Chinese New Year, Lantern Festival, Qingming Festival, Dragon Boat Festival, Qixi Festival, Mid-Autumn Festival and Double Ninth Festival are seven highly representative traditional festivals in China, which are closely linked to the ancient people's wisdom of observing celestial phenomena to tell time, adapting to farming seasons and upholding cultural beliefs. This special topic focuses on them, demonstrating the ancient people's understanding of astronomy and farming seasons, carrying the core of fine traditional Chinese culture, highlighting the wisdom of "harmony between man and nature", and enabling Chinese and foreign users to understand the Chinese people's time code and cultural roots.