18" Planisphere contains all 110 Messier Objects plus dozens of additional deep sky treasures. Perfect for budding astronomers who want to learn the night sky, as well as for seasoned observers who are working on the Astronomical League's Messier program, or those participating in a Messier Marathon! All astronomers will love the easy to use format, the quick reference on the back, and the locator charts for difficult objects. The large star chart is easy to see, even with dark adapted vision. Colors are optimized for viewing under red light.