Planetarium projector. Skymaster ZKP3 projector for projecting an optical image of the night sky onto the domed ceilings of a planetarium. It accurately reproduces the location of the stars in the night sky and other astronomical features such as the the Milky Way, star clusters, nebulae and galaxies. This projector manufactured by Carl Zeiss is among the most compact available, therefore it can be used in small planetariums and does not restrict the audience's view. In the background star systems are seen.