First thing I thought too! But I guess it's a different definition of planetarium. Wikipedia has even older mentions of planetarium, but does cite the one in F

First thing I thought too! But I guess it's a different definition of planetarium. Wikipedia has even older mentions of planetarium, but does cite the one in Franeker as the oldest still working: https://en.wikipedia.org/wiki/Planetarium https://en.wikipedia.org/wiki/Planetarium