sundial

A sundial is a device that tells the time by the position of the sun. It is a simple and ancient way to tell time, and it is still used today in some places.

A sundial has a flat surface with a gnomon, which is a stick or rod that casts a shadow. The shadow moves across the surface of the sundial as the sun moves across the sky. The position of the shadow tells the time of day.

Sundials can be made of different materials, such as stone, metal, or wood. They can be very simple or very complex.

Sundials are a fun and educational way to learn about the sun and time. They can also be used to tell the time in places where there is no electricity.

The sundial was a popular way to tell the time before clocks and watches were invented.