Epact: Astronomical Ring Dial signed by Gualterus Arsenius, dated 1572
Universal equinoctial ring sundial, astronomical ring dial | Science Museum Group Collection
AN ASTRONOMICAL RING DIAL
Mid 18th Century Brass Astronomical ring dial. - Gilai Collectibles
16th Century German Astronomical Ring | A Token of Love – Gifts for Designers
Equinoctial Ring Sundial by Henry Sutton | National Museum of American History
Astronomical rings - Wikiwand
A rare Ottoman brass equinoctial ring dial, signed by Mahmud Bey al-Falaki, Egypt, dated 1291 AH/1874 AD | Arts of the Islamic World & India including Fine Rugs and Carpets | 2021 | Sotheby's
Epact: Astronomical Ring Dial signed by Johannes Motter, mid 16th century