Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An apparatus or model representing the solar system.
  • n. An optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome.
  • n. A building or room containing a planetarium, with seats for an audience.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A display museum in which images of stars and other astronomical phenomena are projected onto a domed ceiling.
  • n. An orrery.

from the GNU version of the Collaborative International Dictionary of English

  • n. An orrery. See orrery.

from The Century Dictionary and Cyclopedia

  • n. An astronomical machine which, by the movement of its parts, represents the motions and orbits of the planets. See orrery.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an apparatus or model for representing the solar systems
  • n. an optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome
  • n. a building housing an instrument for projecting the positions of the planets onto a domed ceiling

Etymologies

From New Latin, formed from planet +‎ -arium. (Wiktionary)

Examples

  • So you wonder who actually wrote that bit, when a planetarium is an excellent example of exciting science education for students, yet it's dismissed so casually more than once.

    Archive 2008-10-10

  • (In homage to Nehru's interest in astronomy, the city's planetarium is next door.) 12: 10 A.M. INDIRA GANDHI

    City Walk: New Delhi

  • I'm sorry, did he call a planetarium "foolishness"?

    Bad Astronomy

  • The Gottorp Globe, the world’s first modern planetarium, is completed in Germany.

    Boing Boing

  • Mason's trip to the planetarium was a big success.

    Day in the Life of an Idiot

  • Outside the planetarium were a number of science exhibits, including an environmental-themed multimedia presentation.

    Thursday, April 23 – The Bleat.

  • Now celebrating its 75th anniversary, the planetarium was the first built in the Western hemisphere, and the first with a Zeiss, an optical projection device creating the illusion of a night sky.

    CNN Transcript Oct 22, 2004

  • Now, Hodge reports, the school has added a number of classrooms, an audiovisual room, computer lab, and even a planetarium, which is named for his wife, Marlene, a longtime champion of Project Nino who died in 2004.

    Home

  • Of course our planetarium is a fraction of the cost the structure itself is very expensive needless to say the projector.

    digg.com: Stories / Popular

  • McCain's "overhead projector" is the apparatus that runs the planetarium, which is a bit like calling the Palomar Observatory a new set of glasses.

    Grist - the Latest from Grist

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