Though standard gravity is 9.80665 m/s2, it must vary from city to city, since the Earth is neither a perfect sphere nor of uniform composition. I'm looking for an experiment to accurately determine the value of g at my current location. The method needs to be precise enough to yield different values when performed in different places, for some value of "place." I think the minimum is to accurately obtain g to 3 decimal places. I've come up with the following unusable methods: Measure a very precise weight with a very precise scale (expensive) Measure the time it takes a standard weight to fall (imprecise) Use Wolfram Alpha (not interesting) Measure the friction between two surfaces with a known coefficient of friction (imprecise) Is there a way to use Newtonian physics to accurately find g without spending a lot of money?