f67v2 is a bit like the Rosettes foldout but without the rosettes.

[MarcoP]

Two suns might represent the rising and setting suns.

That certainly is a possibility. I am sure we discussed examples in the past. This diagram with rising and setting suns is from Liber Floridus. In the case of the Voynich diagrams, it's not clear what the T-O maps stand for, if the two suns stand for East and West. T-O maps typically represent Terra, but the Earth is expected to be at the center of the cosmos, not in a specific cardinal direction.

   

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You are not allowed to view links. Register or Login to view. is an example of a manuscript that includes two similar diagrams representing the seasons, the elements and the Galenic properties. The first one (Byrhtferth’s diagram) is larger and more complex than the second one.
   

It’s certainly possible that there is a considerable overlap in the contents of the two Voynich diagrams. In Koen’s analysis, there's a striking amount of dynamic information, with fluxes going both from the center to the outside and from the outside to the center. Most medieval diagrams are quite static (like the two from MS 17), or feature a single radial direction (e.g. winds blowing from the outside circle towards the earth at the center of the diagram). The Liber Floridus diagram also shows flows (tides, maybe?).