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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]
In 1921, Joel Stebbins announced that observations from 1917 through 1921 had shown that the star is an eclipsing binary. [14] AR Cassiopeiae A is an Algol-type eclipsing binary with an orbital period of about 6.07 days. [4] Its primary is a B-type main-sequence star, and the secondary an A-type main-sequence star. The secondary star may be an ...
This is a list of star systems within 100–150 light years of Earth. This list is incomplete; you can help by adding missing items. (July 2024) Star system ...
Light redirected by these systems does not converge to a focal point or form an image, [1] hence the name (from an, without, and eidolon, image [2]). Anidolic lighting uses non-imaging mirrors, lenses, and light guides to capture exterior sunlight and direct it deeply into rooms, while also scattering rays to avoid glare.
The newest generation of planetariums such as Evans & Sutherland's Digistar 7, Global Immersion's Fidelity or Sky-Skan's DigitalSky Dark Matter, offer a fully digital projection system, in which a single projector with a fish eye lens, or a system of digital video or laser video projectors around the edge of the dome, are used to create any ...
A multiple star system consists of two or more stars that appear from Earth to be close to one another in the sky. [dubious – discuss] This may result from the stars actually being physically close and gravitationally bound to each other, in which case it is a physical multiple star, or this closeness may be merely apparent, in which case it is an optical multiple star [a] Physical multiple ...
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