Declension of the word "planetarium"

Singular and plural for Planetarium, n, mixed declension     translation to English planetarium

Singular
Plural
Singular
Nominativ (Wer? Was?)
das Planetarium
die Planetarien
Genitiv (Wessen?)
des Planetariums
der Planetarien
Dativ (Wem?)
dem Planetarium
den Planetarien
Akkusativ (Wen? Was?)
das Planetarium
die Planetarien
Plural
die Planetarien
der Planetarien
den Planetarien
die Planetarien
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