Cable crossing: Planetariums turn one hundred years old

Cable crossing 36 (May 10, 2025) Planetariums are one hundred years old [~17:40] – This past Wednesday marked one hundred years of the first public session of a planetarium. It took place on May 9, 1925 at the Deutsches Museum in Munich. We have talked a little bit about the wonder that mechanical projectors are, although in recent years many planetariums of the world have incorporated digital projectors that allow to do unthinkable things not l…