This Planisphere shows the star constellations visible in the Northern Hemisphere sky at any given time.
Simply rotate the movable disk until the day of the month corresponds with the time of day or night. Hold the Planisphere above you and orient it to match the Eastern and Western horizons. The window will then show which constellations are present in the sky.
This planisphere is around 20 cm, features beautiful gold foiling and has been printed on high quality paper with a soft touch lamination overlay to protect it.