it can be used to provide accurate Time-keeping

grandfather clock
note: today we use atomic vibrations for the most accurate clocks.
2 it can be used to measure "g"(the acceleration due to gravity) which is important in determining the shape of the earth and the distribution of materials within it (the science of geodesy)
the pendulum helps scientists determine "g" force which is affected by:
1) distance from center of earth
2) masses attracting upwards (ie. mountains)
3) density of matter around you

and also it can be used to show that the Earth Spins

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