Catalan Zodiac Rose S.XV

[MarcoP]

What I don’t understand is why, if a lunar cycle lasts 29 days, they used only 19 tables.

They follow the You are not allowed to view links. Register or Login to view.: a period of almost exactly 19 years after which the lunar phases recur at the same time of the year.

That makes sense. So the system could be purely astrological rather than pseudo-astrological. Counting on the 19 locations on the hand could then be an analogue system to get year-number-mod(19) and select the right table for the current year.