Earth shouldn't alone make the value of g=9.81m/sec^2. There is the moon, all the planets and our sun (ignoring the outstanding multitude of outer space for my simplicity) and all of these bodies must have some influence on everything that's on Earth. So if we want to find the real acceleration due to gravity on Earth, wouldn't we have to find the net acceleration after taking into account all these sources of gravity that are trying to pull me toward their respective selves?
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