1) Christiaan Huygens invented the first practical pendulum clock in 1656, building on Galileo Galilei's earlier observations and discovery 2) He was inspired by the earlier work of Galileo Galilei 3) Galileo Galilei was a renowned Italian astronomer, physicist, and engineer, often referred to as the "father of modern science". 4) Galileo observed a swinging lamp in a church and used his pulse to measure time, noticing that the lamp's swing time remained constant. 5) After testing different pendulums, Galileo discovered that the time for one complete swing stayed the same for a pendulum of a fixed length. 6) Huygens applied Galileo's principles to invent the first working pendulum clock in 1656 7) He patented the device the following year, in 1657. 8) The introduction of the pendulum mechanism revolutionized timekeeping, increasing the accuracy of clocks

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