Declension of the word "Observatorium"

Singular and plural for Observatorium, n, mixed declension     translation to English observatory

Singular
Plural
Singular
Nominativ (Wer? Was?)
das Observatorium
die Observatorien
Genitiv (Wessen?)
des Observatoriums
der Observatorien
Dativ (Wem?)
dem Observatorium
den Observatorien
Akkusativ (Wen? Was?)
das Observatorium
die Observatorien
Plural
die Observatorien
der Observatorien
den Observatorien
die Observatorien
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