1 year is equal to 12 months & a complete revolution / orbit of the earth around the sun takes 1 / one year / solar year / earth year ->  a complete revolution of earth around the sun takes 12 months  a complete revolution of earth around the sun takes 12 months & a complete revolution / orbit of the moon around the earth takes 1 / one month -> the moon will have 12 complete revolutions around the earth after a complete revolution of earth around the sun