Centennial: Projection Planetarium
Today (2023 October 21) marks the centennial of the planetarium projector, which made its debut at the Deutsches Museum in Munich, Germany on 1923 October 21. This means of displaying the motions of the Sun, Moon, planets, and stars of the sky, without any concern for inclement weather, quickly developed in cities around the world.
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Glenn A. Walsh, Informal Science Educator & Communicator,