The stars have a slight gravitational pull. Some locations on earth are at a higher altitude than others, bringing the observers closer or farther from the stars. This explains why 'gravity' is less on the summit of Mt. Everest than it is in Death Valley.
In fact, it was Issac Newton who commented that this was a most serious unsatisfactory tenet of gravity. According to theory, the masses of the largest mountain ranges of the world should cause grater gravity in the Mt. Everest area. But this is not the case at all. A gravimeter does not show that gravity gets stronger when you simply bring it by a mountain. Gravitational differences are strongly correlated with the altitude of the measuring device.
Also, don't bother linking that gnome weight measuring experiment showing that different spots on earth have different levels of g. We've seen it a million times. Besides that this incredibly sensitive experiment is totally uncontrolled in inside and outside conditions, those locations are at different altitudes from each other, and therefore, different levels of g are to be expected.