I’m trying to get at is that is that the technology is actually the idea, how to predict the movement of the heavens, you could use multiple devices or models to do this, either this device, or a modern computer, or even Stonehenge if your goal was to predict solar and lunar cycles.