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Apr 18, 1581
Pendelum
Galileo invented the pendelum.http://www.mce.k12tn.net/renaissance/inventions.htm -
Pendelum clock
In 1665, a Dutch scientist named Christiaan Huygens was the first person to create a clock using a pendulum. http://www.bukisa.com/articles/34123_the-history-of-the-pendulum -
improving the pendelum clock
In 1721, George Graham improved the pendulum clock's accuracy to 1 second a day by compensating for changes in the pendulum's length due to temperature variations -
pendelum current day
