@cosmos4u@scicomm.xyz2026-07-18 07:55:57
100 years ago #OTD the #planetarium in #Jena (Germany) opened to the public: it's the oldest one in the world srill operating in the same location! Scroll down on https://skyweek.wordpress.com/2026/07/18/die-leuchtenden-nachtwolken-sind-weiter-aktiv for some news coverage back then and the wider context.
