Who invented timekeeping?

ACCORDING TO archaeological evidence, the Babylonians and Egyptians began to measure time at least 5,000 years ago, introducing calendars to organize and coordinate communal activities and public events, to schedule the shipment of goods and, in particular, to regulate cycles of planting and harvesting.

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How old are grandfather clocks?

Is a longer pendulum more accurate? With most spring driven clocks, accuracy can vary over the course of a week as the spring gradually weakens. A longer pendulum will cause the clock to run slower because this will increase the length of the arc of swing.

And another question, what does ra mean on a clock pendulum?

The R A on the pendulum stands for: retard/advance. It is a common pendulum bob, used by many manufacturers, worldwide. As a rule of thumb, the thread on rating nut is designed so that one full turn changes the clock about 2 minutes per week. What is the most accurate pendulum clock? Burgess Clock B Burgess Clock B, The World's Most Precise Pendulum Clock, Is Made To A 250-Year-Old Design By John Harrison, Longitude Prize Winner And Inventor Of The Marine Chronometer. In 2015, Guinness World Records presented an unusual award at the National Maritime Museum in Greenwich (the "G" in "GMT"), England.