A sundial is a simple device used to tell time by using the position of the sun. It consists of a flat plate, called the dial, and a stick or gnomon that stands upright in the center. As the sun moves across the sky, the shadow cast by the gnomon moves around the dial, indicating the time of day based on the angle of the sun. Sundials have been used for thousands of years, dating back to ancient civilizations like the Egyptians and Greeks. They are often found in gardens and parks as decorative pieces, showcasing both art and science. While they are not as accurate as modern clocks, sundials provide a unique way to connect with nature and the passage of time.