Tsukimi - Moon viewing party
As the year progresses the length of days changes. Days are longer in the summer and shorter in the winter. In the winter the full moon rises after the sun has set. In the summer, the full moon rises before the sun has set. At the equinoxes, the days and nights are exactly the same length. Consequently, the moon is rising in the east at exactly the same time the sun is setting in the west.