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Water clocks are one of the oldest time-measuring instruments. [2] In ancient China, as well as throughout East Asia, water clocks were very important in the study of astronomy and astrology. The oldest written reference dates the use of the water clock in China to the 6th century BC. [3]
[2] kè literally means "mark" or "engraving", referring to the marks placed on sundials [4] or water clocks [5] to help keep time. Using the definition of kè as 1 ⁄ 100 of a day, each kè is equal to 0.24 hours, 14.4 minutes, or 14 minutes 24 seconds. Every shí contains 8 1 ⁄ 3 kè, with 7 or 8 full kè and partial beginning or ending kè.
Sundials and water clocks were first used in ancient Egypt c. 1200 BC (or equally acceptable BCE) and later by the Babylonians, the Greeks and the Chinese. Incense clocks were being used in China by the 6th century. In the medieval period, Islamic water clocks were unrivalled in their sophistication until the mid-14th century.
A water clock or clepsydra (from Ancient Greek κλεψύδρα (klepsúdra) 'pipette, water clock'; from κλέπτω (kléptō) 'to steal' and ὕδωρ (hydor) 'water'; lit. ' water thief ' ) is a timepiece by which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel, and where the amount ...
The incense clock (simplified Chinese: 香钟; traditional Chinese: 香鐘; pinyin: xiāngzhōng; Wade–Giles: hsiang-chung; lit. 'fragrance clock') is a timekeeping device that originated from China during the Song dynasty (960–1279) and spread to neighboring East Asian countries such as Japan and Korea.
Korean Water Clocks: Jagyongnu, The Striking Clepsydra and The History of Control and Instrumentation Engineering (in Korean). Seoul: Konkuk University Press. Seoul: Konkuk University Press. Nam, Moon-Hyon (1998).
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A Chinese printed playing card dated c. 1400 AD, Ming dynasty, found near Turpan, measuring 9.5 by 3.5 cm. Playing cards may have been invented during the Tang dynasty around the ninth century AD as a result of the usage of woodblock printing technology.