Photo taken on Oct 4, 2017 shows the moon during the Mid-Autumn Festival in Longli county, Southwest China's Guizhou province. [Photo/Xinhua]

Chinese are celebrating Mid-Autumn Festival on September 24 this year - an annual festival that falls on the 15th day of the eighth month of the Chinese lunar calendar.

Traditionally a harvest festival to worship the moon, Mid-Autumn Festival, also known as the Moon Festival, has developed into a day for families to gather for a reunion.

People across China will enjoy a three-day holiday, with many packing their bags and traveling long distances to reunite with their families. To celebrate the day, they will share mooncakes, which are traditional festive Chinese pastries, and gaze at the full moon, if weather permits.

What are the festival's origins? Over the centuries, there have been different versions of the folklore behind it. Among them, the story of Chang'e is the most widely known.