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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.
A dominant feature of most planetariums is the large dome-shaped projection screen onto which scenes of stars, planets, and other celestial objects can be made to appear and move realistically to simulate their motion. The projection can be created in various ways, such as a star ball, slide projector, video, fulldome projector systems, and lasers.
The ceiling projector or cloud searchlight is used to measure the height of the base of clouds (called the ceiling) above the ground. It is used in conjunction with an alidade, usually positioned 1000 ft (300 m) away and wherever possible set at the same level. The projector is normally set at 90°, although 71° 31' may be used, in relation to ...
Star-painted vaulting over the apse of St. Mary's Basilica, Kraków, Poland. A starry vault over the chancel of Carlisle Cathedral in Cumbria in northern England.. A ceiling painted with stars frequently occurs as a design motif in a cathedral or Christian church, and replicates the Earth's sky at night. [1]
[b] [10] With a magnitude of 3.5, Alpha Telescopii is the brightest star in the constellation. It is a blue-white subgiant of spectral type B3IV which lies around 250 light-years away. [ 12 ] It is radiating nearly 800 times the Sun's luminosity , and is estimated to be 5.2±0.4 times as massive and have 3.3±0.5 times the Sun's radius. [ 13 ]
"Identification of a Constellation from a Position" Gould, B. A. "Uranometria Argentina". Reprinted and updated by Pilcher, F. Archived from the original on 2012-02-27 "AAVSO Website". American Association of Variable Star Observers
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