既き望ぼう

noun

16th night of the lunar month

A classical term from the lunar calendar, referring to the night after the full moon (望月). Used in historical, poetic, or literary contexts.

• 旧きゅう暦れきでは、満まん月げつの翌よく日じつを既き望ぼうと呼よんだ。

  In the old lunar calendar, the day after the full moon was called 既望.