Yes, it's perfect, including the ambiguity of "silently". Because of the position of this adverb, it's possible to interpret that "silently" modifies both "wanes" (my moon wanes silently) and "live" (Silently, I live a winter night = I silently live a winter night), as same as in the Japanese version, where the two interpretations しんしんと欠ける and しんしんと生く are both possible.