Let's imagine for a moment that the Voynich only had the astronomical and cosmological pages. It would still be a book with an uncertain message, given that some of its images are rarely seen in other medieval codices on similar topics. The script for that reduced VM would be the same indecipherable script that we see.
If I were to say that the glyphs in that script are astronomical symbols, I'm sure my theory would be more credible since it would be consistent with the imagery. It would seem logical that astronomical and cosmological illustrations would be accompanied by those symbols.
The strange combinations of glyphs we see in You are not allowed to view links.
Register or
Login to view. would make sense then; we see single glyphs in one circle, only groups in another, and in another circle, single and groups mixed together. All of this leads one to think of astronomical symbols and their combinations on a cosmological page. The star-filled folios f68r1/r2 would also make sense. It would be easier to see the labels as groups of symbols marking the star's position rather than names.
Seeing that script accompanying the dozens of herbs in the Voynich makes one think of a text from a language, but in the medieval mindset that permeates this book, the stars are what create the herbs, and so it makes sense that they share the same symbols.