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A planetarium projector, also known as a star projector, is a device used to project images of celestial objects onto the dome in a planetarium. Modern planetarium projectors were first designed and built by the Carl Zeiss Jena company in Germany between 1923 and 1925, and have since grown more complex.
Digistar is the first computer graphics-based planetarium projection and content system.It was designed by Evans & Sutherland and released in 1983. The technology originally focused on accurate and high quality display of stars, including for the first time showing stars from points of view other than Earth's surface, travelling through the stars, and accurately showing celestial bodies from ...
Stars and planets were projected onto a negative pressure screen inside the dome by a Carl Zeiss ZKP4 star projector. This enabled visitors to gaze at the stars in a projection of the sky without the hindrance of light pollution and cloud cover while they lay on comfortable mats or deck chairs.
Smaller planetarium projectors include a set of fixed stars, Sun, Moon, and planets, and various nebulae. Larger projectors also include comets and a far greater selection of stars. 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.
First Evans & Sutherland Digistar I calligraphic scan (projection of light points and lines – also known as a vector scan) planetarium projector at the Science Museum of Virginia in Richmond, Virginia, United States. 1995: First Evans & Sutherland Digistar II calligraphic scan planetarium projector opens at the London Planetarium, UK. 1996
The device enhances ambient visible light and converts near-infrared light into visible light which can then be seen by humans; this is known as I 2 (image intensification). By comparison, viewing of infrared thermal radiation is referred to as thermal imaging and operates in a different section of the infrared spectrum.