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I am new to this topic but tend to believe evidence is accumulating that northern european navigators and land-surveyers were far more adept than previously thought. Little doubt exists anymore that their astronomical knowledge was superior both to that of the Hellenistic Age and medieval period. No need exists for mystical explanations - they had the need, as agricultural and hunting-gardening societies their priesthood had the time, and as societies they had the time for accurate observations over thousands of years. As an analogy, modern carbon dating indicates the cave-painting cultures were doing these paintings consistently over a 35,000 year period. It6's not hard to imagine the Neolithic Age millenia later also developed a consistent culture over time. One could argue that with fits and starts the scientific age goes back to Thales and other Ionians, 2800 years ago, and that it will continue until catastrophe overtakes us.
Something is not right. This message is just to keep things from messing up down the road