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Is this the same Neugebauer who looked into Roman catapults as well?
With respect to the astronomical calendar's I've some reading of the articles by Thom etc - but getting a hold of original survey data (for accuracy) is not easy. The main reason I'm going over it now is to see what changes have been made during the past 20+ years and trying to get my own head around it to understand how it was put to use.
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