Universal equinoctial ring sundial, astronomical ring dial | Science Museum Group Collection
Astronomical Ring of an unusual type, showing the side of the instrument "Butterfield Paris". Undated, circa 1690. This instrument is closer to an equinoctial ring dial than most astronomical rings. | Wellcome Collection
Astronomical rings - Wikipedia
Mid 18th Century Brass Astronomical ring dial. - Gilai Collectibles
Miniature Astronomical Ring Dial - Hemisferium | Boutiques de Musées
Universal equinoctial ring sundial, astronomical four ring dial | Science Museum Group Collection
astronomical dial; ring-dial; sundial | British Museum
Epact: Astronomical Ring Dial signed by Johannes Motter, mid 16th century
Astronomical ring dial from hemisferium ICA. Adjustable for latitude and time of year till time like it's 1565 and find your way to something different | Utiles
16th Century German Astronomical Ring | A Token of Love – Gifts for Designers
Astronomical rings - Wikipedia
Sundial style #7 with Lab Diamonds | John David Cooney
16th Century German Astronomical Ring | A Token of Love – Gifts for Designers