Since there are variations of $g$ depending on location on Earth's surface, why not use a reproducible lab experiment using a vertical axis centrifugal balance, and say that one kg is defined by centrifugal force of $x$ atoms of silicon which center of mass is rotating at $y$ rpm, at a distance $R$ from the center?
closed as unclear what you're asking by sammy gerbil, stafusa, Kyle Kanos, Asher, Bill N Nov 14 '17 at 2:47
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Simple: the kilogram is not defined using Earth's gravity.
The kilogram is a measure of mass. Earths' gravity is only relevant when computing weight, which is a completely different concept.
There is a proposed redefinition of the kilogram in the works (which will get rid of the comparison to the IPK or any artifacts, and make the definition reproducible on any lab without the need for any reference materials) but neither the proposed new definition nor the existing one depend on Earth's gravity. (Or, when they do, this is measured and controlled for to remove that dependence.)