Most sundial used in the garden are used as decorative art more so then a accurate time telling instrument however many sundials have adjustments and instructions to aid them as a time telling device.
In general, sundials indicate the time by casting a shadow or throwing light onto a surface known as a dial face or dial plate. Although usually a flat plane, the dial face may also be the inner or outer surface of a sphere, cylinder, cone, helix, and various other shapes.
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