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The megalithic epoch 5000-2500 BC expressed of a numeracy different to ours.
The geocentric astronomical periods were counted and found numerically meaningful using the tools of a pre-arithmetic numeracy [metrology + geometry]. From this much of our symbolism concerning "the gods" and our system of measures came to be based.
From the point of view of evidence, this astronomical work appears to have started in Carnac, Brittany, by 5000-4700 BC. It is largely monument based but some art has survived, the finest in Gavrinis, a south of Brittany chambered tomb. We note some of the many books on the megalith builders and people who wrote them or books on number sciences in general.
One major observation is of the continuity between the megalithic period (the terminal stone age) and later civilisations which can be traced through number sciences, then expressed through monuments, art/iconography and written records, especially myths written down from the oral traditions.
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