"[Volvelle]", Galluci, Giovanni Paolo
Subject: Cartographic Miscellany
Period: 1657 (published)
Publication: Theatro del Mundo ye del tiempo Granada
Color: Black & White
7 x 10 inches
17.8 x 25.4 cm
Fully functional volvelle, which was used for finding the position of the moon in the zodiac, given the position of the sun and the age of the moon. There is an engraved circle with 31 divisions, into which a separate piece of paper is attached with the original red satin ribbon. This inner piece, onto which the months are engraved, rotates around the circle.