Time Observance Day

Time Observance Day

June 10
Emperor Tenchi (or Tenji) of Japan (626-671) is credited with making the first water clock, a device that measured time by the amount of water leaking out of a vessel. Because keeping track of time was not standard practice in the seventh century, the Japanese honor their 38th emperor on June 10, the day on which he first ordered the hour to be announced by sounding temple bells and drums.
The Rokoku Festival, or Water Clock Festival, is held on this day at the Omi Jingu Shrine in the city of Otsu, Shiga Prefecture, where the emperor's water clock is housed.
While placing so much emphasis on keeping track of the time may sound odd to Americans, it is important to remember that the Japanese were traditionally lax in such matters, often failing to announce the time when a meeting or function would begin because it depended on the readiness of the person in charge.
SOURCES:
BkFestHolWrld-1970, p. 97