When Du Fu wrote "Remembering My Brother" on a moonlit night, which of the following traditional solar terms happened?

"He knows the dew will be frost tonight" not only describes the scenery, but also points out the season. It was on the night of the Millennium Festival. It's clear and full of dew, which makes people feel chilly. "

Recalling Brothers on a Moonlit Night is a five-character poem written by Du Fu, a great poet in the Tang Dynasty. The poem's first couplet and couplet are scenes, which set off the atmosphere of war. On this basis, the two brothers, the Neck Couplet and the Tail Couplet, were separated because of the war, living without a fixed place and no news, so the feeling of missing came to life, especially in the autumn dew season, against the backdrop of drums upstairs and the howling of lonely geese, this feeling of missing became deeper and stronger. The whole poem is extremely contradictory, coherent, coordinated from beginning to end, comprehensive in content, rigorous in structure, delicate in language, gloomy and sad in style, sincere and touching.