"The big globe is fixed, a variety of small projection devices are dis-posed on its centre and the globe's white interior surface serves as the projection face. The opposing position and move-ment of these small projectors are directed by an appropriate transmission in a way that the images of the celestial objects projected at the fixed surface of the hemisphere by the projection apparatuses reflect the situation and movement of stars as they are visible to the naked eye outside in nature." These words briefly explain the principle of Bauerfeld's projection planetarium. Concerning the word "plane-tarium" - it contains the original meaning which is the comparatively modest concern at the beginning of the era to show the stars' movement in the earth's sky.

The dream became true on 21 October, 1923 in Munich: a first nonpublic performance was shown to experts. Only in May, 1925 the first planetarium projector for public performances was put into operation in Munich. A year later on 18 July, 1926 the Zeiss-Planetarium-Jena was opened. Today's oldest working planetarium was designed by the architects Hans Schlag (1890 - 1970) and Johannes Schreiter (1872 - 1957) and built by the reknown cons-truction firm Dyckerhoff & Widmann. The cupola is made of an inte-resting patented ferro-concrete construction: nearly 8000 iron bars of different lengths form a network which is covered with a six centi-metre layer of con-crete. The construction has a diametre of 23 metres and a height of 14,5 metres. Expressionist elements of style decorate the interior. The whole architectural ensemble is classified as a historical monument.

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