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Although known as the astronomical ring, it is principally employed as an ecuatorial solar universal quadrant. Its use was widespread during 18th century.
It is composed of a ring that can be adjusted to various latitudes, a meridian ring showing the latitude scale, a moveable hour ring and a central, grooved bar that is graduated for the months of the year and a perforated cylinder, which moves over this. It will indicate the solar local time.
Max height (with stand): 12cm / Diameter: 10cm / Thickness: 0,4cm
Max height (with stand): 4.7 inches /Diameter: 3.94 inches / Thickness: 0.11 inches