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(in the sense that it does not point to the centre of mass of the Earth). The change in plumb-line angle against a known object--such as a star--could be carefully measured on opposite sides of the mountain. If the mass of the mountain could be independently established from a determination of its volume and an estimate of the mean density of its rocks, then these values could be extrapolated to provide the mean density of the Earth, and by extension, its mass.

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