The Voynich Pipes

[Koen G]

Thanks, Rene, very clear article. So basically you imagine a line from Polaris through B Cassiopeia, read it like the arm on a 24-hour clock and then adjust 4 minutes for every day passed since March 21.

But then why did they need a big tube?

I can see how the VM diagrams could be something similar, where the star in the middle for example indicates the celestial pole or a standard reference star.