Astronomical Ring Dial - Hemisferium
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): 4.7 inches /Diam.: 3.94 inches / Thickness: 0.11 inches