<P> The first Zeiss Mark I projector ( the first planetarium projector in the world ) was installed in the Deutsches Museum in Munich in August , 1923 . It possessed a distinctive appearance , with a single sphere of projection lenses supported above a large , angled `` planet cage '' . Marks II through VI were similar in appearance , using two spheres of star projectors separated along a central axis that contained projectors for the planets . Beginning with Mark VII , the central axis was eliminated and the two spheres were merged into a single , egg - shaped projection unit . </P>
<P> The first Zeiss Mark I projector ( the first planetarium projector in the world ) was installed in the Deutsches Museum in Munich in August , 1923 . It possessed a distinctive appearance , with a single sphere of projection lenses supported above a large , angled `` planet cage '' . Marks II through VI were similar in appearance , using two spheres of star projectors separated along a central axis that contained projectors for the planets . Beginning with Mark VII , the central axis was eliminated and the two spheres were merged into a single , egg - shaped projection unit . </P>
in which city was the world 's first planetarium projector installed in 1923
in which city was the world 's first planetarium projector installed in 1923
Munich
Munich