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As I said in another thread I may be a bit thick. All this astronomical data was known to the Egyptians and Babylonians after years of observations. Are you arguing in a circle here. The ancient monuments were built to these astro measurements so that they could observe and measure the movements of the heavens. Looking at the accepted beginings of stonehenge it began as a few single stones placed not by measurement but by observation. Much of the later additions had little to do with observing. Of course a standard measurement is needed but it won't be found looking at the stars. It will be found by statistical analysis of all measurements on the ground. If the whole of Wiltshire's monuments were built by the same people over several generations we should expect to find some correlation whether it's the height of a stone, the length of a lintel, or the distance to Avebury or Silbury Hill.
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