Many people have considered the rosettes image to represent a map. Some suggest that the entire collection of circles is a map, while others concentrate on one of the circles. Known propositions of this type are from Diane O'Donovan, Nick Pelling, Jürgen Wastl and D. Feger, J.K. Petersen and from Marco Ponzi, but there are many more similar suggestions that predate all of these.
There could be a tendency to believe, by the sheer number of these suggestions, that there is indeed most probably a map here, but I am of a rather different opinion. I do not believe it is a map. For me it is something more abstract.
D'Imperio already implied that it could be some kind of synthesis of the author's vision of the 'cosmos' and I find this idea attractive.
I always had the feeling that the circles in the rosettes diagram refer to the individual circles in the remainder of the 'cosmological' part of the MS. A complete one-to-one mapping has not yet been achieved but there are a number of clear parallels. I know others have had the same idea. I still think there is more to be said and discovered about this. Note that the set of cosmological drawings we have may not be complete.
But I also have a much more specific hypothesis. Of course I can't prove it, just like nobody can prove that the illustration is a map. If I could, I would not be writing it here, in this way.
Let me present the pros and cons of this hypothesis.
First of all, I believe that the central circle represents the sky. I already mentioned it before. The sky is like a plane or sheet with stars held up by six towers.
The upper right circle I believe represents the Earth. Most of the buildings are in or near this circle, and just outside it is a T-O map. There is more to be said, but let me keep it short.
That leaves 7 circles......
These 7 circles could represent the seven planets.
They could also be associated with the 7 week days and 7 metals.
(Nick Pelling suggests in his book - I believe - that the individual circles in the cosmological section might refer to the planets, so this is a close parallel, if the above-mentioned mapping between individual circles and the rosettes image is real).
Now if this is right, can we decide which circle is which planet / week day / metal? Let me add the mapping first. I also add the association with the humours, but I am not sure if these are uniquely identified.
Moon - Monday - Silver - Cold and moist
Sun - Sunday - Gold - Hot and dry
Mercury - Wednesday - Quicksilver - ?
Venus - Friday - Copper - Cold and moist
Mars - Tuesday - Iron - Hot and dry
Jupiter - Thursday - Tin - Hot and moist
Saturn - Saturday - Lead - Cold and dry
I know of one MS where the planets and weekdays are represented by circles (though much more simple ones), namely Augsburg MS Ludwig XII 8. It is available digitally ad You are not allowed to view links.
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Only if a convincing mapping between the 7 circles and the 7 planets / weekdays can be made, will this hypothesis gain considerable weight. How can we do that? It would be good to have more examples like MS Ludwig XII 8.
Furthermore, we still have three more small items in the corners of the rosettes diagram (beside the T-O map).
In the lower-left corner there is the symbol that has been compared to a clock. For me, this is a reference to f67v2.
It also looks like a symbol for a metal, possibly, but not necessarily Quicksilver or Mercury. This needs to be confirmed, of course, in particular if such symbols were already used in the early 15th Century.
Beside that we have two sun faces, and here we encounter our biggest problem. Had we had one sun and one moon, we would be 2 down, 5 to go, but we don't. There's a minor hope that one of the two could be a Moon after all, but a moon with rays like the sun is really very unusual.
Further help in assigning the 7 planets would be if they were ordered somehow according to their humours. The two sun faces could just both mean hot, and we have cold in the other two corners.
There is another important problem, of course.
In the illustration, all circles on the outside are connected to each other, and connected to the sky in the centre.
This implies that the Earth would have a similar 'role' as the other planets, which is quite an unusual concept for the 15th Century of course....
Plenty of work left before this hypothesis gains any weight.....