On the other hand, ancient unknown humans, maybe greek, had the skills to build this: The Antikythera Mechanism - 2D
now there are some conclusions possible:
- There are more than 1500 years between the first kown pocket watch in europe, the clock-watch and the ancient Antikythera ecliptic calculator. We can see, both are build on the same technology, so there must be a connection over the time, but we don't have any brass artefact to proof this.
- There is a very big miscalculation bug in our known historical timeframe.
- Or human beings have recurrent and natural and enormous cultural defeats in historically very short periods of time. And now we are on the start from this blog, it is too late?
- This hypothesis given as german video https://youtu.be/2baZMWaiMxs about the question, our universe can be a black hole? If so it's not too late!