From Du Fu's
杜甫 《月夜忆舍弟》:
戍鼓断人行,
边秋一雁声。
露从今夜白,
月是故乡明. Written in 759 at Qinzhou, when the poet was scattered from his younger brothers during the An Lushan rebellion. 'Tonight' is the night of the White Dew
白露 solar term, one of the twenty-four solar terms.