十じゅう五ご夜や

noun

night of the full moon; 15th night of the 8th lunar month

Refers specifically to the full-moon night of the 15th day of the 8th lunar month (around mid-September), a traditional moon-viewing festival. Often associated with offering susuki grass and dango.

• 今年ことしの十じゅう五ご夜やは九く月がつ十じゅう五ご日にちです。

  This year's harvest moon night is on September 15th.

• 十じゅう五ご夜やにはすすきを飾かざります。

  We decorate with pampas grass on the night of the full moon.