![]() A number of aspherical condenser lenses were placed within each globe to focus the light onto the plates. Each globe was illuminated using a 1,500-watt lamp that was located in its center. Two glass plates held this foil between them to create what was called a "star field plate". The "stars" were created by tiny holes that were punched into copper foil, ranging from 0.023 to 0.452 mm in size, the larger holes letting more light get through and thereby creating brighter star images. Connecting the two spheres was a framework that held nearly 150 individual projectors, including those dedicated to the planets, the Sun, and specific stars.Įach globe held representations of almost 4,500 stars per hemisphere. This model of Zeiss projector was a 13-foot (4.0 m)-long dumbbell-shaped object, with 29-inch (740 mm)-diameter spheres attached at each end representing the night sky for the northern and southern hemispheres. ![]() The OMNIMAX movie system (now known as IMAX Dome) was originally designed to operate on planetarium screens.Ĭompanies that make (or have made) planetarium projectors include Carl Zeiss Jena (Germany), Spitz (US), Goto and Minolta (Japan), Evans & Sutherland (US), Emerald planetariums (Israel) and Ohira Tech (Japan).ġ960s Zeiss-Jena Universal Projection Planetarium Type 23/6 1 - Constellation Figure Projector (North) 2 - Star Globe (North) 3 - Mechanical shutter of star field projector 4 - Milky Way projector (North) 5 - Planetary projectors (North) 6 - Lattice ring for Sun, Moon and Vertical circle projectors 7 - Horizon circle projector 8 - Planetary projectors (South) 9 - Star Globe (South) 10 - Compass point projectorĪ good example of a "typical" planetarium projector of the 1960s was the Universal Projection Planetarium type 23/6, made by VEB Carl Zeiss Jena in what was then East Germany. Still others add coordinate lines and constellations, photographic slides, laser displays, and other images. Additional projectors can be added to show twilight around the outside of the screen (complete with city or country scenes) as well as the Milky Way. Larger machines also include comets and a far greater selection of stars. Smaller projectors include a set of fixed stars, Sun, Moon, and planets, and various nebulae. Modern planetarium projectors were first designed and built by the Carl Zeiss Jena company in Germany between 19, and have since grown more complex. JSTOR ( June 2020) ( Learn how and when to remove this template message)Ī Zeiss Universarium Mark IX starball projectorĪ planetarium projector, also known as a star projector, is a device used to project images of celestial objects onto the dome in a planetarium.Unsourced material may be challenged and removed.įind sources: "Planetarium projector" – news ![]() Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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