Crossbowman

[ReneZ]

but let's suppose that the man is a German sagittarius indeed (insofar as the term "German" can be used applied to 15th century). What next? How does that advance us in decrypting the Voynichese?

Hello Anton, this is indeed one of many things that may not help directly in the understanding of the text.
The aim is more to pinpoint more precisely the place and time where the MS was created.
These are questions of interest by themselves, but, when answered they might also narrow down the
options for the meaning of the text.