The Mid-Autumn Festival falls on the 15th day of the 8th lunar month, usually in October in Gregorian calendar.
每年農歷八月十五日，是傳統的中秋佳節。這時是一年秋季的中期，所以被稱為中秋。

The festival has a long history. In ancient China, emperors followed the rite of offering sacrifices to the sun in spring and to the moon in autumn. Historical books of the Zhou Dynasty had had the word "Mid-Autumn". Later aristocrats and literary figures helped expand the ceremony to common people. They enjoyed the full, bright moon on that day, worshipped it and expressed their thoughts and feelings under it. By the Tang Dynasty (618-907), the Mid-Autumn Festival had been fixed, which became even grander in the Song Dynasty (960-1279). In the Ming (1368-1644) and Qing (1644-1911) dynasties, it grew to be a major festival of China.
　中秋節有悠久的歷史，和其它傳統節日一樣，也是慢慢發展形成的，古代帝王有春天祭日，秋天祭月的禮制，早在《周禮》一書中，已有“中秋”一詞的記載。后來貴族和文人學士也仿效起來，在中秋時節，對著天上又亮又圓一輪皓月，觀賞祭拜，寄托情懷，這種習俗就這樣傳到民間，形成一個傳統的活動，一直到了唐代，這種祭月的風俗更為人們重視，中秋節才成為固定的節日，《唐書·太宗記》記載有“八月十五中秋節”，這個節日盛行于宋朝，至明清時，已與元旦齊名，成為我國的主要節日之一。

Folklore about the origin of the festival go like this: In remote antiquity, there were ten suns rising in the sky, which scorched all crops and drove people into dire poverty. A hero named Hou Yi was much worried about this, he ascended to the top of the Kunlun Mountain and, directing his superhuman strength to full extent, drew his extraordinary bow and shot down the nine superfluous suns one after another. He also ordered the last sun to rise and set according to time. For this reason, he was respected and loved by the people and lots of people of ideals and integrity came to him to learn martial arts from him. A person named Peng Meng lurked in them.
　相傳，遠古時候天上有十日同時出現，曬得莊稼枯死，民不聊生，一個名叫后羿的英雄，力大無窮，他同情受苦的百姓，登上昆侖山頂，運足神力，拉開神弓，一氣射下九個多太陽，并嚴令最后一個太陽按時起落，為民造福。后羿因此受到百姓的尊敬和愛戴，不少志士慕名前來投師學藝，心術不正的蓬蒙也混了進來。