The astronomical clock, invented by the Chinese scientist Su Song over 800 years ago, was the first of its kind in the world. It gave the correct time of the day and night, as well as the sunrise and the sunset.

• 中国科学家苏颂800多年前发明的天文钟是世界上最早的天文钟。 它能自动报告昼夜时刻和日出、日落等情况。