Something similar to f57v.

[ololololo]

@ololololo

The original thing you posted is not a calendar per se, but a computus, for calculating the dates of liturgical feasts based on what year it is, based on the motions of the sun and the moon, taking into account things like leap years and moveable and immovable feasts. 

You can then make your own calendar for the year that shows the feast days (or sometimes even lucky days for travel, bloodletting, or eating goose, etc) once you are done your calculations with such a tool.

Thank you, Linda!
Such minimalist content (just letters) and yet such vast potential are truly impressive.
The same minimalism is observed in the f57v, and there may be some other divination procedure involved (judging by the ball in the hand of one of the people. Well, or not with fortune-telling, I do not know).