I am open also to the possibility that the 11-fold multi-layer lunar roundel could possibly be of European origin.
This could be an example of lost knowledge, a depiction of a fully functional and quite unconventional pocket volvelle based on the 11-day lunar-solar discrepancy that drives the entire 19-year Metonic cycle, the Golden Number, and the Epact (the foundation of the medieval computus).
This could be an example of lost knowledge, a depiction of a fully functional and quite unconventional pocket volvelle based on the 11-day lunar-solar discrepancy that drives the entire 19-year Metonic cycle, the Golden Number, and the Epact (the foundation of the medieval computus).