How did hourglass happen? How did they even get the right amount/size of each sand particle/other physical aspects to be aligned with the time?
In: Physics
They calibrated them against sundials which are pretty accurate and can be constructed anywhere. A sundial uses the movements of a shadow across the floor to measure time. An hourglass is more convenient in that it is portable. They also used various other portable devices, like candle clocks and water clocks etc., all ultimately calibrated and verified against a stationary sundial.
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