YOU SAID:
"once in a blue moon"
INTO JAPANESE
「青い月に一度」
BACK INTO ENGLISH
"Once in the blue moon"
INTO JAPANESE
「一度青い月に」
BACK INTO ENGLISH
Once in the blue moon
INTO JAPANESE
一度青い月に
BACK INTO ENGLISH
Once in the blue moon
That didn't even make that much sense in English.