Full coverage: Chinese Mid-Autumn Festival
The moon is usually round and bright on this night. And the word for 'round' in Chinese, is a homonym for the Chinese word "unity". It is an extra meaningful time for families to get together, and people who work away from home will try to come back home.
What you're seeing now is earlier footage of the moon as seen from different cities across the country. The Mid-Autumn Festival, dates back to thousands of years, and is also considered as a day of harvest, as fruits, vegetables and grain are usually reaped during this period.