From
苏轼《水调歌头·明月几时有》 (Su Shi, Northern Song, 1076):
明月几时有?
把酒问青天。
不知天上宫阙,
今夕是何年 (When did the bright moon first appear? Wine in hand, I ask the blue sky. I wonder what the palace halls of heaven are like - what year it is there tonight). Written during the Mid-Autumn Festival while missing his brother Su Zhe. The whole ci is arguably the single most famous poem about the moon in Chinese.