天てん文もん館かんMeanings1nounplanetariumRefers to a facility or building with a planetarium, often used in proper names like 鹿児島市の天文館.See also: プラネタリウム週しゅう末まつに子こ供どもを連つれて天てん文もん館かんへ行いった。I took my child to the planetarium on the weekend.