EXCLUSIVE! Use an ancient tool to measure time as the ancients did, using the sun and math to identify hours and minutes, simply by holding it in the right position and observing the cast shadow. This sundial is based on a historical original that is kept at the Royal Observatory in Greenwich, England. Comes boxed with instructions. Solid brass and steel, crafted in Austria. 2 3/8" x 2¾". Ages 15+.