Planisphere for the Northern Hemisphere
This planisphere, made of coated paper, is designed to be used between latitudes 30° and 70° in the northern hemisphere. Therefore, it covers all European Union member states and all other countries between these latitudes (such as the USA, Canada, Russia and most of China). It has four masks to adjust to different latitudes. They are designed for 35, 45, 55 and 65 degrees and can be used with a high degree of accuracy five degrees above and below the designed value.