Sundial - Astronomical Rings H21 Universal Sundial - for determining all latitudes. The universal equatorial solar quadrant. One of the most universal sundials in the 17th and 18th centuries. Rich ornaments. Made of zamak and brass, lacquered according to the technology of the past centuries. Wooden stand. It was an alloy of zinc with aluminum or with aluminum and copper. Also used as additives are manganese, magnesium and titanium. Max. height with a stand 12cm; Wed 10 cm thick: 0.4 cm weight: 175 gr The instrument consists of: - a throne - a movable sling enabling to determine the latitude. The throne can be moved to set the correct latitude. - meridian - stationary ring with a latitude scale - movable "equatorial" ring with hourly scale - sliding declination scale for determining months (in the center of the device) - acting like a gnomon. Each month was divided into three periods of 10 days. The month names are symbolized by letters, eg O - October. In the center there is a tiny, movable element that allows you to set the correct month and date. In order to read the time, the equatorial ring should be unfolded so that it lies in a plane perpendicular to the meridian. Then you need to determine the latitude using the throne. Set the correct date on the declination scale. You should suspend the device using the throne after setting the real latitude where we are. The sun's rays will show the correct solar hour. Please note that the official time may differ from the solar time. A great gift for a sailor, engineer, astronomy lover. User manual in English, French, Italian and Spanish. A product of the Spanish company Hemisferium. The set includes an attractive decorative box with an insert on which the device rests.