if the moon is a full moon tonight what will be the moon one week later waxing or waning

-- Starting from nothing (New Moon), the moon's shape grows ('waxes') for half of the cycle, until it's full, and then it shrinks ('wanes') for the next half of the cycle.-- The moon's complete cycle of phases runs 29.53 days . . . roughly four weeks.-- So, beginning from New Moon, it spends about two weeks waxing until it's full, and then another two weeks waning until it's all gone again.  -- After a Full Moon, the moon is waning for the next two weeks.  So it'sdefinitely waning at one week after Full.