The full moon: the phase when the moon is fully illuminated and appears round and bright in the night sky.
今夜は満月だから、月がとても明るい。
Tonight is a full moon, so the moon is very bright.
満月の夜に散歩するのが好きだ。
I like taking walks on nights with a full moon.
満月は潮の干満にも影響を与えると言われている。
It's said that the full moon affects the tides.