Planisphere

A planisphere is a simple, rotating star chart that helps users identify stars and constellations visible in the night sky at any given time and location. It consists of a circular disk with a skyline cutout, overlaid with a map of the stars. By aligning the date and time, you can see which celestial objects are above the horizon. Planispheres are useful tools for amateur astronomers and anyone interested in stargazing, providing a practical way to navigate the night sky and learn about constellations.