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I have been under the impression that carbon dating gives a window of 50 years or more. If this does apply then the traverse of the Pleiades across the western end of Gray hill with its window of less than 30 years is evidently a more accurate methodology in this specific case. If carbon is today refined to a greater accuracy than 30 years then I am wrong. In any case the comment was merely to emphasise the fact that dating can be quite accurately derived from the movements of the heavens. Regarding positioning, a fixed observation location and a fixed object with a light in the sky traversing the horizon in its rise and set positions over a period certainly gives date and time., or at least the computer simulating it gives me the date and time. This is because the observation location and fixed objects are just that-fixed. They are two hills in this case one observed from the other. My methodology is as reliable as the computer programs I use. Harry
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