The Mid-Autumn Festival falls on the 15th day of the 8th lunar month, usually in October in Gregorian calendar.
每年农历八月十五日，是传统的中秋佳节。这时是一年秋季的中期，所以被称为中秋。

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.
　中秋节有悠久的历史，和其它传统节日一样，也是慢慢发展形成的，古代帝王有春天祭日，秋天祭月的礼制，早在《周礼》一书中，已有“中秋”一词的记载。后来贵族和文人学士也仿效起来，在中秋时节，对着天上又亮又圆一轮皓月，观赏祭拜，寄托情怀，这种习俗就这样传到民间，形成一个传统的活动，一直到了唐代，这种祭月的风俗更为人们重视，中秋节才成为固定的节日，《唐书·太宗记》记载有“八月十五中秋节”，这个节日盛行于宋朝，至明清时，已与元旦齐名，成为我国的主要节日之一。

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.
　相传，远古时候天上有十日同时出现，晒得庄稼枯死，民不聊生，一个名叫后羿的英雄，力大无穷，他同情受苦的百姓，登上昆仑山顶，运足神力，拉开神弓，一气射下九个多太阳，并严令最后一个太阳按时起落，为民造福。后羿因此受到百姓的尊敬和爱戴，不少志士慕名前来投师学艺，心术不正的蓬蒙也混了进来。