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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.
Traditional planetarium projection apparatus use a hollow ball with a light inside, and a pinhole for each star, hence the name "star ball". With some of the brightest stars (e.g. Sirius, Canopus, Vega), the hole must be so big to let enough light through that there must be a small lens in the hole to focus the light to a sharp point on the ...
The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon. Natural light sources in a night sky include moonlight, starlight, and airglow, depending on location and timing. Aurorae light up the skies above the ...
The star system, located 3,000 light-years from Earth and typically too dim to be seen with the naked eye, is expected to reach a level of brightness similar to that of Polaris, or the North Star.
Equipment in the Buhl Planetarium included a Zeiss II Planetarium projector with 106 lenses capable of producing 9000 images of stars. [7] The projector was manufactured by the Zeiss Optical Works in Jena, Germany, at a cost of $135,000. The planetarium had a 492-seat “Theater of the Stars” with a 65-foot-diameter dome. [8]
The planets Venus, bottom, and Jupiter, top center, light the sky above Matthews, N.C., Monday, June 29, 2015. The two brightest planets appeared to be unusually close together. (AP Photo/Chuck ...
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