Emperor Tenji Introduces Water Clock in Japan

Emperor Tenji of Japan introduced the clepsydra, named Rokoku, which was a significant advancement in timekeeping. This water clock functioned by measuring the flow of water to indicate the hours of the day. It was strategically placed in the capital city of Ōtsu, reflecting the Emperor's interest in scientific innovation. The clepsydra represented a blend of art and technology that played an important role in governance and daily life.