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--- Begin Message ---While calendars are a current topic, please can anyone direct me to detailed information about the Perpetual Calendar created by Giovanni Antonio Amedeo Plana, located in Turin. I have discovered a paper: IMEKO-TC4-ARCHAEO-2017-008.pdf but it has few details. Apparently the University of Turin team built both a physical replica and a digital version, I have not found any references to these. Graham Stapleton
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