Astronomical clocks are intricate timekeeping devices that display not only the time but also various astronomical information. They often show the positions of celestial bodies, such as the Sun and Moon, and can indicate phases of the Moon and the zodiac signs. These clocks combine artistry and science, often featuring elaborate designs and mechanisms. Historically, astronomical clocks were used in medieval Europe to help people understand the movements of the heavens. They served both practical purposes, like telling time, and educational roles, teaching about astronomy. Famous examples include the Prague Astronomical Clock and the Strasbourg Astronomical Clock.