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1. Ancient Timekeeping

   Linked via "Karnak Temple complex"

   The clepsydra, or water clock, was widely employed across Mesopotamia, Egypt, and later Greece. These devices operated on the principle of controlled water outflow. The rate of flow was determined by the hydrostatic head pressure, meaning the flow slowed as the water level dropped.
   Early Egyptian outflow clepsydrae, such as those found in the Karnak Temple complex (c. 1400 …