Although a century later than the Voynich, it is still curious that some astronomical tables use a similar glyph such as the slash. These are the Prussian tables of Erasmus Reinhold, which replaced the Alfonsine tables.

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Here you can see a page from an edition of the Prussian tables with the slash to indicate parts of the circle of the elliptic. Interestingly, the slash is also repeated like the Voynich glyph.

On this page of the Prussian tables, the use of the slash to indicate parts of the ecliptic is more clearly seen.

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The interesting thing, as with the similar VM glyph, is the fact that the line is inclined and not vertical. Obviously, what is intended to be represented is a portion in a circle, hence the tilt.

This is a 16th century astronomical book, but there are many medieval Volvelles with the same slash marking the degrees of the sphere.

   

I'm not sure what you mean. I think you mean the one underlined in red.
By the way in blue. You can see the ending ‘um’ sometimes also ‘tum’. In terms of frequency, you can equate it with EVA ‘y’ (9). Which you can also prove.
9 = um or us.
That already contradicts your theory.
Follow the breadcrumbs, or the red thread.

I'm sorry you don't understand what I mean. I don't think it's that complicated. The slash in an astronomical symbol. That's all.

In response again to Aga:

My theory has nothing to do with Latin or any other language. I know very well that the endings um and us were abbreviated in Latin with a character similar to EVA-y (9). That does not mean that the glyph we see in the Voynich is a Latin abbreviation.That is precisely the trap that many solvers fall into.

I don't understand the fascination with Latin among people whose mother tongue isn't derived from Latin. My Spanish language is derived from Latin, a language I had to study as a child like everyone else of my generation. We hated Latin.

"That does not mean that the glyph we see in the Voynich is a Latin abbreviation."
But it also means that the possibility exists.
But if you look closely, the manuscript explains that this is the case.

I understand that you reject it in principle. It would also undermine your theory.
My answer to your trap.

Okay, let's leave this dialogue of the deaf.

The truth is that people never tire of looking for linguistic solutions to the Voynich script. It seems very reasonable because everything has the appearance of a text and a sequence of words. But despite so many efforts over so many years not a hint of language has appeared.

Are there other possibilities? I think so, because graphic signs, symbols, or icons have always been a means of communication for humans. In VM script, we frequently see this glyph [c]. We see it repeated two, three, even four times; we also see it forming a sort of [s] and combined in what we call benches. Since ancient times, this sign [c] has been the symbol of the moon. Why can't it also be the symbol in the Voynich, if we see the moon drawn repeatedly in the manuscript?

If the linguistic prejudice were not so great, I think that certain features that do not fit with phonetics could be clearly seen. It has already been said that the most common glyphs do not seem sufficient to support the sounds of a language, but the problem is even greater. There are approximately 100 rare glyphs in the Voynich that don't form the main body of the script. What do we do with them?

In an iconic system like the one I propose, these unusual glyphs could fit. In my theory of VM, the most common glyphs represent celestial objects moving along the ecliptic. The so-called words would be nothing more than the positions of these objects. The rare glyphs could be images of the movement of the stars or astrological features that are not relevant to constructing the system.

This all sounds strange, but it's best understood with an example. I believe benched gallows are a representation of the moon beneath the sun at the same degree, i.e., the new moon. There is a rare glyph that fits another [c] into the space below, which may represent the transit of the moon.