Summary
Global variations in gravity caused by the general variation in the mass distribution of the Earth can be investigated by measuring gravity differences around the Earth. When the gravity differences to be measured are small and special arrangements are applied, the gravity differences can be measured with an accuracy of some microgals. Measurement of this kind needs effective and extensive international cooperation.
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References
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Kiviniemi, A. A method for studying global gravity variations. Bull. Geodesique 116, 177–181 (1975). https://doi.org/10.1007/BF02521527
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DOI: https://doi.org/10.1007/BF02521527