Rosettes as a ... magic altar

[Rafal]

And let me show more possibly related things.

The related thing to almadel is magic circle which was also used to contact the spirits. They are usually quite symmetrical, just like the Rosettes
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I also see some similarities to this well known form of horoscope
   

I put Rosettes image over such horoscope and that's what you get:
   

Quite fitting, isn't it?   It requires some comment however.

In such horoscopes corners and vertices aren't important. The triangles are important. There are 12 triangles which represent 12 astrological houses/mansions (domus in Latin, Haus in German):
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They have probably different interpretations in different works but they are generally responsible for different areas of your life. Wikipedia mentions stuff like Home and Family, Pleasure, Health, Balance or Transformation etc.

Voynich Rosettes don't have triangles so maybe the Rosettes themselves work something like astrological houses???

Notice that we have several Suns in Rosettes which is similar to these horoscopes as they contain a lot of planet and Zodiac signs symbols.