Both dials use the shape of a concave hemisphere, a shape like the inside of a bowl that mimics, in reverse, the apparent dome shape of the sky. As the sun moved across the sky above, the shadow of ...

Our sundial consists of an engraved, concave hemisphere carved into poured concrete, at the center of which is a vertical pin to cast the shadow. To build this sundial we needed to first make a mold ...

In the Northern Hemisphere, as the sun moves across the sky from east to west, the shadow on a sundial moves in a circular path from left to right. This natural movement of shadows was well-known ...