Why the rosettes image may not be a map at all

[Oocephalus]

Anton:

I wander what's the origin of number 37 in the indians' calendar, to begin with. Why 37, but not 35 or 43?

I guess it just originated as a cycle of three solar years. A suna (30 days) appears to be an approximation to the lunar cycle, just as our months. Note that according to Humboldt the Muisca also had a "week" of three days, so the idea of cycles of threes may have been there. 
Also good observation on the similarities to other folios. It seems indeed that the upper left rosette has to do with the moon. Which would mean that my own idea is probably wrong, as I thought the upper right one was connected to the moon.