Meanings
Usage patterns
月が出るthe moon comes out / rises
The moon came out from behind the mountains.
月に〈数〉回... times a month
I go back to my parents' house twice a month.
月が明るいthe moon is bright / it's a bright moonlit night
The moon is so bright tonight that you can't see the stars well.
月が満ちるthe moon becomes full / waxes
The moon is full tonight.
〈数〉ヶ月かかるto take ... months
This construction is expected to take three months.