Board Thread:General Discussion/@comment-6192846-20150223174230/@comment-69.150.209.129-20150322220227

I took four years of French, and I concur. "Lune" is feminine and "du" must precede a masculine term. "Cirque de la Lune" would be the most correct phrase here. You might be able to get away with "Cirque de Lune" though.