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[HermesRevived]

It is an astronomical-astrological notation, Antonio, but the task of determining how it works remains. I've been consulting some relevant people in the field of Hellenistic and Traditional Astrology - which is experiencing a revival in astrological circles. They report that, unfortunately, there is no comprehensive study of pre-Renaissance astrological notation, and most studies concentrate on Hellenist texts from late Antiquity. There is some good work being done, such this article by Deborah Houlding:

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Texts and charts and the diversity of astrological practice prior to the standardization of the Renaissance is still relatively unstudied. I also suspect that the notation in the Voynich is an eccentric hybrid of Latin and Greek conventions making it all the more difficult. I am hoping, though, that the Voynich system has a model in some other work. You have pointed to the Ashmole ms. That is a good place to start. Onwards.