Why the Voynich Zodiac - isn't

[bi3mw]

The beginning of the charts with the zodiac sign of Pisces, I think, is due to the fact that the beginning of the garden year in Catholic countries was on March 17. This is the day of St. Gertrude, the patron saint of gardeners and farmers. On this day all the fields were blessed and work began in the fields and gardens. March 17 belongs to the zodiac sign Pisces.

This is an interesting theesis. However, the rosettes and the recipe section suggest that it is thematically about other areas as well. I would rather assume that the VMS is an anthology and not a monothematic work.