"dumbbell" design similar to the Mark II-VI projectors, where two smaller starballs for the northern and southern hemispheres are connected by a truss containing projectors for planets and other moving objects. List of planetariums that have featured a Zeiss projector Between 1923 and 2011, Zeiss manufactured a total of 631 projectors. Therefore, the following table is highly incomplete. See also List of planetariums Planetarium Planetarium Jena Walther Bauersfeld References External links Zeiss Planetariums Planetarium projection Carl Zeiss AG