Turn on the light time of Beijing Gulou

It is 17 in winter and 19 in summer. The lights of Beijing Drum Tower are turned off at 1 o'clock in winter, turned on at 17 in the evening, turned on at 19 in summer, and turned off at 2: 00 in the morning. The bell and drum tower on the central axis of Beijing lights up synchronously with the city night lighting. As the core point in the landscape of "lighting the central axis", the landscape of Bell and Drum Tower is "time and space flow".