• Entry
  • Reader's guide
  • Entries A-Z
  • Subject index

A planetarium is a device for artificially depicting the night sky, showing the relative positions and motions of the sun, moon, and planets. Modern planetariums are theaters, usually dome shaped, that employ elaborate equipment, including projector systems and lasers, for ...

    • Loading...
    locked icon

    Sign in to access this content

    Get a 30 day FREE TRIAL

    • Watch videos from a variety of sources bringing classroom topics to life
    • Read modern, diverse business cases
    • Explore hundreds of books and reference titles