A planetarium

* The plural of planetarium can be either planetariums or planetaria.
* The term planetarium is sometimes used generically to describe other devices which illustrate the solar system, such as a computer simulation or an orrery.
* The term planetarian is used to describe a member of the professional staff of a planetarium.
* Planetarium software refers to a software application that renders a three dimensional image of the sky onto a two dimensional computer screen.

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