An astronomical chart is a visual representation of the night sky, showing the positions of stars, planets, and other celestial objects. These charts help astronomers and stargazers identify constellations and navigate the heavens. They can vary in detail, from simple star maps to complex diagrams that include information about celestial events. Astronomical charts are often used in conjunction with tools like telescopes and binoculars. They can be printed or digital, and many are designed for specific locations and times, making them useful for both amateur and professional astronomers. Popular examples include the works of Ptolemy and modern software applications.