Easter in Aries and Taurus?

[Koen G]

The month names were almost certainly added later, so ignoring them is a valid approach. The nymphs could still be days if for some reason, someone decided to divide them like this. They could also be degrees of the Zodiac, or something else altogether, or a combination of things.

Anyway, the best advice I can give you (or anyone looking at Voynich images) is that when you find something that doesn't quite work, just state that it doesn't. I know from experience that this is much better, both for the researcher and the audience, as compared to trying to force everything by inventing narratives.

For example: 

• "Following this reasoning, we would expect this nymph to be on position x, but instead it is on position x+5"
  

Is better than:

• "Apparently the Voynich Author celebrated Easter on September 1st. According to [bad source], the Cathars celebrated Easter in August. Hence, the Voynich was written by Cathars".
  

That's an extreme example, but it happens. It's much more useful to state deviations as what they are.