object
Volvelle
A named rotating paper or parchment dial bound in a book for calendar or sky calculation. Not a published planisphere alone, not an equatorium, and not a bare wheel dump.
Also known as Volvelle dial · Rotating calendar dial
object
A named rotating paper or parchment dial bound in a book for calendar or sky calculation. Not a published planisphere alone, not an equatorium, and not a bare wheel dump.
Also known as Volvelle dial · Rotating calendar dial