the world's first planetarium projector was installed in 1923 in the city of yokohama.
in which city was the world's first planetarium projector installed in 1923?
yokohama
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.





















































section::::history of development and production.
zeiss projector
during the late 1930s, armand spitz, a part-time lecturer at "the fels planetarium " of the franklin institute in philadelphia, had started developing his own projector for the planetarium. however, while designing an inexpensive planetarium projector, spitz realized the difficulties involving the icosahedron shaped projector globe. he approached albert einstein for a solution. following einstein's suggestion, spitz used a dodecahedron and managed to produce an inexpensive planetarium projector. this planetarium is believed to be the only planetarium in the world that is running its shows with this projector for more than sixty years.





















































section::::suspension and later resumption of operation.
kusumbai motichand planetarium