“Ah, pray make no mistake, / We are not shy. / We’re very wide awake, / The moon and I.” So sings Yum-Yum in Gilbert and Sullivan’s The Mikado. And so sings the exhibition “The Moon,” which is very wide awake to the lunar presence in art both old and new, eastern and western. A 50th-anniversary celebration of man’s first step on the moon’s surface. —L.J.